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Part P Regs Clarification please

Brian Kneller

I am having the incomer my property modified and at the same time I am having an additional distribution installed in an extension. The current distribution board remains unchanged and both boards will share the incomer. If the supply to the existing distribution board is changed over to the modified incomer will a full test of the existing domestic distribution system be required? There are two options a) connect the existing distribution board to the new incomer using existing cabling so not changing any wiring in the existing board or connect a new cable instead. The existing board is tested and documented and is due for retest 2025.

Thank you

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    The incomer is beyond the scope of both BS7671 and Part p. It comes under ESQR and belongs to the electricity supplier and is not the installation owner's property.

    Part p really has nothing to do with electrical work other than requiring it to be installed and maintained in a safe manner.

    Your new dist board and any new sub  sub circuits will require inspection & testing prior to being commissioned into service. Your chosen installer should do this for you.

  • 0 in reply to whjohnson

    Thank you for your reply, I appreciate the incomer is outside my scope and the electricity provider has been contracted to relocate it. I take it from what you have said, as the existing board and and its existing cabling remain untouched except for reconnection to the new incomer then no retest of that part of the installation is required?

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  • 0 in reply to whjohnson

    Thank you for your reply, I appreciate the incomer is outside my scope and the electricity provider has been contracted to relocate it. I take it from what you have said, as the existing board and and its existing cabling remain untouched except for reconnection to the new incomer then no retest of that part of the installation is required?

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