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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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    RCDwise I`d be happy with that. Unless your storage heaters are with some bristling electronics fandango that I`m not aware of.

    SPDwise, if single phase I`d tend to be happy - ish . Along the lines of what Lyle and Map have said.

    Just an aside. I`m assuming a TN system. If TT then I tend to err on 2 RCDs in cascade to help mitigate RCD failure which might well start to add costs considerably. I do tend to favour a plain DP Mainswitch & RCBO setup too , not as expensive as it used to be but again additional expense.

    Having said all that, my own home ("TNS") has a front end RCD and MCBs for peek and same again for off-peak, no SPD and I`m not worried.

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    RCDwise I`d be happy with that. Unless your storage heaters are with some bristling electronics fandango that I`m not aware of.

    SPDwise, if single phase I`d tend to be happy - ish . Along the lines of what Lyle and Map have said.

    Just an aside. I`m assuming a TN system. If TT then I tend to err on 2 RCDs in cascade to help mitigate RCD failure which might well start to add costs considerably. I do tend to favour a plain DP Mainswitch & RCBO setup too , not as expensive as it used to be but again additional expense.

    Having said all that, my own home ("TNS") has a front end RCD and MCBs for peek and same again for off-peak, no SPD and I`m not worried.

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