Originally Posted by
High_Plains_Drifter
277 is what they call the "BASTARD VOLTAGE." It's the one hot leg out of 3 phase that isn't the same as the other two. You have to learn this shit like you and I or it will kill you.
Yeah my buddy and I just started putting a little tag on each circuit and twisting it in the box so I could keep track of it. Everything else I had no problem with. Thing is, if I was doing it myself, I'd know, but he didn't relate to me his grand plan and I'd always have to ask... ok, what are pulling this leg for? On and on, he wouldn't tell me unless I asked. I think he just assumed I was keeping track like he was. Problem was he's the master electrician, not me...
But, those times were actually few and far between. It was only a couple of our huge house rewire jobs I'd lose track. It was still fun... I especially liked when we'd run EMT... that's an art, I like that.
No. You are talking about a Delta transformer that has a high leg. I'd actually have to look it up to explain how the voltage works because I only worked on one or two. IIRC, 2 legs would be 120 and the high leg is 208
277/480v is 3 phase wye transformer. You have 3 277 volt legs that combined make 480v. 277v is used almost exclusively for florescent lighting. It's a lot less expensive and you can hook up like 27 2x4 lay-ins per circuit. If you have 120v, you can get like 11 lights and they use more electricity.
Last edited by Gunny; 05-26-2018 at 11:06 PM.
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