So if my PT has 2 primary windings... I wire in parallel?

[Hardtailed]

My PT, a Hammond 290MX (AC30 replacement part), has 2 primary windings (120V and 120V). I'm guessing this is so people with 240V mains simply hook them up in series.

So here in Canada, do I use just one, or do I wire them in parallel?

I guess parallel makes sense, but I can't find any specific confirmation on their website.

[Enzo]

Yes, wire them in parallel. MAKE SURE THEY ARE PARALLELED IN PHASE.

Usually on the chart there is a black dot by the start end of each winding, or the wire color is identified as "start." There should be some way to identify the phase.

As a convention, when you see two primary windings, one above the other on a schematic, we tend to assume the two are draw the same way, ie the start is at the top of each.

parallel means start and start wired together, and finish and finish are wired together.

Get it backwards and you blow the fuse.

[Steve Conner]

My PT, a Hammond 290MX (AC30 replacement part), has 2 primary windings (120V and 120V). I'm guessing this is so people with 240V mains simply hook them up in series.

So here in Canada, do I use just one, or do I wire them in parallel?

Yes, wire them in parallel. I have 240V mains here, and I wire them in series.

If you think about it, they only make the wire in each winding thick enough to carry the current required for 240V operation. For 120V, the current doubles, so you need two lots of wire in parallel. Same reason as why you need twice the fuse rating.

[R ski]

Normally in electricians world x1 would join to x3 then x2 would join to x4, is any color code included with that transformer. if you use only one of the windings then the amp will sag when in heavy demand, the amp will be 1/1.41 lower in watts cant find square root on these dam QWERTY keyboard