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#1
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Combining GFCI Breaker and Receptacle in the same circuit
I am re-wiring my main bathroom and putting in an exhaust fan unit
too. The bathroom has always been on a common lighting circuit and I'm putting it on it's own 20AMP circuit now. I have a GFCI breaker installed at the panel (I figure that this is a good thing)? I have had a GFCI receptacle over the sink area. Is it still a good idea to keep this receptacle as a GFCI, should I change it out for a standard duplex? Is there a code reason to keep or remove one of these devices from the same circuit? It seems redundant to me to have both these GFCI devices in the same line, and I also don't know that it's safe. |
#2
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"Jim Woodward" wrote in message om... I am re-wiring my main bathroom and putting in an exhaust fan unit too. The bathroom has always been on a common lighting circuit and I'm putting it on it's own 20AMP circuit now. I have a GFCI breaker installed at the panel (I figure that this is a good thing)? I have had a GFCI receptacle over the sink area. Is it still a good idea to keep this receptacle as a GFCI, should I change it out for a standard duplex? Is there a code reason to keep or remove one of these devices from the same circuit? It seems redundant to me to have both these GFCI devices in the same line, and I also don't know that it's safe. It's "safe" but it can be a PITA if you trip it. So long as you remember that you have the GFCIs in "series" then you should be OK. (IOW: when the local power goes off you attempt to reset the local GFCI and then go back to the main panel and reset then and THEN go back to the local GFCI.) I believe the "test" function of the local GFCI should not trip any "upstream" ground fault detector. I would let it be. When the local GFCI fails a test then replace it with a normal outlet (but TEST with a GFCI tester to ensure that the panel GFCI truly works.) |
#3
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Perfectly safe, but why not use the breaker on another circuit?
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#4
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In misc.consumers.house Jim Woodward wrote:
I am re-wiring my main bathroom and putting in an exhaust fan unit too. The bathroom has always been on a common lighting circuit and I'm putting it on it's own 20AMP circuit now. I have a GFCI breaker installed at the panel (I figure that this is a good thing)? I have had a GFCI receptacle over the sink area. Is it still a good idea to keep this receptacle as a GFCI, should I change it out for a standard duplex? Is there a code reason to keep or remove one of these devices from the same circuit? It seems redundant to me to have both these GFCI devices in the same line, and I also don't know that it's safe. Personally, if you are going to wire the light to the same circuit as the outlet, I would forget the GFCI at the breaker and just keep the outlet GFCI. Then, wire the light *before* the GFCI in the circuit so that if you trip the GFCI you don't find yourself in the dark. Though really, I'd leave the light on the general lighting circuit and use the new circuit for the fan and outlet only. Then you can keep the GFCI at the breaker box and if it trips you only cut off the fan and not the light. Bill Ranck Blacksburg, Va. |
#5
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According to John Gilmer :
"Jim Woodward" wrote in message om... I am re-wiring my main bathroom and putting in an exhaust fan unit too. The bathroom has always been on a common lighting circuit and I'm putting it on it's own 20AMP circuit now. I have a GFCI breaker installed at the panel (I figure that this is a good thing)? I have had a GFCI receptacle over the sink area. Is it still a good idea to keep this receptacle as a GFCI, should I change it out for a standard duplex? Is there a code reason to keep or remove one of these devices from the same circuit? It seems redundant to me to have both these GFCI devices in the same line, and I also don't know that it's safe. It's "safe" but it can be a PITA if you trip it. So long as you remember that you have the GFCIs in "series" then you should be OK. (IOW: when the local power goes off you attempt to reset the local GFCI and then go back to the main panel and reset then and THEN go back to the local GFCI.) I believe the "test" function of the local GFCI should not trip any "upstream" ground fault detector. It could trip _either_ one (or even both), depending on which one trips faster. The test button is essentially coupling a resistor from the the line side of one conductor to the load side of the other, to force a (small) imbalance. If you had a GFI outlet downstream of an AFCI breaker, on the other hand, it'll probably be the outlet to trip. AFCI's do have a GFCI "feature", but its sensitivity is around 30ma, and the outlet's sensitivity is 3-5ma, so the outlet will probably trip faster. I would let it be. When the local GFCI fails a test then replace it with a normal outlet (but TEST with a GFCI tester to ensure that the panel GFCI truly works.) Whether you remove one or the other is really more of a "operational consideration". It's safer than a single one (if one fails, you still have the other), but reenabling it will be more confusing. If you were going to remove one, remove the GFI outlet. Because the GFI breaker (probably) protects more and is (probably) inherently less likely to fail. -- Chris Lewis, Una confibula non set est It's not just anyone who gets a Starship Cruiser class named after them. |
#6
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It could trip _either_ one (or even both), depending on which one trips faster. The test button is essentially coupling a resistor from the the line side of one conductor to the load side of the other, to force a (small) imbalance. Think about it. That would not create an un-balance up stream. It just trips the unit being tested. Now were the "test" button to cross a power conductor to ground .... (That's why a manual tester is used in addition to the "test" button: it actually creates a ground fault. The "built in" test only simulates the fault. If you had a GFI outlet downstream of an AFCI breaker, on the other hand, it'll probably be the outlet to trip. AFCI's do have a GFCI "feature", but its sensitivity is around 30ma, and the outlet's sensitivity is 3-5ma, so the outlet will probably trip faster. I would let it be. When the local GFCI fails a test then replace it with a normal outlet (but TEST with a GFCI tester to ensure that the panel GFCI truly works.) Whether you remove one or the other is really more of a "operational consideration". It's safer than a single one (if one fails, you still have the other), but reenabling it will be more confusing. If you were going to remove one, remove the GFI outlet. Because the GFI breaker (probably) protects more and is (probably) inherently less likely to fail. -- Chris Lewis, Una confibula non set est It's not just anyone who gets a Starship Cruiser class named after them. |
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