I am planning on getting some glass block windows installed in my second
floor shower window. I would like to extend a lead to the window area so
the glass block window vent fan could have power. Is there an easy way to
determine if there is a ground in the existing shower light fixture -
without removing the canister. I don't think I should provide power to a
shower fan without there being a good ground circuit.
Can ground be tested for with a simple volt-ohm meter?
The house is 50 years old and has some ground circuits.
I love the Lord but am not ready to meet Him yet.
Thanks for the info. I found that there was a ground between the tongue of
the socket and the canister. Also, it appears the hot lead is always
"available" as the white neutral is controlled thru the switch. I decided
to not put a powered fan in the glass block after all, but I will get a GFCI
protector on that circuit. Thanks again.
AFIK a so called 'Ground Fault Circuit Interrupter' operates when
there is an unbalance (difference) in the amount of current flowing in
the neutral and live wires through the GFCI. The unbalance can be due
to a leakage to ground through a faulty device on the circit beyond
(downstream) of the GFCI or it may occur if I stick my fingers
stupidly into something live while standing on a damp garage floor or
So while it MAY be a ground fault something else can cause such
imbalance. In some countries AFIK (stand to be corrected) the devices
are called RCDs, Rapid Disconnect Device?
AIUI one reason that GFCIs not recommended for use on fridges and
other domestic motor start circuits is that unbalances can occur when
starting due to capacitance to motor frame and other reactances in the
AC circuit. So you come home to a fridge full of rotten food!
Summary: AIUI GFCIs do not detect leakage current to ground, per se.
They detect unbalance between live and neutral at or beyond the GFCI
equipped outlet which MAY be due to leakage to ground.
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