MVFP and MYPTJ-JS Metallic-Shielded Mine VFD Inverter and Feeder Cable

Underground coal mines now drive belt conveyors, hoists, winches, fans and main pumps through frequency converters, and the cable between converter and motor sees steep voltage fronts, common-mode currents and electromagnetic interference that ordinary mining power cable is not designed to handle. Chinese MT-system mines specify this link as MVFP, a shielded mine inverter cable, while medium-voltage pump and equipment feeds can be specified as MYPTJ-JS, an enterprise variant of the monitored MYPTJ family. This page covers both designations from 0.38/0.66 kV to 8.7/10 kV.

MVFP is built for fixed connection of mine frequency converter installations at 0.38/0.66 kV, 0.66/1.14 kV and 1.9/3.3 kV. Three tinned Class 5 copper power cores with EPR insulation are laid up with three symmetrical earth cores, for example 3×16+3×4 mm2, so the earth return is balanced, and a metallic screen under a chloroprene-type sheath contains interference. It is not intended for reeling or continuous trailing; mobile 2000 V VFD duty belongs to a different construction. MYPTJ-JS covers 3.6/6, 6/10 and 8.7/10 kV with metallic phase screens, split earth cores, an additional core and a chloroprene-type sheath, in layouts such as 3×16+3×16/3+1×10 mm2, for underground dewatering pumps and equipment feeds.

The JS suffix is an enterprise designation; TEBAOFLEX confirms its construction, the function of the additional core and any immersion conditions on the factory drawing, and no water-depth rating is claimed here. The China MA safety-mark certificates listed for standard MYPTJ on our MYPTJ page do not extend to MYPTJ-JS or MVFP.

Explore the mining and tunneling cable range for related configurations.

MVFP and MYPTJ-JS Shielded Mine VFD & Feeder Cable Construction

The representative horizontal sample shows an MVFP 0.66/1.14 kV 3x50+3x10 mm2 mine inverter cable: three tinned Class 5 copper power cores with EPR insulation, three symmetrical earth cores in the interstices, a tinned copper wire metallic screen over the core assembly and a flame-retardant chloroprene-type outer sheath; the exact screen arrangement is fixed on the order drawing.

MVFP and MYPTJ-JS Type Designation Breakdown

• M: coal-mine cable series referencing the MT 818 / KA 818 framework
• VF (in MVFP): variable-frequency converter (变频) output to motor fixed-installation feeder duty (0.38/0.66 to 1.9/3.3 kV)
• P (in MVFP): tinned copper wire metallic screen over the laid-up 3+3 core assembly
• 3+3 earth layout (MVFP): three EPR-insulated power cores laid up with three symmetrical earth cores in the interstices
• MYPTJ: coal-mine medium-voltage cable with metallic phase screens, split earth cores and monitoring core (MT/T 818.6 family)
• -JS (in MYPTJ-JS): enterprise-standard 3.6/6 to 8.7/10 kV feeder variant for underground dewatering pumps and equipment feeds

MVFP and MYPTJ-JS Mine Inverter & Monitored Feeder Applications

Use MVFP for fixed converter-to-motor links and MYPTJ-JS for medium-voltage pump and equipment feeders.

• Fixed connections between mine frequency converters and motors on belt conveyors, hoists, winches and main fans at 0.38/0.66 kV to 1.9/3.3 kV (MVFP).
• Converter-fed underground pump stations and auxiliary drives where a symmetrical 3+3 earth layout and metallic screen limit interference with mine monitoring systems (MVFP).
• Underground dewatering pumps and medium-voltage equipment feeds at 3.6/6 kV to 8.7/10 kV (MYPTJ-JS), with any immersion conditions confirmed on the drawing.
• Chinese coal machinery packages exported to overseas coal mines that call for MVFP or MYPTJ-JS by designation.

MVFP and MYPTJ-JS vs MYPTJ, 2000 V Mining VFD and 3GSEGCH Selection Boundary

MVFP is engineered for fixed converter-to-motor installations (not reeling or trailing); MYPTJ-JS serves 3.6/6 to 8.7/10 kV pump and equipment feeders where the -JS enterprise designation is specified.

