How are wire installations tested for shorts and grounds?

What will be an ideal response?


Wire installations are generally tested for two conditions: shorts and grounds. Shorts are current paths that exist between conductors. To test an installation for shorts, the megohmmeter is connected across two conductors at a time. The circuit is tested at rated voltage or slightly higher. The megohmmeter indicates the resistance between the two conductors. Because both conductors are insulated, the resistance between them should be extremely high. Each conductor should be tested against every other conductor in the installation. To test the installation for grounds, one lead of the megohmmeter is connected to the metallic raceway. The other meter lead is connected to one of the conductors. The conductor should be tested at rated voltage or slightly higher. Each conductor should be tested.

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