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Ground on PT Primary?
Posted: Mon 04/30/07 5:23 pm
by Deric
I found a new in box PT at an electronics repair shop that is shutting it's doors. The primary has 2 black wires and an Orange ground wire. I haven't run accross a ground on the primary before. Is this common? Should I "ground" it or.....?
Thanks
Posted: Mon 04/30/07 5:49 pm
by what_wires
Measure the resistance between the orange wire and the frame of the transformer. If it isn't connected to the frame, I would just tape it off.
Posted: Mon 04/30/07 9:51 pm
by zaphod_phil
Yes, some high quality PTs have a Faraday shield like that.
Posted: Tue 05/01/07 12:41 am
by Deric
I Googled the number on the bottom of the PT and found this...
http://www.tubesandmore.com/scripts/fox ... =P-TF22723
Posted: Tue 05/01/07 1:50 am
by bigsbybender
That would be the tap for the Faraday shield....I've found that a lot of replacement PT's have them....you can ground it with the secondary Center Tap...or any other convenient place.
j.
Posted: Tue 05/01/07 10:27 am
by Deric
Thanks for the help guys!!!
