If you want a quick test to see if the earth is good or not, your voltmeter
will do (on AC mode). Just stick one lead into the live socket and the other
into the ground socket. If it reads the same as when measured between live
and neutral, then your ground is good. Alternatively, if you measure more
than a few volts between the ground and neutral, then the ground is not good.
Here's another test you can try that gives you a little more confidence in
determining if you have a good ground. If your voltmeter contains an ohmeter
(most multimeters do), then try measuring the resistance between the
questionable ground and another known good ground (found at another location
- preferably a circuit breaker panel on bare steel). If the resistance is
only a few ohms (< 10 ohms from the long meter test lead resistances), then
your ground is probably good. Before you do this test, check the voltage
first, so you don't damage your meter. To get the extra meter lead distance
required to measure between these distant points, you can use an extension
cord.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=44659&t=44558
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