Mace Canute
Elite Member
I'm curious why it couldn't be primary feed. Granted, I don't know how you crazy Canadians do things, (politely I'm guessing) but couldn't the transformer be like this:
View attachment 447718
...assuming transformer is center grounded, if you lost one leg of the primary wouldn't you only have one leg of the secondary?
I guess OP could always ask his neighbors if they experienced same thing.
I agree it's more likely to be a secondary problem.
Edit: Ok, I guess it's unlikely the primary would be center grounded (wye), so yes, with a delta primary you would lose both secondary legs if one primary goes out. ...but if it was....
Short answer is the primary winding on a single phase transformer is never center grounded because it isn't needed to obtain 120/240 V on the secondary and it would add a level of cost and complexity that serves no purpose.
On any single phase distribution transformer I've ever seen the primary winding was always connected in either one of two ways...either phase to phase like this
or phase to ground like this
If it only has a single primary bushing the H2 end of the primary winding will be connected to the case (usually internally) which is connected to ground, if your system uses a single primary feed and an earth return to complete the circuit or a grounded conductor in areas where the earth's conductivity is too poor for an earth return system but that's besides the point of your question.
