It is conceivable that a loose live conductor could come into contact with a metal blanking plate. Some of the twist-on types do not make electrical contact with the (earthed / powder-coated) case in which case they thus constitute exposed conductive parts. This means that they should be individually earthed. But there is no means provided to do do this. So the question is: does the use of metal CU blanking plates contravene the Wiring Regulations if fitted but not earthed?
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