Discuss Feeding 250 amp 3 phase board direct from buzz bar need isolatir in the Commercial Electrical Advice area at ElectriciansForums.net
If the fuses are 100amp can I feed the dist board directly with 35 mm tails thxI think tbh you need to know exactly what is existing, you cannot design a system by guessing what's existing, like I said earlier, small mistakes cost big in this side of the industry.
Maybe he couldn't get a 100amp dist-board hence why he got the isolator?but then the cost in price is a huge difference?But he had said to use 25mm tails.il have to run through the design with him tomorrow,thx for the advise really appreciate it.Yes but you have to look at the bigger picture here, can the fuses be uprated again ie.. is the cable big enough to do so, you want to avoid forcing limitations on future additions, they may just have 100amps because of the low demand but fitted a 200amp system for expansion, we lack the info to give you a true informed reply but your boss really should have done all this and supplied you with the correct gear to start with with which I have my doubt he has.
Will check in the morningwhat 250A D.B. have you been provided with ?
Tri -rated?
You raise a good point but tri rated still has a higher capacity at 70c plus we do not know the switchgear, the busbar will be ok for 90, I install this stuff all the time and you can maintain the 90c ratings if you choose the correct gear, otherwise it's pointless making it.Probably be ok but the ratings are based on 90degC remember with tri.
Reply to Feeding 250 amp 3 phase board direct from buzz bar need isolatir in the Commercial Electrical Advice area at ElectriciansForums.net
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