P
p11jor
Hi all I am currently on a site and just pulling some data in the plant room and noticed this :-
Main LV panel
3 phase breaker rated 125amp with 25mm non armoured tails and 16mm earth supplying landlord board run in trunking with 27 other swa 16mm 3core
Then off the 3phase bus bars we have 3x 250amp 3phase breakers with 25mm non armoured tails running off to 3 seperate 3phase boards supplying 11apartments from each board split over 3phases again with a 16mm earth and run in with 27 other 16mm swa 3 core supplying the sub boards protected by a 63 amp breaker.
My understanding is that a 25mm single core non armoured cable 3phase run in trunking can only hold top end of 80amp (not sure of exact top of my head)
And same again with 35mm can only take 110ish in same situation...
Any thoughts?
Main LV panel
3 phase breaker rated 125amp with 25mm non armoured tails and 16mm earth supplying landlord board run in trunking with 27 other swa 16mm 3core
Then off the 3phase bus bars we have 3x 250amp 3phase breakers with 25mm non armoured tails running off to 3 seperate 3phase boards supplying 11apartments from each board split over 3phases again with a 16mm earth and run in with 27 other 16mm swa 3 core supplying the sub boards protected by a 63 amp breaker.
My understanding is that a 25mm single core non armoured cable 3phase run in trunking can only hold top end of 80amp (not sure of exact top of my head)
And same again with 35mm can only take 110ish in same situation...
Any thoughts?