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BS 6708 TYPE 331

Mining Certficated Cables

Certificates :

APPLICATION

Used for supplying excavating, crushing machines
and equipment. Can also be used as trailing cable in
quarries.

CONDUCTOR : Electrolytic, stranded, tinned copper wire IEC 60228 Class 5
INSULATION : EPR
SCREEN : Tinned copper / Nylon braided screen over phase cores. Ground core is not screened.
LAYUP : All cores are laid up in contact with each other.
BEDDING : Rubber based bedding compound.
ARMOUR : Galvanized steel pliable armour.
OUTER SHEATH : Heavy duty chloroprene outer sheath.

RELATED STANDARDS : BS 6708
RATED VOLTAGE : 1900/3300 V
TEST VOLTAGE : 7,5 kV

Cross Section3×25+163×35+253×50+353×70+503×95+703×120+70
Phase Conductors
Number and cross sectionmm23×253×353×503×703×953×120
Strandingmm196/0,40276/0,40396/0,40360/0,50475/0,50608/0,50
Conductor diameterNom. mm7.108.4010.1011.9013.9015.50
Insulation thicknessmm3.03.03.03.03.03.0
Phase Conductors
Number and cross sectionmm21×161×251×351×501×701×70
Strandingmm126/0,40196/0,40276/0,40396/0,40360/0,50360/0,50
Conductor diameterNom. mm5.507.108.4010.1011.9011.90
Insulation thicknessmm3.03.03.03.03.03.0
Cable details
Radial thickness of inner sheathmm2.53.83.85.05.05.0
Min. inner sheath diametermm42.248.252.560.065.168.8
Max. inner sheath diametermm44.750.755.663.068.972.6
Size of armourmm7/0,907/0,907/0,907/1,257/1,257/1,25
Outer sheath thicknessmm5.15.55.96.46.97.3
Min. overall diametermm57.864.669.880.386.490.9
Max. overall diametermm61.668.473.884.690.795.2
Min. bending radiusmm7408218861.0161.0891.143
Appx. cable weightkg/km6.88.59.7515.618.120.05
Copper weightkg/km1.1641.5222.1963.0364.0284.758
Electrical details
“Continuous current
rating at 25°C Ambient”
A110135170205250295
Max. DC resistance at 20°C
Phase conductorsΩ /km0.7950.5650.3930.2770.2100.164
Earth conductorΩ /km1.240.7950.5650.3930.2770.277
ArmourΩ /km0.9650.8440.7150.4880.3820.299
3 screens in parallel connectionΩ /km1.350.800.700.690.640.55
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