-
combo-
"GFIs are not needed for appliances that have three wire grounded cords and on classic appliances they can cause nuisance trips, and for this reason GFIs should NEVER be used for refrigerators and freezers "
True -BUT....
GFI's provide extra protection from shock.
In general, GFIs should be on<span style="text-decoration: underline;"> ALL </span>circuits in our homes. It's like a gold standard of safety at very little cost.
The truth is, on Non GFI circuits, even with a ground, you can easily be shocked to DEATH from a grounded appliance WITHOUT the circuit breaker blowing.
Think about it. If you touched a hot wire on an appliance, the power is going right through you to the ground. The circuit breaker only cares if the draw becomes so much that it reaches amps stated on the breaker, AND THERE IS A DELAY.
You will be long since dead at that point.
With a GFI the circuit would be cut almost instantly. Saving your life.
Yes, some appliances, such as garage door openers, large refrigerators, and washers, may cause "nuisance trips" (not really a good name for a device that will save your life).
These appliances will typically work just fine on a 15 amp circuit WITHOUT a GFI.
Upgrading the circuit (breaker, wire, and outlet) to 20 AMP with 20 AMP GFI should resolve this issue. The reason it trips is because of the split second surge to start the appliance.
Consider that a compressor based appliance can draw up to 6 times its operating wattage, when starting. So if you have a refrig that is using 300 watts when running, when it starts, that first HALF second it is pulling 1800 watts.
On a 15 amp circuit, that is technically enough to blow the breaker. Breakers have a delay feature that keeps them for blowing for about 60 seconds, that is why they don't typically blow.
A GFI does NOT have a delay for obvious reasons.
So, plug that frig into a 20 amp GFI protected outlet to get the full power needed to start without fear that it will trip.
I have nearly been shocked at least 2 times when messing with appliances. Thank goodness the appliances were grounded, but I could feel the tingle on the wet appliances ( I was a teen at the time and they were not GFI protected).
-
MattL-
"Only one GFI is needed"
TRUE,
If one were going to install just one circuit that is what you need.
The original drawing shows 12/3 Romex , intending there to be 2 separate circuits. This which will in fact require 2 GFIs. I intended to have every other outlet on the line, on a separate circuit.
But I drew it wrong. Having every other outlet on a separate circuit in a work area is a good idea, BUT, when doing GFI circuits, you CAN NOT share any of the conductors with another circuit, such as when doing split wiring for switched outlets where you can share the neutral and the ground.
One would need to have a separate set of wires run for each circuit.
I've modified the electrical part of the drawing:
[this post was last edited: 11/21/2013-04:11]
