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Consumer Unit Blanking Plates

Former Community Member
Former Community Member

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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    I just checked a recent Wylex CU. There was no continuity from the front panel fixing screws (which are earthed) to the metal blanking strips, nor to the exposed metal hinges of the front lid.

    Wylex insist on metal blanking strips to maintain the non-combustible rating, but as mentioned earlier, it's not obvious why a “dummy” MCB made from the same material as a standard MCB is not suitable when when real MCBs are.

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    I just checked a recent Wylex CU. There was no continuity from the front panel fixing screws (which are earthed) to the metal blanking strips, nor to the exposed metal hinges of the front lid.

    Wylex insist on metal blanking strips to maintain the non-combustible rating, but as mentioned earlier, it's not obvious why a “dummy” MCB made from the same material as a standard MCB is not suitable when when real MCBs are.

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