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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: I did the same... posted by Jack D II on June 4, 2015 at 17:29:33:
"For a test disconnect your homemade Aux grounding system from the wall duplex receptacle as well the dedicated branch circuit safety equipment grounding conductor from the receptacle. (Disconnecting, floating, the safety equipment grounding conductor for testing purposes only.)
Turn on your audio system and sit down for a listen. I would be willing to bet it will sound the same as you were hearing with your elaborate, but dangerous, grounding scheme."
jea48
I have no idea what the "dedicated branch circuit safety equipment" is. It is a MAJOR operation to get behind my two equipment stands, through the maze of wires, power conditioner and Tripplite "brown-out" protector and then to the outlet box. I avoid that like the plague. I am electricall challanged(to be kind).
Jack D III have no idea what the "dedicated branch circuit safety equipment"
You said in an earlier post you have a 20 amp circuit that is for your audio equipment. If the circuit is dedicated for the audio equipment only then it is called a dedicated 20 amp branch circuit. The make up of the circuit consists of a Hot conductor wire, a neutral conductor wire, and a safety equipment grounding conductor wire.
* The Hot wire, usually black in color, is connected to a 20 amp branch circuit breaker in the electrical panel. The other end of the Hot wire connects to the copper or brass color screw on the wall duplex receptacle.
* The neutral wire, white in color, connects to the neutral/ground bar in the electrical panel. The other end of the white neutral conductor wire connects to the silver color terminal screw on the duplex receptacle. (The neutral conductor is at ground potential.)
* The safety equipment grounding conductor, green in color or bare, connects to the neutral/ground bar in the electrical panel. The other end of the wire connects to the green equipment ground screw on the wall duplex receptacle. The purpose of the safety equipment grounding conductor is to carry any ground fault current safely back to the source, the electrical panel. If the ground fault current is high, hopefully, the branch circuit breaker will trip open....
(If the electrical panel is a Sub Panel the neutral bar will be insulated from the metal enclosure and only neutral conductors will terminate to it. A separate ground bar will be bonded to the metal enclosure of the sub panel and all safety equipment grounding conductors will terminate to it.)It is the safety equipment grounding conductor wire that is in question here.
You said the guy that rewired the safety equipment grounding conductor wire was an electrician. IF he is a State Licensed Electrician he would never had defeated the safety equipment grounding conductor wire from terminating directly to the green equipment ground screw on the duplex receptacle. IF he indeed is a licensed electrician I think you misunderstood how he wired in the Auxiliary grounding electrode system wiring to and from from the 2 ground rods. Even if he wired the Aux earthed grounding per Code you still take the chance of frying your audio equipment in the event of a nearby lightning strike."I left out one inportant note. The wire that came off my outlet went to the first ground rod then in an uninterrupted run to the second ground rod. The wire was continuous.
Jack D IIThe first wire used was plain , small copper wire vinyl coated. The effective wire is 18 gage teflon coated silver(over copper?)stranded (19strands), pastel blue with two black bands on one of the two main strands.
Jack D II
IF the guy disconnected the safety equipment grounding wire, (that comes from the electrical panel), from the green equipment ground terminal on the duplex receptacle and rerouted the wire outside to one of the 2 ground rods, then to the next ground rod, and then from the second ground rod back to the equipment ground terminal screw on the duplex receptacle that is dangerous and against code. Worse yet if the return wire from the second ground rod is only a # 18 awg wire. You have zero ground fault protection in the event of a HOT to chassis fault. Same goes for a HOT to equipment ground wire fault in a plug/IEC and cord assembly.
In the event of a ground fault the #18 wire will melt like a fuse. Or worse yet turn cherry red and possibly start a fire. At any rate the 20 amp breaker back at the electrical panel will never trip open.If the guy wired the Aux grounding this second way you need to hire a qualified licensed electrician and have it rewired correctly.
Jim
Edits: 06/05/15 06/05/15 06/05/15
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- RE: I did the same... - jea48 12:10:30 06/05/15 (0)
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