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?
Non since the machine could fail at any time irrespective of the move or wiring. The CNC machine would quite easily cope with this variation in supply voltage particularly in an industrial environment where spikes, dips and line noise would predominate.
What will not be helpful are replies about the character or
> intelligence of either of the players or their actions.
>
> Thanks.