{"id":5531,"date":"2026-10-15T14:18:57","date_gmt":"2026-10-15T06:18:57","guid":{"rendered":"https:\/\/tebaoflex-cable.com\/cases\/shielded-speaker-cable-2x2-5mm2-voice-evacuation-philippines\/"},"modified":"2026-10-20T16:13:08","modified_gmt":"2026-10-20T08:13:08","slug":"shielded-speaker-cable-2x2-5mm2-voice-evacuation-philippines","status":"publish","type":"page","link":"https:\/\/tebaoflex-cable.com\/de\/cases\/shielded-speaker-cable-2x2-5mm2-voice-evacuation-philippines\/","title":{"rendered":"Geschirmtes Lautsprecherkabel 2\u00d72.5 mm\u00b2 mit Kundenaufdruck, Philippinen"},"content":{"rendered":"\n<style>\n.tbf-case-pg{max-width:960px;margin-left:auto;margin-right:auto;--ink:#16202b;--muted:#5b6b7c;--line:#e2e8ee;--accent:#b4381f;--soft:#f6f8fa;color:var(--ink);line-height:1.7;font-size:17px}\n.tbf-case-pg h1{font-size:2rem;line-height:1.2;margin:0 0 .6rem}\n.tbf-case-pg h2{font-size:1.5rem;margin:2.4rem 0 .5rem;border-top:3px solid var(--ink);padding-top:.5rem}\n.tbf-case-pg 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1.1rem;margin:1.2rem 0;border-radius:0 8px 8px 0}\n.tbf-need ul{margin:.4rem 0 0;padding-left:1.1rem;columns:2;column-gap:2rem}\n.tbf-need li{margin:.2rem 0;break-inside:avoid}\n.tbf-rel ul{padding-left:1.1rem;columns:2;column-gap:2rem}\n.tbf-rel li{margin:.22rem 0;break-inside:avoid}\n.tbf-faq details{border-bottom:1px solid var(--line);padding:.8rem 0}\n.tbf-faq summary{cursor:pointer;font-weight:600}\n.tbf-faq p{margin:.55rem 0 0;color:var(--muted)}\n.tbf-cta{display:inline-block;background:var(--accent);color:#fff!important;text-decoration:none!important;border-radius:8px;padding:.6rem 1.15rem;font-weight:600;margin-top:.5rem}\n.tbf-byline{font-size:.92rem;color:var(--muted);background:var(--soft);border-radius:8px;padding:.85rem 1.1rem;margin:1.6rem 0}\n.tbf-back{font-size:.9rem;margin-top:2rem;padding-top:1rem;border-top:1px solid var(--line)}\n@media(max-width:640px){.tbf-shots{grid-template-columns:1fr}.tbf-need ul,.tbf-rel ul{columns:1}.tbf-case-pg th{width:auto}}\n.tbf-case-pg ul.tbf-list,.tbf-case-pg ol.tbf-list{padding-left:1.2rem;margin:0 0 1rem}.tbf-case-pg .tbf-list li{margin:.3rem 0}.tbf-case-pg .tbf-answer{font-size:1.04rem;border-left:3px solid #1f7a5c;padding:.1rem 0 .1rem .9rem}.tbf-case-pg .tbf-tw .tbf-wide th:first-child{position:sticky;left:0;background:#fff;z-index:1}.tbf-sys{width:100%;height:auto;display:block}.tbf-diag{margin:1.4rem 0}.tbf-diag ol{padding-left:1.4rem;font-size:.95rem;columns:2;column-gap:2rem}.tbf-diag li{margin:.2rem 0;break-inside:avoid}.tbf-diag figcaption{font-size:.85rem;color:var(--muted);margin-top:.4rem}.tbf-print{font-family:ui-monospace,Consolas,monospace;font-size:.92rem;background:#f4f6f8;padding:.5rem .7rem;border-radius:4px;overflow-wrap:anywhere}@media(max-width:640px){.tbf-shots{grid-template-columns:1fr}.tbf-shots img{height:auto}.tbf-diag ol{columns:1}}\n<\/style>\n<div class=\"tbf-case-pg\">\n<p class=\"tbf-kicker\">Project record \u00b7 Philippines \u00b7 Voice evacuation speaker circuits \u00b7 300\/500 V shielded PVC cable<\/p>\n<h1>Shielded 2&#215;2.5 mm\u00b2 PVC Speaker Cable with Customer Marking: a Voice Evacuation Enquiry from the Philippines<\/h1>\n<p class=\"tbf-lede\">An equipment supplier and engineering contractor in the Philippines asked for a fire-rated two-core speaker cable, 2 mm\u00b2, LSZH preferred, for the emergency voice evacuation system of a building project, and named Prysmian FP200 GOLD as the reference product. The order was placed as a 2&#215;2.5 mm\u00b2 shielded speaker cable rated 300\/500 V, with PVC insulation, a copper-wire braid screen and a PVC sheath (CU\/PVC\/CWB\/PVC), printed with the customer&#039;s own company name and the specification and packed in 200 m coils. TEBAOFLEX makes both constructions: the screened PVC cable supplied here and a fire-resistant two-core CU\/MICA\/XLPE\/OS\/LSZH cable, made to order against the circuit-integrity test an enquiry names. This record explains the difference and how a voice evacuation design decides which one a circuit needs.<\/p>\n<figure class=\"tbf-hero\"><img fetchpriority=\"high\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-speaker-cable-2x2-5mm2-voice-evacuation-philippines.webp\" alt=\"Cut end of the TEBAOFLEX 2\u00d72.5 mm\u00b2 300\/500 V screened cable held between two fingers: blue and brown PVC-insulated copper conductors, white fillers, the copper-wire braid screen and the black PVC sheath\" width=\"1200\" height=\"675\" fetchpriority=\"high\" decoding=\"async\"><figcaption>Cut end of the 2\u00d72.5 mm\u00b2 shielded cable: blue and brown PVC-insulated copper conductors, white fillers, the copper-wire braid and the black PVC sheath.<\/figcaption><\/figure>\n<h2>Project at a glance<\/h2>\n<div class=\"tbf-tw\"><table><tbody>\n<tr><th>Application<\/th><td>Speaker circuits of a building emergency voice evacuation (voice alarm) system, as stated in the enquiry; routes and pathway requirements set by the customer&#039;s design<\/td><\/tr>\n<tr><th>Customer<\/th><td>An equipment supplier and engineering contractor in the Philippines (not named)<\/td><\/tr>\n<tr><th>Enquiry<\/th><td>Fire-rated two-core speaker cable, 2 mm\u00b2, LSZH preferred; reference type FP200, a BS 7629-1 300\/500 V cable<\/td><\/tr>\n<tr><th>Cable supplied<\/th><td>2 \u00d7 2.5 mm\u00b2 copper conductors, PVC insulation (blue, brown), copper-wire braid screen, black PVC sheath, 300\/500 V: CU\/PVC\/CWB\/PVC; not a fire-resistant cable<\/td><\/tr>\n<tr><th>Marking<\/th><td>The customer&#039;s own company name, 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC and metre marks, signed off after a printing trial<\/td><\/tr>\n<tr><th>Packing<\/th><td>200 m coils in woven wrap with the TEBAOFLEX packing label, about 24 kg per coil as labelled<\/td><\/tr>\n<tr><th>Fire-resistant construction (to order)<\/th><td>Two-core CU\/MICA\/XLPE\/OS\/LSZH (mica-glass tape under XLPE insulation, overall screen, LSZH sheath), quoted only against a circuit-integrity test named in the enquiry; not supplied on this order<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<div class=\"tbf-scope\"><strong>Scope note.<\/strong> This case covers the cable and the specification decision behind it: what the enquiry asked for, what the reference specification means, what was supplied and where each construction belongs. TEBAOFLEX does not design voice alarm systems or install cables. The customer, its project, the quantities and the order value are not published.<\/div>\n<h2>What did the enquiry ask for, and what does the BS 7629-1 reference cable mean?<\/h2>\n<p class=\"tbf-answer\">The enquiry asked for a fire-rated two-core speaker cable, 2 mm\u00b2, LSZH preferred, and named FP200 as the reference type. FP200 GOLD is a Prysmian fire-resistant cable made to BS 7629-1, the British specification for 300\/500 V fire-resistant screened cables with low emission of smoke and corrosive gases. The customer was therefore asking for three properties at once: a cable that keeps the speaker circuit alive for a defined time in a fire, a sheath that gives off little smoke and no halogen acid gas, and a screened two-core construction.