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Extra Low Voltage (ELV)

Former Community Member over 4 years ago

Guys,

BS7671:2018 is classing cables extra low voltage (ELV) as an operating voltage not exceeding 50Vac or 120V ripple-free dc.

BS7671 goes on to further categorize ELV cables into SELV, PELV, FELV.

For single core green/yellow insulated equipotential bonding cables lets say originating from an earth bar and bonding some structural steel work, are these classed as FELV under BS7671:2018 ?

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0 Former Community Member over 4 years ago

Mike

Andy in my opinion I would agree and I would say the current is the relevant factor. For example we frequently use a 10mm2 bare un-insulated aluminium cable/tape under BS EN/IEC 62305 to conduct millions of volts safely to ground during a strike.

I thought BS EN 62305 indicated that aluminium components of a LPS should be a minimum of 50mm2 if solid round or stranded round and 70mm2 if tape.

Did you mean 10mm diameter (allowable as a reduction for short air terminations) or exceeding the nominal 8mm diameter of circular aluminium of 50mm2 CSA

Regards

OMS
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0 Former Community Member over 4 years ago

Mike

Andy in my opinion I would agree and I would say the current is the relevant factor. For example we frequently use a 10mm2 bare un-insulated aluminium cable/tape under BS EN/IEC 62305 to conduct millions of volts safely to ground during a strike.

I thought BS EN 62305 indicated that aluminium components of a LPS should be a minimum of 50mm2 if solid round or stranded round and 70mm2 if tape.

Did you mean 10mm diameter (allowable as a reduction for short air terminations) or exceeding the nominal 8mm diameter of circular aluminium of 50mm2 CSA

Regards

OMS
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Extra Low Voltage (ELV)

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