"Pszemol" wrote in message
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"George" wrote in message
news:7PSee.61138$WI3.45634@attbi_s71...
"Pszemol" wrote in message
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"Russ J." wrote in message
. ..
I am installing a GFCI this weekend.
I will then see what measurments I get.

I do not expect GFCI doing any miracles with your measurments.

A GFCI monitors the amount of current flowing from hot to neutral. If there
is any imbalance, it trips the circuit. It is able to sense a mismatch as
small as 4 or 5 milliamps, and it can react as quickly as one-thirtieth of a
second. It will prevent the tank from going "live". If any appliances are
leaking current, it will let you know, and won't let the voltage flow again
until the problem is fixed. Anyone not using them is asking for trouble. In
many cities, they are now required in bathrooms or anywhere where there are
live wires and water. Once enough aquarium enthusiasts get zapped, expect
regulations to change for this industry as well.

Hm... I do not advocate agains the GFCI.
I just said I do not expect it doing any change to his measurements!

If you read the whole thread you would found out he measured 48VAC
between tank water column and the cooper pipes for tap water...
I just know voltage measurements of this kind are worthless.
Yes, very similar to pH measurements of RO/DI water... ;-)

It will, in fact change his measurements completely, because 48 VAC will likely
carry significant amperage (more than 4 or 5 milliamps), which is more than
enough to trip the GFCI, and completely shut down everything. So after this
happens, he shouldn't read any voltage, and definitely no amperage.