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BS 6708 TYPE 7M

APPLICATION

Used for supplying excavating, crushing machines and equipment.

Certificates
Technical Information

CONDUCTOR : Electrolytic, stranded, tinned copper wire IEC 60228 Class 5
INSULATION : EPR (Ground core is not insulated).
SEPERATOR : Colored Textile tape for core identification.
SCREEN : Tinned copper / Nylon braided screen over phase and pilot cores.
LAYUP : All cores are laid up in contact with the bare copper earth conductor.
BEDDING : Rubber based bedding compound.
OUTER SHEATH : Heavy duty chloroprene outer sheath.

RELATED STANDARDS : BS 6708
RATED VOLTAGE : 640/1100 V
TEST VOLTAGE : 3 kV

Cross Section 3×16+16+16 3×25+16+25 3×35+18+35 3×50+25+50 3×70+35+70 3×95+50+95 3×120+50+120 3×150+70+150
Phase Conductor
Number and cross section mm2 3×16 3×25 3×35 3×50 3×70 3×95 3×120 3×150
Insulation diameter Nom. mm 8.85 10.35 11.60 13.60 15.70 17.25 20.05 22.20
Screen diameter Nom. mm 11.15 12.65 13.90 15.90 18.00 19.55 22.35 24.50
Earth Conductor
Number and cross section mm2 1×16 1×16 1×18 1×25 1×35 1×50 1×50 1×70
Stranding mm 126/0,40 126/0,40 147/0,40 196/0,40 276/0,40 396/0,40 396/0,40 360/0,50
Conductor diameter Nom. mm 5.50 5.50 6.00 6.75 8.00 9.75 9.75 11.60
Pilot Conductor
Number and cross section mm2 1×16 1×25 1×35 1×50 1×70 1×95 1×120 1×150
Stranding mm 126/0,40 196/0,40 276/0,40 396/0,40 360/0,50 475/0,50 608/0,50 740/0,50
Conductor diameter Nom. mm 5.50 6.75 8.00 9.75 11.60 12.75 15.10 17.00
Insulation diameter Nom. mm 8.85 10.35 11.60 13.60 15.70 17.25 20.05 22.20
Screen diameter Nom. mm 11.15 12.65 13.90 15.90 18.00 19.55 22.35 24.50
Cable details
Min. overall diameter mm 35.8 39.7 43.1 48.5 55.1 62.4 68.0 70.4
Max. overall diameter mm 38.6 42.9 46.3 51.8 58.8 66.1 72.5 78.4
Min. bending radius mm 309 343 370 414 470 529 580 627
Max. pulling tension kgf 480 642 834 1.2 1.68 2 2 2
Appx. cable weight kg/km 2.5 3.15 3.65 4.7 6.35 8.2 9.9 11.8
Copper weight kg/km 1.13 1.38 1.8 2.45 3.35 4.5 5.3 7.35
Electrical details
“Continuous current
rating at 25°C Ambient”
A 85 110 135 170 205 250 295 320
“Intermittent current
rating at 25°C Ambient”
A 96 125 150 200 250 310 355 385
Max. DC resistance at 20°C
Phase Conductor Ω /km 1.24 0.795 0.565 0.393 0.277 0.21 0.164 0.132
Pilot Conductor Ω /km 1.24 0.795 0.565 0.393 0.277 0.21 0.164 0.132
4 screens and earth in parallel connection Ω /km 0.58 0.47 0.45 0.38 0.27 0.23 0.21 0.158
Nom. reactance at 50Hz Ω /km 0.109 0.107 0.101 0.098 0.095 0.094 0.092 0.08
Nom. reactance at 60Hz Ω /km 0.131 0.128 0.121 0.118 0.114 0.113 0.11 0.096
Min. insulation
resistance at 20°C
M Ω /km 435 375 325 285 0.26 0.25 250 250
3 phase voltage drop on full load current mV/A/m 2.62 1.68 1.2 0.84 0.61 0.47 0.38 0.32

 

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