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Hello all, after some advice please.

I have got a small job installing some 16a commando sockets in a farm workshop. The workshop has a 3ph sub DB on the wall which is fed from the main DB on the other side of the wall, about 25m away. The sub DB is supplied from two lots of 6mm2 twin in 25mm conduit acting as the 3ph supply with a 2 2.5mm2 cpc. The sub BD has a front end 100ma rcd as the whole farm is TT.

Other than all 3 phs being tagged red with no other ID, is this method of install an issue?

The rest of the farm is run in 4core SWA so guessing this one had been done some time ago. Any advice welcome. Haven't done any testing yet so dont know any results.
 
TL;DR
3ph board fed from two lots of twin.
T&E cable has a voltage rating of 300/500 (Uo/U) so theoretically it can be used for 400v supplies. What has been done is somewhat unconventional and you could argue it is a breach of Regulation 521.8.1 but is it a safety issue, probably not.
 

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