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Phase rotation

geov
Hi all, long time not here, but as always, value the opinions of members.

EICR on a commercial. Incoming phase rotation correct at head, but all 8 sub mains in the MCCB panel have been incorrectly installed L3, L2, L1.

Been like this since the building was refurbished 10 years ago.

They do have some three phase equipment which is running happily ( tho’ I’ve not been able to switch off to see if the rotation fail  has been corrected at the local isolator).

I’m minded to code C3 - anyone disagree & if so why?
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    I agree, but I think the only Regulation does it not comply with is 134.1.1 (also perhaps 134.1.3 at a push).


    To the best of my knowledge, the only Regulation outside Part 6 that mentions phase rotation is 463.3.3, which requires protection against phase reversal where required for safety.


    Whilst verification is required in 643.9, a requirement for verification cannot in itself be transposed into a requirement for design and erection. Basically, you complied with the requirement to verify it (and came up with the answer that the phase rotation is not maintained).


    What that means in the grand scheme of things in a particular installation where phase rotation is not important is, in my opinion, purely and simply poor workmanship, based on the fact that there is no requirement for phase rotation to be maintained in BS 7671, perhaps with the exception of conductor identification.
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  • 0
    I agree, but I think the only Regulation does it not comply with is 134.1.1 (also perhaps 134.1.3 at a push).


    To the best of my knowledge, the only Regulation outside Part 6 that mentions phase rotation is 463.3.3, which requires protection against phase reversal where required for safety.


    Whilst verification is required in 643.9, a requirement for verification cannot in itself be transposed into a requirement for design and erection. Basically, you complied with the requirement to verify it (and came up with the answer that the phase rotation is not maintained).


    What that means in the grand scheme of things in a particular installation where phase rotation is not important is, in my opinion, purely and simply poor workmanship, based on the fact that there is no requirement for phase rotation to be maintained in BS 7671, perhaps with the exception of conductor identification.
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