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BS 6708 TYPE 307M

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 : 1,9/3,3 kV
TEST VOLTAGE : 7,5 kV

Cross Section 3×25+25+25 3×35+25+35 3×50+35+50 3×70+50+70 3×95+50+95 3×120+70+120
Phase Conductor
Number and cross section mm2 3×25 3×35 3×50 3×70 3×95 3×120
Insulation diameter Nom. mm 13.10 14.75 15.80 17.80 19.20 21.60
Screen diameter Nom. mm 15.50 17.10 18.20 20.15 21.60 23.95
Earth Conductor
Number and cross section mm2 1×25 1×25 1×35 1×50 1×50 1×70
Stranding mm 196/0,40 196/0,40 276/0,40 396/0,40 396/0,40 360/0,50
Conductor diameter Nom. mm 6.75 6.75 8.20 9.80 9.80 11.70
Pilot Conductor
Number and cross section mm2 1×25 1×35 1×50 1×70 1×95 1×120
Stranding mm 196/0,40 276/0,40 396/0,40 360/0,50 475/0,50 608/0,50
Conductor diameter Nom. mm 6.75 8.35 9.40 11.35 12.75 15.10
Insulation diameter Nom. mm 13.10 14.75 15.80 17.80 19.20 21.60
Screen diameter Nom. mm 15.50 17.10 18.20 20.15 21.60 23.95
Cable details
Min. overall diameter mm 47.4 51.6 56.8 62.8 68.9 73.4
Max. overall diameter mm 49.9 54.6 59.8 65.8 72.7 77.4
Min. bending radius mm 399 437 478 526 581 617
Max. pulling tension kgf 642 834 1.2 1.68 2 2
Appx. cable weight kg/km 4.2 5 6.5 8.1 9.8 11.6
Copper weight kg/km 1.664 2.048 2.866 3.682 4.546 5.65
Electrical details
“Continuous current
rating at 25°C Ambient”
A 110 135 170 205 250 295
“Intermittent current
rating at 25°C Ambient”
A 130 155 210 255 315 360
Max. DC resistance at 20°C
Phase Conductor Ω /km 0.795 0.565 0.393 0.277 0.21 0.164
Pilot Conductor Ω /km 0.795 0.565 0.393 0.277 0.21 0.164
4 screens and earth in
parallel connection
Ω /km 0.45 0.45 0.31 0.31 0.25 0.25
Nom. reactance at 50Hz Ω /km 0.125 0.117 0.113 0.108 0.105 0.101
Nom. reactance at 60Hz Ω /km 0.15 0.141 0.136 0.129 0.126 0.121
Min. insulation
resistance at 20°C
M Ω /km 1250 1100 950 820 720 660
3 phase voltage drop on full load current mV/A/m 1.69 1.21 0.85 0.61 0.48 0.39

 

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