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| I have a square D single phase 1.5KVA dry transformer and I am hoping to get a thumbs up before I energize it. It has 8 wires - H1,H2,H3,H4,X1,X2,X3,X4. It is obvious from the tag that the incoming 480V connects to H1 and H4 and the outgoing 120V is connected to X1 and X4. The rest of the wiring is confusing. I wire nutted H2 and H3 together.
I took X3 and wire nutted it with X1 and the red Hot wire to my panel. I wire nutted X4, X2 and the white neutral wire to my panel. Thumbs up or down? This is an identical tag as on mine http://cgi.ebay.com/ws/eBayISAPI.dll?VISuperSize&item=270817811556 |
Here is a link that might be useful: Picture of Identical Tag on Transformer
Follow-Up Postings:
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- Posted by ronnatalie (My Page) on Sat, Dec 31, 11 at 21:09
| No! Correct, to run 480 primary, you connect H2 and H3. If you are going to run a 230 primary you'd connect H1 to H2 and H3 to H4. Similarly, if you want the secondary at 240, you connect X2 and X3. |
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- Posted by bus_driver (My Page) on Sat, Dec 31, 11 at 21:51
| I think that Doug has it correct. |
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| It should all be on the nameplate of the transformer. Many even have tables of what connections for input and output combinations he transformer can provide/accept. |
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- Posted by ronnatalie (My Page) on Sun, Jan 1, 12 at 22:17
| He has the primary correct, he needs to do the secondary as I stated. |
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| I think Ronnatalie is right - I'll wirenut my Hot to both X1/X2 wires and my Nuetral to wires labelled X3/X4. Found a square D site showing 3 different ways to wire the secondaries. X1/X2 --- X3/X4 gave just 120. X1-- X2/X3----X4 gave 240 between X1 and X4, but you could also get 120 between X1 and X2/X3 and 120 between X2/X3 and X4. A little confusing for the novice. |
Here is a link that might be useful: Square D site
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- Posted by bus_driver (My Page) on Mon, Jan 2, 12 at 9:44
| The implication in the initial post is that the supply (primary) voltage in this application is 480, one phase of a 480/277 WYE three phase, right? And the desired secondary voltage is 120, right? |
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| This sounds a lot like a commercial application, and only licensed electricians are allowed to do commercial work. |
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| Incoming power to my shop is 480/277 three phase, but I needed 120VAC single phase for a small control panel I added. So I took 2 of the 3 legs to supply the 480 to the little transformer (run through a fuse block to protect the transformer). I'm in the country and there are no inspectors or electricians other than me. Thanks to Ronnatalie. |
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| don't forget a fuse/ circuit breaker on the output of the TX. please measure the voltage before using just to make sure it what you want. are you running the setup isolated? or grounded? -dkenny |
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