Quoted:
Quoted:
Quoted: I got shocked a few times when I used an amp that was not grounded. Didn't hurt, but you did feel it when you grounded yourself through your mic. Turns out it was a power strip that someone had cut the ground pin off of.
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Sorry but I don't buy that. Neutral and ground are the same potential. There was another problem if you got shocked that easily.
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Not necessarily so. Ground and neutral are NOT the same. I see 120 VAC circuts in industry all the time that are not grounded properly, steped down in equipent cabinets from 480 to use as control voltage or any other use. Not to mention DC voltage in 24 VDC apps that will drag down (crowbar is an old term) if you ground neutral. But I digress. Its still possible to have a poor ground in a home and a good neutral from what the IBEW types tell me. Im strictly industrial.
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It sounds like what you're describing is either old, ungrounded systems. I work on industrial equipment every day and I can't say that I've ever ran a 120 volt circuit where N did not = Ground but, I work in a fairly new building where EVERYTHING is grounded, and of course Chicago has some of the most restrictive code in existance. They are seperate on the branch circuit side of the service because code requires it. Back at the service, they're tied together at a specific point that another guy here refers to as that the "Neutral is bonded to the ground at ..."
I'm not sure what you're referring to if you're talking about DC circuits but I'm not going to go there as it has nothing to do with this topic.
120 in an industrial environment has to come off of a transformer if it was once 480. Remember that the number "120" refers to the voltage from that line to ground. 480 is typically 480 line to line and 277 to ground in my building. Transformers will step this down to 208/120 if it's not going to be used as-is (at 480/277). After the transformer, on the secondary side, it must be grounded somewhere! This is because a transformer does not actually allow an "Electrical" connection between the primary and secondary windings...the connection is purely magnetic. What you might have experienced is someone installing a transformer without grounding the secondary side, which is not right.
Ultimately, any white wire in the building should be the same potential as ground. If there is any difference at all, you have a problem somewhere, no question.
We can go back and forth all day about the potential places for where you could possibly lose that connection, but I'm pretty sure it's a widely accepted fact that for the purposes of a voltage measurement, N = G.