Related selection resources

• Mining and tunneling cable engineering solutions
• What is VFD cable? Insulation, grounds and shield explained
• MYPTJ Monitored Medium-Voltage Mining Trailing Cable
• Mining VFD Cable 2000 V with 3 power, 3 ground and ground check
• Medium Voltage VFD Motor Cable 3GSEGCH / 3GSEGCY

MVFP and MYPTJ-JS Frequently Asked Questions

Why does MVFP use a 3+3 symmetrical earth layout and metallic screen?

Mine frequency converters generate steep dv/dt voltage fronts and common-mode currents. Laying three symmetrical earth cores in the interstices between the three EPR-insulated power cores balances the earth return, while the tinned copper wire metallic screen contains electromagnetic interference so nearby mine monitoring and communication circuits are not disturbed.

Can MVFP be used on mobile reeling drums or continuous trailing chains?

No. MVFP (0.38/0.66, 0.66/1.14 and 1.9/3.3 kV) is designed for fixed installation between frequency converter cabinets and motors on conveyors, hoists, winches, fans and pump stations, with a minimum bending radius of 8 x D. For mobile trailing or reeling VFD duty, select our 2000 V Mining VFD Cable or 3GSEGCH / 3GSEGCY medium-voltage VFD motor cable.

What is MYPTJ-JS and how is it used?

MYPTJ-JS is an enterprise-standard 3.6/6 kV, 6/10 kV and 8.7/10 kV rubber feeder cable based on the MT/T 818.6 MYPTJ family, combining three metallic-screened EPR power cores, three split earth cores (such as 3x16/3 to 3x35/3 mm²) and one 1x10 mm² additional core for underground dewatering pumps and medium-voltage equipment feeds.

What are the minimum order quantity and manufacturing lead time?

The minimum order quantity (MOQ) is 50 m and the manufacturing lead time is 7 to 45 working days, with screen arrangement, additional-core function and any immersion conditions confirmed on the factory drawing.

MVFP and MYPTJ-JS Dimensions, Current Rating & Technical Specifications

MVFP and MYPTJ-JS Key Specifications

• Models covered: MVFP (0.38/0.66, 0.66/1.14 & 1.9/3.3 kV VFD cable) and MYPTJ-JS (3.6/6, 6/10 & 8.7/10 kV feeder)
• Conductor & insulation: Tinned Class 5 flexible copper (MVFP 16–95 mm²; MYPTJ-JS 16–70 mm²) with 90 °C EPR insulation
• Earth & screen layout: MVFP: 3+3 symmetrical earth cores + overall tinned Cu wire screen; MYPTJ-JS: metallic phase screens + 3 split earths + 1x10 mm² core
• Outer sheath: Oil- and abrasion-resistant flame-retardant chloroprene-type rubber sheath tested to MT/T 386-2011
• Design references: Enterprise specs referencing MT/T 818.6-2009 (KA/T 818.6-2009), MT 818.1-2009, MT/T 386-2011, GB/T 3956

MVFP 0.38/0.66 kV to 1.9/3.3 kV Symmetrical-Earth Mine VFD Cable Schedule

MYPTJ-JS 3.6/6 kV to 8.7/10 kV Metallic-Screened Monitored Feeder Cable Schedule

Current ratings are nominal values for a single cable in air at 25 C and 90 C conductor temperature; for converter output circuits, also check cable length against the converter dv/dt limits and motor insulation class.

No China MA safety-mark coverage is claimed for MVFP or MYPTJ-JS on this page; the MA certificates for standard MYPTJ apply only to the models and sizes printed on those certificates.

ASCII part references for BOM and ERP entry: MVFP 3x16+3x4, MVFP 3x25+3x6, MVFP 3x35+3x6, MVFP 3x50+3x10, MVFP 3x70+3x16, MVFP 3x95+3x16, MYPTJ-JS 3x16+3x16/3+1x10, MYPTJ-JS 3x25+3x16/3+1x10, MYPTJ-JS 3x35+3x16/3+1x10, MYPTJ-JS 3x50+3x25/3+1x10, MYPTJ-JS 3x70+3x35/3+1x10.

MVFP and MYPTJ-JS Standards & Test References (MT/T 818.6-2009, MT/T 386-2011)

Certifications and document support

TEBAOFLEX company certificates and quality system documentation

National Public Service Platform for Standards Information (SAMR, China) — GB/T and coal-industry standard records