<\/p>\n<p>BS 7629-1 covers 300\/500 V screened cables with thermosetting insulation in three circuit-integrity categories, Standard 30, Standard 60 and Enhanced 120, assessed in fire tests with mechanical impact and water spray; a PVC-insulated cable is outside it by construction. The British fire alarm code, BS 5839-1, recommends that a &ldquo;standard&rdquo; fire-resisting cable meet the PH30 classification of BS EN 50200 and also survive the 30-minute BS EN 50200 Annex E test, in which water spray is added for the last 15 minutes; an &ldquo;enhanced&rdquo; cable meets PH120 and also survives 120 minutes in the BS 8434-2 test at 930 \u00b0C. The voice alarm code, BS 5839-8, applies the same two grades to loudspeaker circuits. A speaker cable in the Philippines is not bound by the British codes, but the enquiry used their vocabulary, and the grades are a useful way to say how long a circuit has to survive.<\/p>\n<p>The size was the first practical difference. 2.0 mm\u00b2 is not a size in IEC 60228, the conductor standard behind the 1.0, 1.5, 2.5 and 4 mm\u00b2 series used by BS 7629-1; it is close to 14 AWG (2.08 mm\u00b2), the size that speaker-wire catalogues often list. 2 \u00d7 2.0 mm\u00b2 is not a common size and few factories tool up for it, so the order was placed as 2 \u00d7 2.5 mm\u00b2, the next standard size, with a lower conductor resistance.<\/p>\n<div class=\"tbf-tw\"><table class=\"tbf-wide\"><thead><tr><th>Item<\/th><th>BS 7629-1 reference specification<\/th><th>TEBAOFLEX mica-tape construction (to order)<\/th><th>Order as supplied<\/th><\/tr><\/thead><tbody>\n<tr><th>Voltage rating<\/th><td>300\/500 V<\/td><td>300\/500 V<\/td><td>300\/500 V<\/td><\/tr>\n<tr><th>Conductors<\/th><td>1.0 to 4 mm\u00b2 copper<\/td><td>2 \u00d7 2.5 mm\u00b2 copper<\/td><td>2 \u00d7 2.5 mm\u00b2 copper<\/td><\/tr>\n<tr><th>Fire barrier<\/th><td>Part of the thermosetting insulation system<\/td><td>Mica-glass tape on each conductor<\/td><td>None<\/td><\/tr>\n<tr><th>Insulation<\/th><td>Thermosetting<\/td><td>XLPE over the mica tape<\/td><td>PVC<\/td><\/tr>\n<tr><th>Screen<\/th><td>Overall screen with a protective conductor<\/td><td>Overall screen: foil with drain wire, or braid<\/td><td>Copper-wire braid, about 80 % coverage<\/td><\/tr>\n<tr><th>Sheath<\/th><td>Low smoke zero halogen<\/td><td>LSZH<\/td><td>PVC, black<\/td><\/tr>\n<tr><th>Circuit integrity in a fire<\/th><td>Standard 30, Standard 60 or Enhanced 120 category<\/td><td>Quoted against a circuit-integrity test named in the order (IEC 60331 type); test evidence agreed per order<\/td><td>Not a fire-resistant cable<\/td><\/tr>\n<tr><th>Smoke and acid gas<\/th><td>Low smoke, halogen-free by specification<\/td><td>LSZH compounds specified to IEC 61034-2 and IEC 60754; test evidence agreed per order<\/td><td>PVC: smoke and hydrogen chloride when it burns<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>The first column is what fire alarm, voice alarm and emergency lighting circuits under BS 5839-1, BS 5839-8 and BS 5266-1 call for. The second is the construction TEBAOFLEX quotes for circuits specified as fire-resistant, against the test named in the order. The third is a screened speaker and control cable for circuits where survivability is provided by the raceway or the building, or is not required, and where the installation code allows a PVC cable on that route.<\/p>\n<h2>What was supplied: 2 \u00d7 2.5 mm\u00b2 CU\/PVC\/CWB\/PVC 300\/500 V shielded cable<\/h2>\n<p class=\"tbf-answer\">The cable the customer ordered is a two-core screened (shielded) cable: two 2.5 mm\u00b2 copper conductors with blue and brown PVC insulation, white fillers that keep the assembly round, a separator tape, a copper-wire braid screen of about 80 % coverage and a black PVC sheath, rated 300\/500 V. The packing label calls it a shielded control cable; the speaker line is the application. In Chinese control-cable vocabulary the construction corresponds to KVVP, or KVVRP with flexible conductors (rated 450\/750 V in GB\/T 9330; this order is rated and marked 300\/500 V), and in IEC vocabulary it is closest to the screened PVC control cables of IEC 60227-7; the cable was made to the construction in the order, not to either standard.<\/p>\n<figure class=\"tbf-diag\"><svg class=\"tbf-sys\" viewBox=\"0 0 760 350\" role=\"img\" aria-labelledby=\"xs13-t\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title id=\"xs13-t\">Cross-section of the 2\u00d72.5 mm\u00b2 shielded cable: two copper conductors with blue and brown PVC insulation, fillers, a separator tape, a copper-wire braid screen and a black PVC sheath<\/title><circle cx=\"230\" cy=\"175\" r=\"150\" fill=\"#1d1f22\" stroke=\"#000\" stroke-width=\"2\"\/><circle cx=\"230\" cy=\"175\" r=\"126\" fill=\"#d9a56a\" stroke=\"#8a4b17\" stroke-width=\"1\"\/><circle cx=\"230\" cy=\"175\" r=\"126\" fill=\"none\" stroke=\"#8a4b17\" 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cx=\"299.5\" cy=\"182.9\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"308.6\" cy=\"182.9\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"267.9\" cy=\"190.7\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"277.0\" cy=\"190.7\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"286.0\" cy=\"190.7\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"295.0\" cy=\"190.7\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"304.1\" cy=\"190.7\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"272.5\" cy=\"198.6\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"281.5\" cy=\"198.6\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"290.5\" cy=\"198.6\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><circle cx=\"299.5\" cy=\"198.6\" r=\"4.2\" fill=\"#c0702a\" stroke=\"#8a4b17\" stroke-width=\".4\"\/><line x1=\"174\" y1=\"175\" x2=\"40\" y2=\"60\" stroke=\"#16202b\" stroke-width=\"1.3\"\/><circle cx=\"174\" cy=\"175\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"40\" cy=\"60\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"40\" y=\"65\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">1<\/text><line x1=\"326\" y1=\"139\" x2=\"450\" y2=\"60\" stroke=\"#16202b\" stroke-width=\"1.3\"\/><circle cx=\"326\" cy=\"139\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"450\" cy=\"60\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"450\" y=\"65\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">2<\/text><line x1=\"326\" y1=\"215\" x2=\"450\" y2=\"120\" stroke=\"#16202b\" stroke-width=\"1.3\"\/><circle cx=\"326\" cy=\"215\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"450\" cy=\"120\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"450\" y=\"125\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">3<\/text><line x1=\"326\" y1=\"242\" x2=\"450\" y2=\"180\" stroke=\"#16202b\" stroke-width=\"1.3\"\/><circle cx=\"326\" cy=\"242\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"450\" cy=\"180\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"450\" y=\"185\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">4<\/text><line x1=\"314\" y1=\"269\" x2=\"450\" y2=\"240\" stroke=\"#16202b\" stroke-width=\"1.3\"\/><circle cx=\"314\" cy=\"269\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"450\" cy=\"240\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"450\" y=\"245\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">5<\/text><line x1=\"310\" y1=\"302\" x2=\"450\" y2=\"300\" stroke=\"#16202b\" stroke-width=\"1.3\"\/><circle cx=\"310\" cy=\"302\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"450\" cy=\"300\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"450\" y=\"305\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">6<\/text><\/svg><ol><li>Conductors: 2 \u00d7 2.5 mm\u00b2 copper (conductor class as stated in the order)<\/li><li>Insulation: PVC, blue and brown<\/li><li>Fillers that keep the two-core assembly round<\/li><li>Separator tape over the laid-up cores<\/li><li>Screen: copper-wire braid, about 80 % coverage<\/li><li>Sheath: black PVC, printed with the customer&#039;s own company name, 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC and metre marks<\/li><\/ol><figcaption>Schematic cross-section of the supplied cable, not to scale.