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BS 6708 TYPE 7S

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 cores. Pilot unit is not screened.
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 – 2,5kV (Pilot cores)

Cross Section 3×50+25+3×4 3×70+35+3×6 3×95+50+3×6 3×120+50+3×10 3×150+70+3×10
Phase Conductor
Number and cross section mm2 3×50 3×70 3×95 3×120 3×150
Insulation diameter Nom. mm 13.60 15.70 17.25 20.05 22.20
Screen diameter Nom. mm 15.90 18.00 19.55 22.35 24.50
Earth Conductor
Number and cross section mm2 1×25 1×35 1×50 1×50 1×70
Stranding mm 196/0,40 276/0,40 396/0,40 396/0,40 360/0,50
Conductor diameter Nom. mm 6.75 8.00 9.75 9.75 11.60
Pilot Conductors
Number and cross section mm2 3×4 3×6 3×6 3×6 3×10
Stranding mm 56/0,30 84/0,30 84/0,30 80/0,40 80/0,40
Conductor diameter Nom. mm 2.60 3.50 3.50 4.40 4.40
Insulation diameter Nom. mm 5.55 6.40 6.40 7.30 7.30
Diameter over sheath Nom. mm 15.60 17.70 19.25 22.05 24.20
Cable details
Min. overall diameter mm 48.5 55.1 62.4 68.0 70.4
Max. overall diameter mm 51.8 58.8 66.1 72.5 78.4
Min. bending radius mm 420 470 530 580 630
Max. pulling tension kgf 1.12 1.57 2 2 2
Appx. cable weight kg/km 4.45 6.08 6.65 8.3 10.5
Copper weight kg/km 2.2 3.15 4.25 4.8 5.3
Electrical details
“Continuous current rating at 25°C Ambient” A 170 205 250 295 320
“Intermittent current rating at 25°C Ambient” A 200 250 310 355 385
Max. DC resistance at 20°C
Phase Conductors Ω /km 0.393 0.277 0.21 0.164 0.132
Pilot Conductors Ω /km 5.47 3.6 3.6 2.09 2.09
3 screens and earth in parallel connection Ω /km 0.44 0.3 0.26 0.24 0.176
Nom. reactance at 50Hz Ω /km 0.098 0.095 0.094 0.092 0.08
Nom. reactance at 60Hz Ω /km 0.118 0.114 0.113 0.11 0.096
Min. insulation resistance at 20°C M Ω /km 285 260 250 250 250
3 phase voltage drop on full load current mV/A/m 0.84 0.61 0.47 0.38 0.32

 

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