Type 20 / Type 21 BS 6708 640/1100 V Armoured Mining Cable

Type 20 / Type 21 for excavating and crushing machines and equipment

Type 20 / Type 21 mining cable is specified in the supplied BS 6708 datasheet for excavating and crushing machines and equipment. This page keeps the source-listed voltage, test reference, core functions and dimensional tables together so a procurement engineer can compare the requested model against the cable marking and the equipment connection. The editorial focus is the armoured unscreened power path, not a generic promise of performance.

The supplied construction uses three or four unscreened cores laid around an elastomeric cradle without contacting one another, with galvanized steel pliable armour between inner and outer sheaths. That arrangement matters because The core count is the principal distinction: Type 20 is three-core and Type 21 is four-core; neither is an individually screened coal-cutter cable. The family should therefore be selected by model, core function and installation route as well as by voltage. The mining and tunnelling cable range provides the wider TEBAOFLEX product context.

• Choose by: confirm whether the equipment requires the three-core Type 20 or four-core Type 21 arrangement and check the armour interface.
• Confirm before ordering: existing sheath marking, conductor area, cable length, route, support or handling system, terminations and the required inspection documents.
• Do not infer: values not listed in the supplied PDF, such as a different current basis, water/oil/UV performance, certification scope or mechanical interchangeability.

For model screening around core count and armoured low-voltage routes, consult the BS 6708 mining cable replacement guide before issuing a replacement request.

For a technical quotation, send the equipment nameplate or existing cable marking, voltage and size requirement, installation conditions, quantity, destination and any project-specific test or documentation requirement.

Type 20 / Type 21 construction

The cross-section below is the supplied construction drawing for Type 20 / Type 21. The ordering decision is driven by The core count is the principal distinction: Type 20 is three-core and Type 21 is four-core; neither is an individually screened coal-cutter cable.

Source-listed construction

Do not use the drawing as a substitute for the dimensional tables. Confirm the cable end preparation, screen and earth termination, armour bonding and machine interface with the equipment documentation before installation.

Type 20 / Type 21 applications

The supplied datasheet identifies this cable for excavating and crushing machines and equipment. Google result patterns for the BS 6708 family also separate cables by equipment duty, voltage class, core function and whether the route is armoured, screened, flat or auxiliary. That is why this page keeps the Type 20 / Type 21 construction separate from nearby Type numbers.

• Primary duty: excavating and crushing machines and equipment.
• Model boundary: The core count is the principal distinction: Type 20 is three-core and Type 21 is four-core; neither is an individually screened coal-cutter cable.
• Project check: match the cable marking, core map, voltage, termination, route geometry and handling method to the machine drawing.
• Environmental review: confirm the actual mine/quarry conditions and any authority, inspection or documentation requirements; do not infer a certification or material-resistance claim from the model number.

For lower-voltage armoured equipment routes, the Type 70/71 mining cable offers a useful comparison point; verify the voltage class and core requirement before selection.

The cable should be released only after the equipment route, required length, conductor area, core functions and connection details are agreed. If the intended duty is different from the source-listed application, request an engineering review through the quotation process.

Type 20 / Type 21 specifications

The summary below identifies the supplied model family. The source-transcribed tables that follow retain the PDF's dimensional, electrical and construction values, including available sizes, resistance, current, diameter, mass, bending or pulling data when the PDF provides them.

Complete source-transcribed technical tables

Source PDF: BS6708_TYPE_20_TYPE_21_640_1100V_ARMOURED_CABLE_datasheet.pdf; 4 pages; 8 extracted tables. Values are not recalculated or replaced by third-party values.

Use the table values with the equipment drawing and approved termination plan. If the requested conductor area, current basis, mechanical limit or environmental condition is not listed in the supplied PDF, treat it as a quotation-stage confirmation item.

Type 20 / Type 21 standards and references

The product page preserves the BS 6708 reference appearing in the supplied PDF. The BSI record currently identifies BS 6708:1998 as withdrawn on 22 May 2026; this status note is a standards-reference update, not a claim that the product is currently certified or approved. See the official BSI BS 6708 scope record for the published status.

For an RFQ, state the required standard documents, inspection scope, test report, cable marking, destination rules and any replacement-equivalence requirement. The model number alone does not establish legal installation compliance.