Tim Sh>
>> >>> I have been asked to offer an opinion in a sensitive situation.
>>>
>>> A machinist moved his shop across town and required some rewiring
>>> (3-phase outlets, conduit, etc.) in order to locate some machines where
>>> he wanted them.
>>>
>>> He hires a guy who's not a pro (and later discovers is not insured) but
>>> has done shop wiring before and had a good attitude and track record. The
>>> guy does good work. No complaints about the quality of his work.
>>>
>>> Owner throws the switch, all works fine.
>>>
>>> The story continues 4 weeks later when the very expensive CNC fries its
>>> controller PCB to the tune of $4000.
>>>
>>> Turns out the voltage in the shop was upward of 245 and the taps in the
>>> CNC's power supply were set for 220.
>>>
>>> What is the legal and moral responsibility of each party?
>>>
>>> What will not be helpful are replies about the character or intelligence
>>> of either of the players or their actions.
>>
>> From my past experience in industrial environments, it's 100%
>> guaranteed that the electrician will wire the 3-phase feeds wrong.
>> Either the phases will be out of sequence (motor spins backwards), or
>> it'll be Delta instead of Wye, or wrong voltages, or something. It has
>> absolutely nothing to do with how much specifying you try, it'll get
>> hooked up wrong every single time.
>>
>> Tim.
>
>You need to dump the outfit you are using and use a competent electrician.
The electricians I engaged to run 3-phase 208 40A wire from a panel to a new machine (with a plug etc), non union, but licensed... they insisted I interpret the machine manual for them (I'm not an electrician--- they might have noticed my iron ring but I think they just wanted 'the customer' (in their mind) to take responsibility).
They also refused to have anything to do with turning the new machine on. ;-) And I didn't want the client company to pay $2K just to have some joker from the manufacturer hanging around while the breaker was flipped, so I did that myself. ;-)
Maybe they've had problems with knuckleheads trying to rip them off?