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BS7671 Amendment 2. Off-peak E7 consumer unit RCD and SPD.

Sparkingchip

Two new consumer units, peak and off-peak each remote from the intake with seventeen metre SWA distribution circuits.

The peak consumer unit will have Type A RCDs and a Surge Protection Device, is the off-peak consumer unit okay with a Type AC RCD and does it need another Surge Protection Device?

Andy.

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    it is an interesting question about doubling the spds- presumably the off-peak electrics is never on without the other board being on as well, there will be some cases with very short meter tails where the projection being share may well be OK.

    If the spd is on the far side of an rcd that may trip then while tripped it removes protection to the other loads, so they are at riskm rather than just an rcd costing less than the spd.but in any case a tripped RCD is normally quickly noticed and reset.

    of course if on different phases this does not apply.

    Mike

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  • 0

    it is an interesting question about doubling the spds- presumably the off-peak electrics is never on without the other board being on as well, there will be some cases with very short meter tails where the projection being share may well be OK.

    If the spd is on the far side of an rcd that may trip then while tripped it removes protection to the other loads, so they are at riskm rather than just an rcd costing less than the spd.but in any case a tripped RCD is normally quickly noticed and reset.

    of course if on different phases this does not apply.

    Mike

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