<\/figcaption><\/figure>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-speaker-cable-2x2-5mm2-cut-end-copper-wire-braid.webp\" alt=\"Cut end of the 2\u00d72.5 mm\u00b2 screened cable: two stranded copper conductors with blue and brown PVC insulation, white fillers, the copper-wire braid screen and the black PVC sheath\" width=\"864\" height=\"845\" loading=\"lazy\" decoding=\"async\"><figcaption>A second cut sample: fine-stranded conductors in the blue and brown PVC cores, the white fillers and the copper-wire braid under the black sheath.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-cable-2x2-5mm2-300-500v-cu-pvc-cwb-pvc-sheath-print.webp\" alt=\"Coils of the black cable with the sheath print 300\/500V CU\/PVC\/CWB\/PVC 2x2.5mm\u00b2 and the metre marks\" width=\"756\" height=\"538\" loading=\"lazy\" decoding=\"async\"><figcaption>Coils of the finished cable with the sheath print: 300\/500V, CU\/PVC\/CWB\/PVC, 2&#215;2.5mm\u00b2 and the metre marks.<\/figcaption><\/figure>\n<\/div>\n<div class=\"tbf-tw\"><table><thead><tr><th>Item<\/th><th>This order<\/th><\/tr><\/thead><tbody>\n<tr><th>Construction code<\/th><td>CU\/PVC\/CWB\/PVC: copper conductor, PVC insulation, copper-wire braid, PVC sheath<\/td><\/tr>\n<tr><th>Voltage rating<\/th><td>300\/500 V<\/td><\/tr>\n<tr><th>Conductors<\/th><td>2 \u00d7 2.5 mm\u00b2 copper<\/td><\/tr>\n<tr><th>Conductor resistance, class 1 or 2 (IEC 60228 maximum)<\/th><td>At most 7.41 \u03a9\/km at 20 \u00b0C; reference value, not a measured result<\/td><\/tr>\n<tr><th>Conductor resistance, class 5 (IEC 60228 maximum)<\/th><td>At most 7.98 \u03a9\/km at 20 \u00b0C; reference value<\/td><\/tr>\n<tr><th>Insulation<\/th><td>PVC, blue and brown<\/td><\/tr>\n<tr><th>Screen<\/th><td>Copper-wire braid, about 80 % coverage, over a separator tape<\/td><\/tr>\n<tr><th>Sheath<\/th><td>Black PVC<\/td><\/tr>\n<tr><th>Marking<\/th><td>The customer&#039;s own company name, 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC, metre marks<\/td><\/tr>\n<tr><th>Packing<\/th><td>200 m coils, woven wrap, TEBAOFLEX packing label<\/td><\/tr>\n<tr><th>Weight<\/th><td>About 24 kg per 200 m coil as labelled (about 120 kg\/km)<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>The conductor figures come from <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/71891\" target=\"_blank\" rel=\"noopener\">IEC 60228<\/a>, which fixes the maximum resistance of each conductor class and size: 7.41 \u03a9\/km for a 2.5 mm\u00b2 class 1 or class 2 copper conductor and 7.98 \u03a9\/km for a class 5 flexible one, against 12.1 \u03a9\/km for 1.5 mm\u00b2. For a speaker line that resistance, doubled for the loop, is the number that sets the loss along the run, which is why the step from the requested 2.0 mm\u00b2 to 2.5 mm\u00b2 lowered the line loss rather than adding to it. The braid is a copper-wire braid rather than a foil because a braid keeps its coverage when the cable is bent and pulled through conduit and gives a low-resistance path to earth at the amplifier rack.<\/p>\n<h2>Is a fire-rated speaker cable the same as flame-retardant or LSZH? Three properties, three tests<\/h2>\n<p class=\"tbf-answer\">No. The supplied cable is a general-purpose PVC construction: it is not a fire-resistant cable, and PVC is neither low-smoke nor halogen-free. Each of the three fire properties a speaker cable can have is a separate test, and a specification has to name the ones it needs: flame retardance (IEC 60332-1-2), low smoke and zero halogen (IEC 61034-2 and IEC 60754) and circuit integrity in a fire (the IEC 60331 series, or BS EN 50200 and BS 8434-2 in the British grades).<\/p>\n<figure class=\"tbf-diag\"><svg class=\"tbf-sys\" viewBox=\"0 0 760 330\" role=\"img\" aria-labelledby=\"ld13-t\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title id=\"ld13-t\">Three separate fire properties of a cable, each with its own test: flame propagation along a single cable (IEC 60332-1-2), smoke density and halogen acid gas (IEC 61034-2 and IEC 60754), and circuit integrity under flame (IEC 60331, BS EN 50200, BS 8434-2)<\/title><rect x=\"20\" y=\"20\" width=\"220\" height=\"290\" rx=\"10\" fill=\"#f4f6f8\" stroke=\"#3b4652\" stroke-width=\"1.5\"\/><text x=\"148\" y=\"48\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">Flame-retardant cable<\/text><text x=\"130\" y=\"68\" text-anchor=\"middle\" font-size=\"11\" fill=\"#3b4652\">IEC 60332-1-2 (single cable)<\/text><text x=\"130\" y=\"294\" text-anchor=\"middle\" font-size=\"12\" fill=\"#16202b\">Does flame spread along it?<\/text><circle cx=\"42\" cy=\"42\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"42\" y=\"47\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">1<\/text><rect x=\"270\" y=\"20\" width=\"220\" height=\"290\" rx=\"10\" fill=\"#f4f6f8\" stroke=\"#3b4652\" stroke-width=\"1.5\"\/><text x=\"398\" y=\"48\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">Low smoke, zero halogen<\/text><text x=\"380\" y=\"68\" text-anchor=\"middle\" font-size=\"11\" fill=\"#3b4652\">IEC 61034-2 \u00b7 IEC 60754<\/text><text x=\"380\" y=\"294\" text-anchor=\"middle\" font-size=\"12\" fill=\"#16202b\">How much smoke and acid gas?<\/text><circle cx=\"292\" cy=\"42\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"292\" y=\"47\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">2<\/text><rect x=\"520\" y=\"20\" width=\"220\" height=\"290\" rx=\"10\" fill=\"#f4f6f8\" stroke=\"#3b4652\" stroke-width=\"1.5\"\/><text x=\"648\" y=\"48\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">Fire-resistant cable<\/text><text x=\"630\" y=\"68\" text-anchor=\"middle\" font-size=\"11\" fill=\"#3b4652\">IEC 60331 \u00b7 BS EN 50200<\/text><text x=\"630\" y=\"82\" text-anchor=\"middle\" font-size=\"11\" fill=\"#3b4652\">BS 8434-2 (circuit integrity)<\/text><text x=\"630\" y=\"294\" text-anchor=\"middle\" font-size=\"12\" fill=\"#16202b\">Does the circuit stay alive?