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Last question.
What is the correct term I should use to describe removing residual electricity from a device?
Assume we are talking about a VFD or something with capacitors.
Snubbing? Draining?
Chuck
Burbank, CA
Or a space shuttle or even as common as an automobile.Err, no. Grounding is not the fix. Systems with IT earthing exist, where the live conductors are not earth referenced. For an extreme example, consider aircraft.
Or a space shuttle or even as common as an automobile.
For certain floating ground control systems exist in machine tools.
Ground is not earth.
Bob
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What is the correct term I should use to describe removing residual electricity from a device?
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It is with respect to most power systems covered by the NEC.
In case of innards of a device, then it is incorrect to refer to "ground" unless it is referenced to the power ground. In such a case of a "floating" circuit, "circuit common", or similar terms ought to be used.
The common terms are "Earth ground" or "Chassis ground". In typical use "ground" just means 0 volts.
Maybe it shouldn't be that way, but it has been for a very long time.
Eh, the schematic is wrong or right. If the wire is isolated, and has a ground symbol on the schematic, the schematic is wrong.
Wow. Rough crowd.
In my working days we had upwards of 100 journeyman electricians in our plant and one thing that I learned from them was that if there was any doubt you checked it with a meter. A transformer with no power to it isn't a problem but one with wires going to it needs to be checked with a meter. Anything that may have capacitors or batteries must be checked. Just assuming that something is dead is a good way to die.
A) Use the Ohms scale or the Diode test scale or the continuity buzzer/horn.
B) WTF are you doing with your experience still wandering about with only ONE meter?
I won't go to the field with fewer that two, usually have a scope plus three on the bench, if not two scopes.
It's just easier than playing one-probe hopalong in a multivariate environment.
Kinda like the randy mouse as took a lady giraffe as a lover.
Between shagging, teasing tit, licking ears, and french kissing, poor bastard ran himself half to death.
One brief word of advise: don't use inexpensive, general pupose multi-meters for testing power circuits. Use the correct wigger type testers designed for this.
Bad stuff happens when you stick an old simpson meter, accidententally set to the wrong range, across some main lugs on a panelboard. 'Nuff said.
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