How can I see if an armored cable is down to earth?

Md Ariful Islam

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Dr. Md Rushad Rahman

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Grounded electrical systems, like those found in most commercial and nearly all residential buildings, work on three (or more) wire circuits, one each for hot (line), neutral (grounded) and ground, or earth (grounding). When checking energized circuits, the voltage read on a meter between the line and grounded conductors should be identical to those read between the line and grounding conductors. Unenergized circuits may be measured for a very low (less than one ohm) resistance with an ohm meter connected between grounded and grounding conductors, as these individual conductors originate from the same place in the main electrical panel.

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