<\/text><circle cx=\"542\" cy=\"42\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"542\" y=\"47\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">3<\/text><rect x=\"124\" y=\"90\" width=\"12\" height=\"170\" rx=\"3\" fill=\"#1d1f22\"\/><rect x=\"124\" y=\"200\" width=\"12\" height=\"60\" rx=\"3\" fill=\"#6b6b6b\"\/><path d=\"M130 272 C118 258 116 244 130 232 C144 244 142 258 130 272 Z\" fill=\"#e8841d\"\/><path d=\"M130 266 C124 258 123 250 130 243 C137 250 136 258 130 266 Z\" fill=\"#f6c44c\"\/><line x1=\"150\" y1=\"200\" x2=\"200\" y2=\"200\" stroke=\"#16202b\" stroke-width=\"1.2\" stroke-dasharray=\"3 3\"\/><text x=\"152\" y=\"194\" font-size=\"10.5\" fill=\"#16202b\">charred length<\/text><rect x=\"300\" y=\"90\" width=\"160\" height=\"170\" fill=\"none\" stroke=\"#3b4652\" stroke-width=\"1.5\"\/><rect x=\"360\" y=\"228\" width=\"40\" height=\"10\" rx=\"2\" fill=\"#1d1f22\"\/><path d=\"M380 226 C368 212 368 200 380 190 C392 200 392 212 380 226 Z\" fill=\"#e8841d\"\/><circle cx=\"372\" cy=\"170\" r=\"14\" fill=\"#9aa3ad\" opacity=\"0.55\"\/><circle cx=\"392\" cy=\"150\" r=\"18\" fill=\"#9aa3ad\" opacity=\"0.55\"\/><circle cx=\"376\" cy=\"128\" r=\"20\" fill=\"#9aa3ad\" opacity=\"0.55\"\/><circle cx=\"398\" cy=\"108\" r=\"16\" fill=\"#9aa3ad\" opacity=\"0.55\"\/><line x1=\"300\" y1=\"140\" x2=\"460\" y2=\"140\" stroke=\"#f6c44c\" stroke-width=\"3\"\/><circle cx=\"300\" cy=\"140\" r=\"6\" fill=\"#f6c44c\" stroke=\"#16202b\" stroke-width=\"1\"\/><rect x=\"454\" y=\"132\" width=\"12\" height=\"16\" fill=\"#3b4652\"\/><text x=\"380\" y=\"274\" text-anchor=\"middle\" font-size=\"10.5\" fill=\"#16202b\">light beam through the smoke<\/text><rect x=\"560\" y=\"150\" width=\"140\" height=\"12\" rx=\"3\" fill=\"#1d1f22\"\/><rect x=\"590\" y=\"150\" width=\"60\" height=\"12\" rx=\"3\" fill=\"#6b6b6b\"\/><rect x=\"585\" y=\"230\" width=\"70\" height=\"8\" fill=\"#3b4652\"\/><path d=\"M600 230 C590 212 592 196 600 176 C608 196 610 212 600 230 Z\" fill=\"#e8841d\"\/><path d=\"M620 230 C610 212 612 196 620 176 C628 196 630 212 620 230 Z\" fill=\"#e8841d\"\/><path d=\"M640 230 C630 212 632 196 640 176 C648 196 650 212 640 230 Z\" fill=\"#e8841d\"\/><line x1=\"700\" y1=\"156\" x2=\"720\" y2=\"156\" stroke=\"#16202b\" stroke-width=\"2\"\/><circle cx=\"720\" cy=\"140\" r=\"12\" fill=\"#f6c44c\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><line x1=\"720\" y1=\"152\" x2=\"720\" y2=\"156\" stroke=\"#16202b\" stroke-width=\"2\"\/><text x=\"630\" y=\"270\" text-anchor=\"middle\" font-size=\"10.5\" fill=\"#16202b\">lamp stays lit for the set time<\/text><\/svg><ol><li>Flame-retardant: a single vertical cable is exposed to a 1 kW flame; the cable passes when the burning does not spread beyond a set distance. It says nothing about whether the circuit still works.<\/li><li>Low smoke, zero halogen: a sample is burned in a 3 m cube and the light transmittance through the smoke is measured; a second test measures the halogen acid gas in the combustion products. These tests describe the sheath and insulation compounds, not the circuit.<\/li><li>Fire-resistant (circuit integrity): the cable is held in a flame at a set temperature for a set time, energised, and passes when the circuit stays alive; the British grades add mechanical shock and water spray. Only this group of tests makes a cable &ldquo;fire-rated&rdquo; in the sense of the enquiry.<\/li><\/ol><figcaption>Three fire properties, three tests. A cable can have any one of them without the others.<\/figcaption><\/figure>\n<p>For circuits that must keep working during a fire, TEBAOFLEX can make to order a fire-resistant two-core construction: copper conductors wrapped in mica-glass tape, XLPE insulation, an overall screen and an LSZH sheath, written CU\/MICA\/XLPE\/OS\/LSZH. The mica-glass tape is the fire barrier. When the XLPE burns away, the mica layer keeps the conductors insulated from each other and from the screen; that is the mechanism by which a mica-tape cable is intended to hold the circuit through the flame period of a circuit-integrity test, and which test applies, with the evidence for it, is agreed per order. The IEC 60331-21 method, which IEC has now withdrawn in favour of the fire-with-shock methods IEC 60331-1 and IEC 60331-2 at 830 \u00b0C, held the cable in a flame of at least 750 \u00b0C for 90 minutes and then for a further 15 minutes with the flame removed, energised at its rated voltage; the cable passed if no 2 A fuse blew and the lamp stayed lit. The same mica-tape principle is used on the fire-resistant marine and offshore cables in our range, such as the <a href=\"https:\/\/tebaoflex-cable.com\/product\/nek-606-bfou-p105-cable\/\">NEK 606 BFOU fire-resistant cable<\/a> and the <a href=\"https:\/\/tebaoflex-cable.com\/product\/tcu-mgt-epr-zh-gswb-zh-sw4-cable\/\">SW4 mica-tape marine cable<\/a>; the fire-resistant and flame-retardant designations are explained in our article on <a href=\"https:\/\/tebaoflex-cable.com\/rfou-vs-bfou-cable-nek-606-guide\/\">RFOU and BFOU cable designations<\/a>.<\/p>\n<h2>Does a voice evacuation speaker cable in the Philippines have to be fire-rated?<\/h2>\n<p class=\"tbf-answer\">Only where the system design puts the speaker circuit on a pathway that must survive a fire, and that is a design decision, not a cable choice. The Revised Implementing Rules and Regulations of the Fire Code of the Philippines (Republic Act 9514) refer to <a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-72-standard-development\/72\" target=\"_blank\" rel=\"noopener\">NFPA 72<\/a>, the National Fire Alarm and Signaling Code, for fire detection and alarm systems, and NFPA 72 does not require a particular cable: it requires a pathway survivability level for each circuit, from level 0 (no requirement) to level 3, with a 1-hour level 4 added in the 2022 edition. The designer and the authority having jurisdiction decide the level for the speaker circuits; the cable supplier then builds to it.<\/p>\n<p>The Philippine rules, administered by the Bureau of Fire Protection, accept either NFPA 72 or the latest Philippine Electronics Code and Philippine Electrical Code for these systems and say nothing themselves about circuit-integrity cable. Level 2 is met with a 2-hour fire-rated circuit-integrity cable, a 2-hour fire-rated cable system, a 2-hour fire-rated enclosure or a 2-hour alternative accepted by the authority; level 3 requires the same measures in a building fully protected by automatic sprinklers. Level 1 is met in a building fully protected by automatic sprinklers with the conductors in a metal raceway or a metal-armoured cable. For an in-building emergency voice\/alarm communications system, which the Philippine rules require in high-rise buildings of ten floors or more, NFPA 72 requires level 2 or 3 pathway survivability for the speaker circuits where the system is used for partial evacuation or relocation of occupants, with relaxations where the notification zones are separated by less than 2-hour construction or the pathways are redundant and routed apart; a system that evacuates the whole building at once may use any level. In the British codes the same decision is made through the standard and enhanced grades of BS 5839-1 and BS 5839-8.