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

What is the size/type of the premises?  150amp sounds too large for extraction.

I expect it to be 3 phase at this loading, and deffinantly if it needs star delta starting

You are not simply adding current together are you?  It isn't simply a 50amp 3phase motor is it??  Thats more plausible.

Exactly my thoughts Jim. And I would add a couple of other points to that excellent advice.

If you are a qualified tradesperson then you should have professional indemnity insurance to cover your backside in the event that something went wrong. My bet is that the insurers wouldn't touch this with a barge pole if a claim was submitted - because PI requires that you must be substantially qualified/experienced to take on the work they are covering risk for, and the indications are that you might not be qualified/experienced.

The second point to make about that situation is that without PI to cover your backside a law court would go after your personal property - car, house, clean out your bank account, everything. You would be left destitute, and depending upon the circumstances reflecting on the prison sentence you've been issued with. It wouldn't matter if you had a limited company in the way, a law court would put that aside and deal with it as though you were a private individual. And if on a sole trader basis then you run the risk of personal possessions being lost whatever happens 'cos there is no protection of personal belongings with sole trader status.

As Jim says quite correctly - are you quite sure you know what you are getting into?

HM

This thread should be locked to prevent this idiot killing himself or someone else. You KNOW sooner or later Chubby will be along to tell him to put it on a plug!!

yup, it really is jobs like this we go to college for years and pay through the teeth for various registrations for

ss

On that note I'd add that many items have "if you are unsure please consult a qualified electrician" this is not happening by the looks of most places..

1. this is a diy forum.
2. you asked for advice;
Quote:


3. if there are an army of electricians and engineers" involved then why are you asking how to do it?

4. Quote:

to be honest, with the questions your asking, i wouldent trust you with either.

5. Quote:


why would the supply authority "check it out?"
your electrician/engineer/electrical contractors will request a supply of xxKW" and the supply co will install.....
obviously they will charge more if you don't have a very good power factor on your instalation....but thats for your "army" to be concerned with

sorry, don't mean to be harsh, but this is a wind up or its got the distinct smell of male equivilant of cow...."poo"

ss

150A spikes might do interesting things to nearby office computers if isn't done right.