I installed (3) 20 amp duplex receptacles using 12/2 wg romex on its own 20
amp breaker/circuit in my wood shop with the first one being GFI. The
problem I am having is that the GFI always trips when I turn the breaker on.
I want to stress that there is NO shorts in any of the connected outlets.
The panel is a 100 amp sub panel connected to the main 200 amp panel which
is grounded to an outside ground rod and also to the cold water pipe. When I
removed the GFI and installed another 20 amp duplex receptacle everything
worked OK and the 20 amp panel breaker did not pop. How can I stop the GFI
from tripping if I reinstall it?
Thanks for your help.
I'm surprise the gfci recp even reset with the breaker open. After
you close the breaker, and you hear the gfci recep trip, can you reset
the gfci recept?
BTW, not being fresh, re-read the gfci repts installation instructions
and make sure you are installing the wires correctly. I think if you
wire the line and load conductors backwards, gfci recepts will auto
trip and fail to reset. And if all else fails a qualified electrician
should be a resource for services and information.
Tell us what happened after you try again.
tom @ www.FindMeShelter.com
I had to turn the 20 amp breaker off at the sub panel before I reset the
GFI. Every time I reset the GFI and turned the breaker on it would trip, and
yes I do have the 2 neutrals connected to the silver screws and the 2 black
ones to the gold screws on both recps. I forgot to tell you all in my
original post that I installed 2 circuits with GFI's not just one and they
both trip when the breaker is turned on, but work OK with ordinary 20 amp
duplex recps. I noticed that on my sub panel there is no main 100 amp
breaker. The 100 amp breaker is located in the main 200 amp panel. Do you
think if I ran a ground wire from the sub panel to the cold water pipe it
would solve the problem? Thanks again for your help.
I still don't see an issue, if everything is wired correctly, the fact
that the gfci's trip when you close the breaker is a non-issue. I
mean how often are you going to cycle that breaker?
"Doctor, it hurts when I do this. Then don't do that."
Now you mentioned something about running a ground, isn't this a
grounded system? If NOT, then your gfci's should have nothing
attached to the ground screw, and should be marked as not having an
equipment grounding capiblity. As for your sub, it should be grounded
to your main panel(in most cases), do you have a grounded main?
Does the gfci, reset?
tom @ www.URLBee.com
As others indicated, make sure the wires from your breaker are
connected to the LINE terminals and the wires to your 'downstream'
outlets are connected to the LOAD terminals. You could have
"mixed and matched."
One set of screws is marked line and one set is marked load. The black
and white wires that you connect to the line terminals must be the ones
that come from the circuit breaker panel's cabinet. Both of the wires
that are connected to the load terminals must go to the other
receptacles that are to be protected by that particular GFCI. If either
or both colors are reversed it would cause the GFCI to trip when you
apply power by closing the breaker. It is not just that you have the
white wire on the silver terminal and the black wire on the brass
terminal. You must have them on the correct line and load terminals.
Once you have rechecked the terminals on the GFCI receptacle and found
them correct you will have to disconnect the wiring from the load
terminals and apply a good meter or a high impedance continuity checker
between the Equipment Grounding Conductor (EGC) and the hot and neutral.
There must be no measurable continuity between the EGC and the two
current carrying conductors. If you find any measurable level of
contact then that contact must be found and cleared.
Try disconnecting the "Load" wires from the GFI receptacle and see what
happens when you turn on the circuit breaker. If the GFI does not trip,
then you have a problem downstream. If it continues to trip, I suggest that
you double check how you have the GFI wired. The feed from the circuit
breaker should be on the line side.
If it turns out that you have a problem downstream check the following:
Make sure that no bare ground wires are touching the neutral screws on the
receptacles, make sure that you did not over tighten the wire clamps on the
boxes if you used metal, make sure that no staples are squeezing the wire
too tightly, and make sure that there is no moisture on any of the
You might want to check that the bonding screw in the
sub-panel has been removed. Since this panel is wired from
the main 200 amp panel the bonding screw has to be removed
so that there is only one connection between the neutral and
ground which is already in the main panel.
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