<\/p>\n<p>For the supplier that gives a simple rule. Where the cable itself must provide the survivability, the enquiry has to name the fire-resistance test the authority accepts, and the cable must carry the evidence for that test, whether a listing or a test report; TEBAOFLEX quotes its mica-tape LSZH construction only against a test named in the enquiry. Where the survivability comes from the raceway, the enclosure or the sprinklered building, or where the circuit is not on a survivability pathway, a screened PVC or LSZH speaker cable is the usual choice, subject to the cable type and installation method the installation code prescribes for that route. The Philippine mandatory product certification for wires and cables (the DTI PS and ICC marks) covers thermoplastic building wires and flexible cords, not alarm or speaker cables, so acceptance of the cable rests with the authority. LSZH is still worth specifying wherever the route runs through the ceilings of occupied escape routes: a PVC-insulated wire gives off about 0.3 g of hydrogen chloride per gram when it burns (<a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC7084980\/\" target=\"_blank\" rel=\"noopener\">NIH PMC combustion study<\/a>).<\/p>\n<p>The cable supplied on this order is the screened PVC construction and is not a fire-resistant cable. Where it is installed on the project, and whether any pathway there calls for a fire-resistant cable, were decided by the customer&#039;s system design and the authority having jurisdiction; TEBAOFLEX supplied the construction the order specified.<\/p>\n<h2>Does 2.5 mm\u00b2 make a difference on a 100 V speaker line?<\/h2>\n<p class=\"tbf-answer\">Yes, once the run is long and the load is more than a few speakers. A 100 V line with P watts of speaker taps draws P \u00f7 100 amperes, and the voltage drop is that current times the loop resistance of the run. With 300 W at the far end of a 200 m run, 2 \u00d7 2.5 mm\u00b2 copper drops 8.9 % of the line voltage, about 0.8 dB at the speakers, and 2 \u00d7 1.5 mm\u00b2 drops 14.5 %, about 1.4 dB (IEC 60228 maximum resistance at 20 \u00b0C, class 1 or 2). The British voice alarm code, BS 5839-8, recommends that the voltage drop on any loudspeaker circuit should not exceed 10 %.<\/p>\n<figure class=\"tbf-diag\"><svg class=\"tbf-sys\" viewBox=\"0 0 760 360\" role=\"img\" aria-labelledby=\"ch13-t\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title id=\"ch13-t\">Voltage drop on a 100 V loudspeaker line with 300 W of speaker taps at the far end, against run length, for 2\u00d71.5 mm\u00b2, 2\u00d72.5 mm\u00b2 and 2\u00d74 mm\u00b2 copper (IEC 60228 class 1 or class 2 resistance at 20 \u00b0C); a dashed line marks the 10 % voltage drop that BS 5839-8 recommends as the maximum<\/title><rect x=\"70\" y=\"20\" width=\"660\" height=\"280\" fill=\"#fff\" stroke=\"#3b4652\" stroke-width=\"1\"\/><line x1=\"70\" y1=\"300.0\" x2=\"730\" y2=\"300.0\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"62\" y=\"304.0\" text-anchor=\"end\" font-size=\"11\" fill=\"#16202b\">0 %<\/text><line x1=\"70\" y1=\"244.0\" x2=\"730\" y2=\"244.0\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"62\" y=\"248.0\" text-anchor=\"end\" font-size=\"11\" fill=\"#16202b\">5 %<\/text><line x1=\"70\" y1=\"188.0\" x2=\"730\" y2=\"188.0\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"62\" y=\"192.0\" text-anchor=\"end\" font-size=\"11\" fill=\"#16202b\">10 %<\/text><line x1=\"70\" y1=\"132.0\" x2=\"730\" y2=\"132.0\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"62\" y=\"136.0\" text-anchor=\"end\" font-size=\"11\" fill=\"#16202b\">15 %<\/text><line x1=\"70\" y1=\"76.0\" x2=\"730\" y2=\"76.0\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"62\" y=\"80.0\" text-anchor=\"end\" font-size=\"11\" fill=\"#16202b\">20 %<\/text><line x1=\"70\" y1=\"20.0\" x2=\"730\" y2=\"20.0\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"62\" y=\"24.0\" text-anchor=\"end\" font-size=\"11\" fill=\"#16202b\">25 %<\/text><line x1=\"70.0\" y1=\"20\" x2=\"70.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"70.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">0 m<\/text><line x1=\"180.0\" y1=\"20\" x2=\"180.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"180.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">50 m<\/text><line x1=\"290.0\" y1=\"20\" x2=\"290.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"290.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">100 m<\/text><line x1=\"400.0\" y1=\"20\" x2=\"400.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"400.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">150 m<\/text><line x1=\"510.0\" y1=\"20\" x2=\"510.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"510.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">200 m<\/text><line x1=\"620.0\" y1=\"20\" x2=\"620.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"620.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">250 m<\/text><line x1=\"730.0\" y1=\"20\" x2=\"730.0\" y2=\"300\" stroke=\"#e3e7eb\" stroke-width=\"1\"\/><text x=\"730.0\" y=\"316\" text-anchor=\"middle\" font-size=\"11\" fill=\"#16202b\">300 m<\/text><line x1=\"70\" y1=\"188.0\" x2=\"730\" y2=\"188.0\" stroke=\"#c62828\" stroke-width=\"1.5\" stroke-dasharray=\"6 5\"\/><text x=\"78\" y=\"182.0\" text-anchor=\"start\" font-size=\"11\" fill=\"#c62828\">BS 5839-8: 10 % voltage drop<\/text><polyline points=\"70.0,300.0 92.0,291.9 114.0,283.7 136.0,275.6 158.0,267.5 180.0,259.3 202.0,251.2 224.0,243.1 246.0,235.0 268.0,226.8 290.0,218.7 312.0,210.6 334.0,202.4 356.0,194.3 378.0,186.2 400.0,178.0 422.0,169.9 444.0,161.8 466.0,153.6 488.0,145.5 510.0,137.4 532.0,129.2 554.0,121.1 576.0,113.0 598.0,104.9 620.0,96.7 642.0,88.6 664.0,80.5 686.0,72.3 708.0,64.2 730.0,56.1\" fill=\"none\" stroke=\"#9aa3ad\" stroke-width=\"3\"\/><text x=\"724\" y=\"48.1\" text-anchor=\"end\" font-size=\"12\" font-weight=\"700\" fill=\"#9aa3ad\">2\u00d71.5 mm\u00b2<\/text><polyline points=\"70.0,300.0 92.0,295.0 114.0,290.0 136.0,285.1 158.0,280.1 180.0,275.1 202.0,270.1 224.0,265.1 246.0,260.2 268.0,255.2 290.0,250.2 312.0,245.2 334.0,240.2 356.0,235.3 378.0,230.3 400.0,225.3 422.0,220.3 444.0,215.3 466.0,210.4 488.0,205.4 510.0,200.4 532.0,195.4 554.0,190.5 576.0,185.5 598.0,180.5 620.0,175.5 642.0,170.5 664.0,165.6 686.0,160.6 708.0,155.6 730.0,150.6\" fill=\"none\" stroke=\"#1f7a5c\" stroke-width=\"3\"\/><text x=\"724\" y=\"142.6\" text-anchor=\"end\" font-size=\"12\" font-weight=\"700\" fill=\"#1f7a5c\">2\u00d72.5 mm\u00b2<\/text><polyline points=\"70.0,300.0 92.0,296.9 114.0,293.8 136.0,290.7 158.0,287.6 180.0,284.5 202.0,281.4 224.0,278.3 246.0,275.2 268.0,272.1 290.0,269.0 312.0,265.9 334.0,262.8 356.0,259.7 378.0,256.6 400.0,253.5 422.0,250.4 444.0,247.3 466.0,244.2 488.0,241.1 510.0,238.0 532.0,234.9 554.0,231.8 576.0,228.7 598.0,225.6 620.0,222.6 642.0,219.5 664.0,216.4 686.0,213.3 708.0,210.2 730.0,207.1\" fill=\"none\" stroke=\"#2b6fd6\" stroke-width=\"3\"\/><text x=\"724\" y=\"199.1\" text-anchor=\"end\" font-size=\"12\" font-weight=\"700\" fill=\"#2b6fd6\">2\u00d74 mm\u00b2<\/text><text x=\"400\" y=\"354\" text-anchor=\"middle\" font-size=\"12\" fill=\"#16202b\">run length from the amplifier to the speaker load (m)<\/text><text x=\"14\" y=\"160\" text-anchor=\"middle\" font-size=\"12\" fill=\"#16202b\" transform=\"rotate(-90 14 160)\">voltage drop on the line<\/text><\/svg><figcaption>Voltage drop on a 100 V line with 300 W of speaker taps placed at the far end (worst case), computed with the nominal line current (P \u00f7 100 A, a slightly conservative simplification) and the IEC 60228 maximum resistance at 20 \u00b0C for class 1 or class 2 copper (12.1, 7.41 and 4.61 \u03a9\/km); the dashed line is the 10 % voltage drop that BS 5839-8 recommends as the maximum for loudspeaker circuits. Loads spread along the run drop less.