[onetime]

I think the question was designed to see if the apprentice knows what single phasing is and in that context it makes sense. Then you can have a good conversation about single phasing, causes and affects.

 

[ct2]

Has anyone seen a piece of equipment intentionally connected single phased?

I connected a 125 amp spot welder using two legs of a 480 volt 3 phase circuit

 

[jtricor]

The answer is d, but not for very long if a load is present