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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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  • 0
    Can't argue with the question about why there's a requirement to verify it.


    It's actually in IEC and HD 60364-6 as well ... I'm guessing (although it's only a guess) that it's seen as good workmanship - in BS 7671 the particular Regulations I pointed out in Part 1 - and therefore worthy of verification.


    I personally can't see a reason to argue against checking for it, as it may cause an issue (maybe a safety issue) for installation of appliances later, some of which, such as laundry equipment, may connect via plug and socket-outlet, i.e. not part of the installation, but essentially almost "plug and play".


    So, I think the converse question should be asked ... why is there not a requirement, say in Part 4, to maintain phase sequence throughout the installation?
Reply
  • 0
    Can't argue with the question about why there's a requirement to verify it.


    It's actually in IEC and HD 60364-6 as well ... I'm guessing (although it's only a guess) that it's seen as good workmanship - in BS 7671 the particular Regulations I pointed out in Part 1 - and therefore worthy of verification.


    I personally can't see a reason to argue against checking for it, as it may cause an issue (maybe a safety issue) for installation of appliances later, some of which, such as laundry equipment, may connect via plug and socket-outlet, i.e. not part of the installation, but essentially almost "plug and play".


    So, I think the converse question should be asked ... why is there not a requirement, say in Part 4, to maintain phase sequence throughout the installation?
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