<\/figcaption><\/figure>\n<div class=\"tbf-tw\"><table><thead><tr><th>Run length<\/th><th>2\u00d71.5 mm\u00b2<\/th><th>2\u00d72.5 mm\u00b2<\/th><th>2\u00d74 mm\u00b2<\/th><\/tr><\/thead><tbody>\n<tr><th>50 m<\/th><td>3.6 % \/ &minus;0.3 dB<\/td><td>2.2 % \/ &minus;0.2 dB<\/td><td>1.4 % \/ &minus;0.1 dB<\/td><\/tr>\n<tr><th>100 m<\/th><td>7.3 % \/ &minus;0.7 dB<\/td><td>4.4 % \/ &minus;0.4 dB<\/td><td>2.8 % \/ &minus;0.2 dB<\/td><\/tr>\n<tr><th>150 m<\/th><td>10.9 % \/ &minus;1.0 dB<\/td><td>6.7 % \/ &minus;0.6 dB<\/td><td>4.1 % \/ &minus;0.4 dB<\/td><\/tr>\n<tr><th>200 m<\/th><td>14.5 % \/ &minus;1.4 dB<\/td><td>8.9 % \/ &minus;0.8 dB<\/td><td>5.5 % \/ &minus;0.5 dB<\/td><\/tr>\n<tr><th>300 m<\/th><td>21.8 % \/ &minus;2.1 dB<\/td><td>13.3 % \/ &minus;1.2 dB<\/td><td>8.3 % \/ &minus;0.8 dB<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>The loop resistance is twice the run length times the conductor resistance per metre, so the larger conductor buys either longer runs or more speakers per circuit. The table puts the whole 300 W load at the far end and uses the IEC 60228 maximum conductor resistance at 20 \u00b0C for class 1 or class 2 copper; a warm ceiling void raises the resistance by about 0.4 % per kelvin, and a load spread along the run drops less than the table shows. With 500 W on the line the drops are 1.7 times those shown. If the conductor is class 5 (fine-stranded, 7.98 \u03a9\/km) the 2 \u00d7 2.5 mm\u00b2 figures rise by 8 %: 4.8 % at 100 m, 9.6 % at 200 m and 14.4 % at 300 m. On a 70 V line the same tap power draws 1.43 times the current, so the percentage drop is about twice the 100 V figure for the same cable and run. Installers commonly design to 0.5 dB or 1 dB of level loss at the speakers, which is about 5.6 % or 10.9 % of voltage drop, and each voice alarm system manufacturer states the loss its amplifiers and line monitoring allow. The enquiry should therefore carry the longest run and the total tap power per circuit; the conductor size follows from those two numbers, not from the amplifier&#039;s power rating alone.<\/p>\n<h2>Why a braid-shielded speaker cable for voice alarm lines?<\/h2>\n<p class=\"tbf-answer\">The speaker lines of a voice alarm system run through ceiling voids and cable trays that they share with lighting, mains and drive cables, and in a voice alarm system the line is monitored as well as driven. A braid screen reduces what the pair picks up from those neighbours over a long run and what the speaker line itself radiates into the microphone, data and detector cabling beside it; a copper-wire braid of about 80 % coverage keeps that screening when the cable is bent and pulled, and gives a low-resistance drain.<\/p>\n<p>The screen does its work only when it is connected: bond it to earth at the amplifier rack, leave the far end insulated unless the system manufacturer&#039;s instructions say otherwise, and carry the screen through at every joint. A screened pair of this kind is the same idea as the collectively screened pairs of a <a href=\"https:\/\/tebaoflex-cable.com\/product\/bs5308-pas5308-part-1-type-1-instrumentation-cable\/\">BS 5308 Part 1 Type 1 instrumentation cable<\/a>, which uses an aluminium tape and drain wire instead of a braid; the unscreened 300\/500 V PVC counterpart is the <a href=\"https:\/\/tebaoflex-cable.com\/product\/h05vv-f-300-500v-pvc-flexible-cable\/\">H05VV-F flexible cable<\/a>.<\/p>\n<h2>Can a two-core speaker cable be printed with your company name? Marking, coils and label<\/h2>\n<p class=\"tbf-answer\">Yes, with a trial first. The customer asked whether its own company name and the cable specification could be printed on the cable. TEBAOFLEX prints customer names and specifications on request, but a two-core 2.5 mm\u00b2 cable is thinner than the cables the sheath printer is normally set up for, so production ran a trial before the marking was promised. The trial passed, the customer signed off the text, and the cable was printed with its company name, 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC and sequential metre marks; the coil photo shows the continuous production count, for example 5291 m.<\/p>\n<div class=\"tbf-print\">[customer&#039;s company name] 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC 5291 m<\/div>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-speaker-cable-200-m-coil-woven-wrap.webp\" alt=\"A 200 m coil of the cable in a woven wrap, marked by hand with the length and the size, on the factory floor\" width=\"1008\" height=\"1032\" loading=\"lazy\" decoding=\"async\"><figcaption>A 200 m coil in its woven wrap on the factory floor, marked by hand with the length and the size.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-speaker-cable-coil-with-packing-label.webp\" alt=\"A wrapped coil of the cable with the TEBAOFLEX packing label under the stretch film\" width=\"776\" height=\"848\" loading=\"lazy\" decoding=\"async\"><figcaption>A wrapped coil with the TEBAOFLEX packing label under the stretch film.<\/figcaption><\/figure>\n<\/div>\n<figure class=\"tbf-fig\"><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/tebaoflex-packing-label-shielded-control-cable-2x2-5mm2-200m.webp\" alt=\"TEBAOFLEX packing label on a coil: shielded control cable CU\/PVC\/CWB\/PVC, cable size 2\u00d72.5 mm\u00b2, packing length 200 m\" width=\"725\" height=\"550\" loading=\"lazy\" decoding=\"async\"><figcaption>The packing label on a coil: item name Shielded Control Cable CU\/PVC\/CWB\/PVC, cable size 2\u00d72.5mm\u00b2, packing length 200 m, weight 24.35 kg per coil.<\/figcaption><\/figure>\n<p>The coils were packed in 200 m lengths, each wrapped in woven polypropylene with the TEBAOFLEX label giving the item name, the size, the packing length and the weight (24.35 kg per coil, about 120 kg\/km), so that the installer can check each coil against the delivery note without unwrapping it. Coil length is set per order: 100 m or 200 m coils suit installers pulling into conduit, while longer lengths go on drums.<\/p>\n<h2>What to send for a shielded or fire-resistant speaker cable quote<\/h2>\n<div class=\"tbf-need\"><strong>Send these with your enquiry, and we can match the construction to the circuit before quoting.