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Metal conduit between two light fittings

Mark D Gray

Hi all,

we are having a discussion in the office and wanted your thoughts on the subject. If you have a metal conduit fitted between two plastic light fittings, the circuit is wired in singles (including a separate CPC), is there a requirement to earth the metal conduit? 

  • 0

    I would say yes. If the live scags the exposed conduit it will become live if it isn't earthed.

    Gary

  • 0 in reply to aligarjon

    if the cable inside the conduit is normal singles then I'd say definitely yes too - the earthed conduit is the necessary 2nd line of defence.

    Perhaps if it was T& E or something, it would be arguably less important and just a floating conductive part.
    Or if the conduit was designed and treated like a live bus bar and in a suitable enclosure. 

    I suspect neither applies, so get those pirahna nuts at the ready ;-) 

    Mike.

  • 0

    Is this a real issue, or just an office debate?

    What the lamp fittings are made of, even if they are double-insulated, is irrelevant. The risk arises from the cables passing through the conduit.

  • 0

    Only exceptions I can think of if is the circuit isn't normal LV - e.g. SELV or perhaps separated LV, or (very rarely) if the conduit was out of reach (unlikely in uncontrolled environments like normal offices).

       - Andy.

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