A 4mm, 4 core SWA is run to 4 pole rotary isolator from a 32amp three phase MCB. From the isolator, three lives and three neutrals feed three double sockets bushed to the bottom of the isolator.
On an EICR report, a C2 has been identified for this circuit - "Three single phase accessories split from one three phase supply. The neutral conductor shall not have a cross sectional area of less than the line conductors on single phase circuits and a cross sectional area of adequate size for design current and not smaller than 16mm for copper and 25mm for aluminium"
Bearing in mind all the other defects have been identified and quoted with a reg number it deviates from, this observation has no regulation number quoted. Where the hell has that come from?
The neutral current will never be more than any one phase, and with three sockets pulling full load, neutral will obviously be zero. Ideally, you would have a small TP DB before the sockets, but TBH, I really cannot see anything wrong with what has been done at all.
Comments?
On an EICR report, a C2 has been identified for this circuit - "Three single phase accessories split from one three phase supply. The neutral conductor shall not have a cross sectional area of less than the line conductors on single phase circuits and a cross sectional area of adequate size for design current and not smaller than 16mm for copper and 25mm for aluminium"
Bearing in mind all the other defects have been identified and quoted with a reg number it deviates from, this observation has no regulation number quoted. Where the hell has that come from?
The neutral current will never be more than any one phase, and with three sockets pulling full load, neutral will obviously be zero. Ideally, you would have a small TP DB before the sockets, but TBH, I really cannot see anything wrong with what has been done at all.
Comments?