<\/strong>\n<ul>\n<li>The line voltage (100 V or 70 V) and the total tap power on the longest circuit, with its run length<\/li>\n<li>Whether the circuit is on a survivability pathway, and if so the fire-resistance test the authority having jurisdiction accepts (for example a 2-hour circuit-integrity listing, BS EN 50200 PH30 or PH120, BS 8434-2, IEC 60331-1 or -2)<\/li>\n<li>The flame-retardance class the specification calls for (IEC 60332-1-2 single cable or IEC 60332-3 bunched) and the cable designation it names (a BS 7629-1 type, an IEC 60227-7 type or a local standard)<\/li>\n<li>LSZH or PVC for the insulation and sheath, and the sheath colour<\/li>\n<li>Conductor size and class (solid or stranded), and the core colours<\/li>\n<li>Screen type (copper-wire braid or foil with drain wire) and how it will be earthed<\/li>\n<li>Total metres and number of circuits, the installation method (conduit, tray, clips) and any outer-diameter limit<\/li>\n<li>The marking text, including your own company name if the cable is for a project or for resale, and whether metre marks are wanted<\/li>\n<li>Coil or drum length, and the documents required with the delivery<\/li>\n<\/ul>\n<p>Related screened and fire-resistant constructions are listed under <a href=\"https:\/\/tebaoflex-cable.com\/products\/industrial-cables\/\">industrial cables<\/a>; the building speaker versions described here are made to order. As of August 2026, TEBAOFLEX&#039;s minimum order is 50 m for standard and custom cables alike. Lead times range from 7 to 45 working days depending on the product type and its customisation; the written quotation confirms the lead time for your order, and transit and customs time depend on the route.<\/p><\/div>\n<p><a class=\"tbf-cta\" href=\"https:\/\/tebaoflex-cable.com\/contact-us\/#request-quote\">Send your run lengths and speaker loads for a quote &rarr;<\/a><\/p>\n<h2>Questions on shielded and fire-rated speaker cables<\/h2>\n<div class=\"tbf-faq\">\n<details><summary>Is a CU\/PVC\/CWB\/PVC 300\/500 V cable a fire-rated cable?<\/summary><p>No. CU\/PVC\/CWB\/PVC describes a copper conductor, PVC insulation, a copper-wire braid screen and a PVC sheath. It is a screened general-purpose cable: it has no fire barrier, PVC is a halogenated compound that gives off smoke and acid gas when it burns, and the construction is not designed to keep a circuit alive in a fire. A fire-rated (fire-resistant) cable has a mica-glass tape or a similar barrier under the insulation and is tested for circuit integrity in a flame, for example to the IEC 60331 series, BS EN 50200 or BS 8434-2.<\/p><\/details>\n<details><summary>What does an enquiry that names a BS 7629-1 standard fire-resistant speaker cable ask for?<\/summary><p>A 300\/500 V screened two-core cable to BS 7629-1 with &ldquo;standard&rdquo; circuit integrity under BS 5839-1, a low-smoke zero-halogen sheath and a screen with a protective conductor. An enquiry that names the Prysmian FP200 GOLD reference is asking for those three properties together, which a PVC cable does not provide.<\/p><\/details>\n<details><summary>Can a 2&#215;2.0 mm\u00b2 speaker cable be made?<\/summary><p>2.0 mm\u00b2 is not a size in IEC 60228, the conductor standard behind the 1.0, 1.5, 2.5 and 4 mm\u00b2 series; it is close to 14 AWG (2.08 mm\u00b2), the size speaker-wire catalogues often list. A 2.0 mm\u00b2 conductor can be made to order, but it then needs its own tooling, its own resistance figure and its own cross-reference to the standard sizes. On this order the customer accepted the next standard size, 2 \u00d7 2.5 mm\u00b2, which has a lower resistance (7.41 \u03a9\/km against about 9 \u03a9\/km for 2.0 mm\u00b2) and so a lower loss on long speaker runs.<\/p><\/details>\n<details><summary>How long can a 100 V speaker line be with 2&#215;2.5 mm\u00b2 cable?<\/summary><p>It depends on the load on the line. With 300 W of speaker taps at the far end, a 2 \u00d7 2.5 mm\u00b2 copper line drops about 4.4 % of the line voltage at 100 m and 8.9 % at 200 m, against 7.3 % and 14.5 % for 2 \u00d7 1.5 mm\u00b2; BS 5839-8 recommends a maximum voltage drop of 10 % on a loudspeaker circuit. The figures use the IEC 60228 maximum resistance at 20 \u00b0C for class 1 or class 2 copper and put the whole load at the far end, which is the worst case. The voice-alarm system manufacturer states the loss its amplifiers and line monitoring allow; the run length and the load per circuit decide the conductor size.<\/p><\/details>\n<details><summary>Why do buyers prefer LSZH for speaker cables in public areas?<\/summary><p>Because the cable is installed above the ceilings of corridors, stairways and lobbies that people use to leave the building. PVC gives off dense smoke and hydrogen chloride when it burns; a low-smoke zero-halogen (LSZH) sheath and insulation are tested for low smoke density (IEC 61034-2) and for the absence of halogen acid gas (IEC 60754), so they add less to the smoke and corrosive gas in an escape route. LSZH on its own does not make a cable fire-resistant: that is a separate property with a separate test.<\/p><\/details>\n<details><summary>Can a thin two-core cable be printed with your company name?<\/summary><p>Yes, with a trial first. Sheath printers are set up for the larger cables, and a two-core 2.5 mm\u00b2 cable is near the lower limit of what they can mark legibly. For this order production ran a trial, the print was accepted, and the cable was printed with the customer&#039;s company name, 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC and sequential metre marks.<\/p><\/details>\n<details><summary>What should a buyer in the Philippines specify for an emergency voice evacuation speaker cable?<\/summary><p>First the survivability the system design requires for each pathway: NFPA 72, which the Revised Implementing Rules and Regulations of the Fire Code of the Philippines (RA 9514) refer to for fire detection and alarm systems alongside the Philippine Electronics Code and Electrical Code, defines pathway survivability levels, and the designer and the authority having jurisdiction decide which level applies to the speaker circuits. Where the cable itself must provide the survivability, specify a fire-resistant cable and the test it must meet; where the raceway or the building provides it, a screened PVC or LSZH speaker cable can be used, subject to the cable type the installation code prescribes for the route. Then the conductor size for the run length and load, LSZH or PVC, the screen, the colours, the marking text and the coil length.<\/p><\/details>\n<\/div>\n<div class=\"tbf-byline\">Project record prepared by <a href=\"https:\/\/tebaoflex-cable.com\/author\/zheng-lipeng\/\">Zheng LiPeng<\/a>, Manager, with the TEBAOFLEX cable engineering team. TEBAOFLEX is a special-cable factory in Taicang, Jiangsu, founded in 2014, with 12 production lines from rubber mixing to cabling and 8 sets of test equipment (as of September 2026). More about the factory on our <a href=\"https:\/\/tebaoflex-cable.com\/about-us\/\">about us page<\/a>.<\/div>\n<div class=\"tbf-back\"><a href=\"https:\/\/tebaoflex-cable.com\/cases\/\">&larr; Back to all industrial cable application cases<\/a><\/div>\n<\/div>\n\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"Article\", \"headline\": \"Shielded 2x2.5 mm\u00b2 PVC Speaker Cable with Customer Marking: a Voice Evacuation Enquiry from the Philippines\", \"description\": \"Case: 2x2.5 mm\u00b2 300\/500 V shielded speaker cable with customer marking, voice evacuation enquiry, Philippines: fire-rated vs PVC, LSZH, 100 V line loss.