For years there has been a critical demand within the sign industry for a book on the structural engineering of signs. This comprehensive text more than meets that demand -- it exceeds it. Sign companies, ...
Just installed a CPX 90/30 Trans, dated 4-10 replacement for a France Dated 6-1984 transformer. The new CPX was fried with in a week. Tar leaking out and dead!
So we replaced it again with the Allanson CPX 90/30 just got a call the same part of the sign is out again.
Is this case of a bad case? Load side is wired correctly.
They had told us they had an electrician come out to install a ground fault breaker and check line side wiring. I saw that they installed a GFI receptacle with a reset, at the sign.
Am I missing something here? Or is it a bad case of transformers?
Any thoughts on this nagging pain. Are there any other low profile transformers available?
Did you enjoy this article? Click here to subscribe to the magazine.
Hello Neongun
one problem could be that the sign is wired as a series which worked for the 1984 transformer and todays transformers are a GFI set up, and need to wired as a mid-point ..are these clear red units? if so the GFI of today do not put out what thay say they are only good for 80% of there listed size so you might have to up one size transformer and still wire as a mid-point ground it is a simple field fix just find center of the letters on that trans,cut the jump there that will go to the hot side of the new trans now. the GTO cable that was hooked to hot side of the old transformer goes back to the mid-point lug on the new GFI transformer. check all old GTO cable for shorts or just replace it GTO is cheap.. riding back and forth to the same job gets expensive plus it makes you look like an idiot to your customer.. the sign sounds like it is 30 years old.
NSW Systems LLC.