But NGjockey--you are probably using a balanced center pole grounding scheme I'm guessing--in which case there is no neutral--it really is negative.
Isolation Transformer - Use with Cheater Plug
If you plug equipment into a isolation transformer like a Tripp-lite using cheater plugs, do you still get the shock benefit? I am thinking you are because the transformer is still plugged in the correct, grounded way. But technical knowledge has never been one of my strengths.
(The only way I can prevent loud hum is by using cheater plugs on both my preamp and amp. Plugging them into the Tripp-lite without the cheater plugs did not work.)
(The only way I can prevent loud hum is by using cheater plugs on both my preamp and amp. Plugging them into the Tripp-lite without the cheater plugs did not work.)
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HHawk: I guess you missed Jea48's humour. Yes, you can still get a minor shock. The iso will reduce common mode noise in the AC line and reduce voltage spikes. Sizing is important. For both a preamp and amp, 1 KVA is minimal. You might want to do some search and research into "ground loop" Rives: You guessed right. Shhh. |
A balanced power system is still a grounded AC power system, (60/120Vac). True both 120V legs are ungrounded with a reference from each leg to the grounded neutral of 60V. The neutral is still connected to earth ground per NEC Article 647. ~ ====================== I originally had the pair plugged into the same outlet with the cheater plugs. (I did not have this problem until I replaced my previous power amp.) Without the cheater plugs, the hum is very loud. Hhawk, Are you saying with all the associated equipment, that is connected together by ics, plugged into the same outlet without using ground cheaters you get a loud hum? By Chance do you have a CATV system hooked up to the audio system in any way? |
Thx again. And the humor went over my head - I have no idea what you are talking about :) Jea48 - Yes, without the cheater plugs and even inserted into the same outlet I get the hum. I replaced a Parasound with a McCormack power amp and that started my having this problem. Cheater plugs do solve the problem but I had read where an isolation transformer might solve it as well and there would be no possibility of a nasty shock using that method. It appears from what you guys are telling me, it that I am still better off to have the pair plugged into the Tripp-lite using the cheater plugs than to go back to having the pair plugged directly into the outlet. It reduces the chance of a lethal shock. |
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