\", \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/tebaoflex-cable.com\/cases\/shielded-speaker-cable-2x2-5mm2-voice-evacuation-philippines\/\"}, \"url\": \"https:\/\/tebaoflex-cable.com\/cases\/shielded-speaker-cable-2x2-5mm2-voice-evacuation-philippines\/\", \"inLanguage\": \"en\", \"image\": [{\"@type\": \"ImageObject\", \"url\": \"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-speaker-cable-2x2-5mm2-voice-evacuation-philippines-case-og.webp\", \"width\": 1200, \"height\": 630}, {\"@type\": \"ImageObject\", \"url\": \"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/screened-speaker-cable-2x2-5mm2-voice-evacuation-philippines.webp\", \"width\": 1200, \"height\": 675}], \"author\": {\"@type\": \"Person\", \"@id\": \"https:\/\/tebaoflex-cable.com\/author\/zheng-lipeng\/\", \"name\": \"Zheng LiPeng\", \"url\": \"https:\/\/tebaoflex-cable.com\/author\/zheng-lipeng\/\", \"jobTitle\": \"Manager\", \"image\": \"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/09\/tebaoflex-author-headshot-100x100.jpg\", \"sameAs\": [\"https:\/\/www.linkedin.com\/in\/tebaoflexcable\/\"], \"worksFor\": {\"@id\": \"https:\/\/tebaoflex-cable.com\/#organization\"}}, \"publisher\": {\"@type\": \"Organization\", \"@id\": \"https:\/\/tebaoflex-cable.com\/#organization\", \"name\": \"TEBAOFLEX\", \"url\": \"https:\/\/tebaoflex-cable.com\/\"}, \"about\": [\"Shielded speaker cable 2x2.5 mm\u00b2\", \"Fire-resistant speaker cable\", \"Emergency voice evacuation system cabling\"], \"datePublished\": \"2026-10-15\", \"dateModified\": \"2026-10-15\"}<\/script>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is a CU\/PVC\/CWB\/PVC 300\/500 V cable a fire-rated cable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. CU\/PVC\/CWB\/PVC describes a copper conductor, PVC insulation, a copper-wire braid screen and a PVC sheath. It is a screened general-purpose cable: it has no fire barrier, PVC is a halogenated compound that gives off smoke and acid gas when it burns, and the construction is not designed to keep a circuit alive in a fire. A fire-rated (fire-resistant) cable has a mica-glass tape or a similar barrier under the insulation and is tested for circuit integrity in a flame, for example to the IEC 60331 series, BS EN 50200 or BS 8434-2.\"}}, {\"@type\": \"Question\", \"name\": \"What does an enquiry that names a BS 7629-1 standard fire-resistant speaker cable ask for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 300\/500 V screened two-core cable to BS 7629-1 with \u201cstandard\u201d circuit integrity under BS 5839-1, a low-smoke zero-halogen sheath and a screen with a protective conductor. An enquiry that names the Prysmian FP200 GOLD reference is asking for those three properties together, which a PVC cable does not provide.\"}}, {\"@type\": \"Question\", \"name\": \"Can a 2x2.0 mm\u00b2 speaker cable be made?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"2.0 mm\u00b2 is not a size in IEC 60228, the conductor standard behind the 1.0, 1.5, 2.5 and 4 mm\u00b2 series; it is close to 14 AWG (2.08 mm\u00b2), the size speaker-wire catalogues often list. A 2.0 mm\u00b2 conductor can be made to order, but it then needs its own tooling, its own resistance figure and its own cross-reference to the standard sizes. On this order the customer accepted the next standard size, 2 \u00d7 2.5 mm\u00b2, which has a lower resistance (7.41 \u03a9\/km against about 9 \u03a9\/km for 2.0 mm\u00b2) and so a lower loss on long speaker runs.\"}}, {\"@type\": \"Question\", \"name\": \"How long can a 100 V speaker line be with 2x2.5 mm\u00b2 cable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It depends on the load on the line. With 300 W of speaker taps at the far end, a 2 \u00d7 2.5 mm\u00b2 copper line drops about 4.4 % of the line voltage at 100 m and 8.9 % at 200 m, against 7.3 % and 14.5 % for 2 \u00d7 1.5 mm\u00b2; BS 5839-8 recommends a maximum voltage drop of 10 % on a loudspeaker circuit. The figures use the IEC 60228 maximum resistance at 20 \u00b0C for class 1 or class 2 copper and put the whole load at the far end, which is the worst case. The voice-alarm system manufacturer states the loss its amplifiers and line monitoring allow; the run length and the load per circuit decide the conductor size.\"}}, {\"@type\": \"Question\", \"name\": \"Why do buyers prefer LSZH for speaker cables in public areas?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Because the cable is installed above the ceilings of corridors, stairways and lobbies that people use to leave the building. PVC gives off dense smoke and hydrogen chloride when it burns; a low-smoke zero-halogen (LSZH) sheath and insulation are tested for low smoke density (IEC 61034-2) and for the absence of halogen acid gas (IEC 60754), so they add less to the smoke and corrosive gas in an escape route. LSZH on its own does not make a cable fire-resistant: that is a separate property with a separate test.\"}}, {\"@type\": \"Question\", \"name\": \"Can a thin two-core cable be printed with your company name?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, with a trial first. Sheath printers are set up for the larger cables, and a two-core 2.5 mm\u00b2 cable is near the lower limit of what they can mark legibly. For this order production ran a trial, the print was accepted, and the cable was printed with the customer's company name, 2\u00d72.5mm\u00b2 300\/500V CU\/PVC\/CWB\/PVC and sequential metre marks.\"}}, {\"@type\": \"Question\", \"name\": \"What should a buyer in the Philippines specify for an emergency voice evacuation speaker cable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"First the survivability the system design requires for each pathway: NFPA 72, which the Revised Implementing Rules and Regulations of the Fire Code of the Philippines (RA 9514) refer to for fire detection and alarm systems alongside the Philippine Electronics Code and Electrical Code, defines pathway survivability levels, and the designer and the authority having jurisdiction decide which level applies to the speaker circuits. Where the cable itself must provide the survivability, specify a fire-resistant cable and the test it must meet; where the raceway or the building provides it, a screened PVC or LSZH speaker cable can be used, subject to the cable type the installation code prescribes for the route. Then the conductor size for the run length and load, LSZH or PVC, the screen, the colours, the marking text and the coil length.\"}}]}<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Case: 2&#215;2.5 mm\u00b2 300\/500 V shielded speaker cable with customer marking, voice evacuation enquiry, Philippines: fire-rated vs PVC, LSZH, 100 V line loss.<\/p>","protected":false},"author":1,"featured_media":5525,"parent":3117,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5531","page","type-page","status-publish","has-post-thumbnail","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/pages\/5531","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/comments?post=5531"}],"version-history":[{"count":1,"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/pages\/5531\/revisions"}],"predecessor-version":[{"id":5649,"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/pages\/5531\/revisions\/5649"}],"up":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/pages\/3117"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/media\/5525"}],"wp:attachment":[{"href":"https:\/\/tebaoflex-cable.com\/de\/wp-json\/wp\/v2\/media?parent=5531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}