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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Part 2: Ground is the wrong term today. posted by danlaudionut on April 26, 2007 at 16:39:13:
needs an three wire plug by law."I don't understand all the electrical laws in every state and region and every country as well.
But, I have a CD player that has an all metal case and has the obligatory three wire plug, but it only uses hot and neutral inside the box. The ground connection is unconnected. The manufacturer passes the law by double insulating the mains on the wires going to the power transformer primaries even with a metal case. They just add another layer of plastic insulation over the standard mains wire. Apparently, this is good enough by today's electrical codes.
The output signals of the CD player appear to be just floating. I guess the outer box is connected to circuit common. When connected to an amp that has its circuit common connected to Earth ground, then the whole system is shielded by ground potential.
It sounds best to have only one box grounded to Earth ground to avoid ground loops. Apparently it can still be done legally. My CD player is an Ayre, made today in the USA, and I know they know what they're doing.
Kurt
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Follow Ups
- "That is why anything with a metal case... - kurt s 08:54:15 04/27/07 (4)
- Re: "That is why anything with a metal case... - danlaudionut 10:21:29 04/27/07 (3)
- Dan... - Henry Pasternack 18:46:37 04/27/07 (2)
- Re: Dan... - danlaudionut 20:36:53 04/27/07 (1)
- Unfortunately, - kurt s 21:10:10 04/27/07 (0)
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