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

AdrianWint:

I would say no.

In the event of a fault the cable could see the full mains potential. Therefore is not ELV at all but LV just like any other 'mains' conductor.

By your logic, let's say the structural steel is located inside a high voltage switchroom. Do you now deem the equipotential bonding cable as a HV conductor ?
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0 Former Community Member over 4 years ago

AdrianWint:

I would say no.

In the event of a fault the cable could see the full mains potential. Therefore is not ELV at all but LV just like any other 'mains' conductor.

By your logic, let's say the structural steel is located inside a high voltage switchroom. Do you now deem the equipotential bonding cable as a HV conductor ?
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Extra Low Voltage (ELV)

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