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In Reply to: RE: isolation transformer grounding issue posted by vinnie2 on June 27, 2018 at 05:18:12
Vinnie, That's a really high quality transformer and should work well for most applications. However, I am not clear about what you are suggesting.
What I suggest is that you look closely at the drawing above and follow it exactly. So you would use a three prong grounded plug on the primary, the hot and neutral go to the two inputs. Now you need a female three prong grounded cable on the secondary side.
I would use a high quality extension cord and mid way in the cable, with a sharp knife (like an Exacto), carefully remove the insulation by slicing through the outer layer lengthwise and pealing it off leaving the three conductors exposed. Cut about a six inches to a foot off of the Hot and Neutral conductors, trim each wire and solder the ends to the respective hot and neutral tabs on the primary and secondary side. Now you have the hot and neutral going through the transformer and the intact ground bypassing the transformer.
Follow Ups:
I think I have it about set up that way now (pic attached). The two brown wires connected to the three prong outlet go to the ac output terminals of the transformer and the black and white of the mains cord go to the input terminals of the transformer. The green ground wire with the yellow tab is not connected yet, and I am wondering if I should connect it to one of the bolts of the case so the case is grounded, and then take another wire from the bolt to the ground of the three prong outlet. Your drawing shows the transformer housing grounded on the input side if I am reading it correctly. Is that right? I want to get everything set up right beore I build a case for it.
Edits: 06/27/18 06/27/18 06/27/18 06/27/18 06/27/18 06/27/18 06/27/18 06/27/18
"Your drawing shows the transformer housing grounded on the input side if I am reading it correctly."
The difference is that in your situation you have only a transformer. The drawing assumes there is some metal box housing the transformer. For safety that metal box should be grounded. Further, the ground on the primary side is connected to the ground on the secondary female receptacle and any metal box would be connected to that common ground.
In your photo I see only two wires going into the female receptacle from the secondary: I don't see any connection to the ground. That's not correct. The ground wire from the primary side cable must be connected to the female receptacle ground.
Roger on that. It's hard to see in the photo, but bottom center is the end of a green wire with a yellow terminal on it. That will be connected to the female ground via another wire. Is there any reason why I shouldn't ground the housing of the transformer, or is that totally unnecessary?
Vinnie, I think that a much safer female for the secondary side would be one as illustrated below. You don't need to ground the transformer but put the whole thing in a box or behind a panel with the female connector protruding on a 16 Gauge extension cord cable that has all three wires in a rubber sheath.
Roger on that. That has been the plan all along. Just trying to get the hookup order correct before putting it in an enclosure. Thanks.
"The drawing assumes there is some metal box housing the transformer. For safety that metal box should be grounded."
Vinnie you need to pay attention. Also that Rube Goldburg you have needs to be cleaned up.
Uncle Mike, you need to read my posts before you reply to them. I said I was planning on putting it in a case when I had the wiring right. If I build a wooden case grounding the transformer might be a good idea, that's why I asked. As for the Rube Goldberg part, don't be so quick to jump to conclusions. That is the way I found it at the hamfest. I never said I was planning on leaving it that way.
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Vinnie
You are right, always right, do lovely work and everything you do is spot on correct.
Myself I would be ashamed to post a picture of that kind of work no matter what stage but I'm not the expert you are.
Edits: 06/28/18 06/28/18
What part of "this is the way I found it at the hamfest" did you not understand? I haven't DONE any work yet.
Edits: 06/28/18
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