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Regulation 551.7.2.1 (Amd 4) Supply Side compliance.

Steve Nixon76

The following is taken from an IET Wiring Matters article:

'Regulation 551.7.2.1 requires the generating set to be installed on the supply side of all the protective devices'

Can compliance with this regulation be achieved through the use of a Bi-Directional protective device (as introduced in Amd 3) within the main CU or would it require a separate CU sharing the incoming meter tails using Henley blocks?

Interested in all your opinions and advice.

Cheers,

Steve

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    Steve Nixon76 said:
    Can compliance with this regulation be achieved through the use of a Bi-Directional protective device (as introduced in Amd 3) within the main CU

    Yes, but:

    • you need to think about the current rating InA of the CU, see Regulation 551.7.2.2.
    • you need to think about RDF (rated diversity factor) according to the CU manufacturer's instructions, considering that, for example, PV arrays generate power for a number of consecutive hours.
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    Steve Nixon76 said:
    Can compliance with this regulation be achieved through the use of a Bi-Directional protective device (as introduced in Amd 3) within the main CU

    Yes, but:

    • you need to think about the current rating InA of the CU, see Regulation 551.7.2.2.
    • you need to think about RDF (rated diversity factor) according to the CU manufacturer's instructions, considering that, for example, PV arrays generate power for a number of consecutive hours.
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