supersparky
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no way anyone can advise you mate, its impossible, its like asking the length of a piece of string.
150 amps is a ferking lot, then you say its star / delta wired, implying its three phase, we don't know the cable run, the caracteristics of the supply, thermal and other enviromental correction factors to apply, ect ect.
if its not three phase then your in the realm of mccbs and asking the electricity company for an upgrade i would think, and they won't instal anything unless you have a certificate for the work
and to be honest, you do need an electrician for this, don't forget if you don't work everything out, every correction factor, control circuit wiring, protection, cable type to use, instalation method, supply characteristics, other issues with existing instalation, ect ect the list goes on, and if there is a problem, its on your neck.
not worth it mate, 3 phase voltage is 415v, if you get hit with that your pretty much as good as dead, if you manage to survive then you would have to go to hospital anyway as it will cook you from inside instantly, please don't try this
ss
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