marley120993
Member
- Location
- milford ct
can you install a20amp gfci on a 15 a circuit for a garbage disposal
15 amp circiuts
- Thread starter marley120993
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- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Nope. See table 210.21(B)(3).
Welcome to the forum.
Welcome to the forum.
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
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- ESI, PI, RBO
- Location
- New Jersey
- Occupation
- Journeyman Electrician
You could if you can find a single 20 amp GFCI receptacle. 
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Uhhhh, I think not Rob. Take a look at the table I mention earlier. For a 15 amp circuit, you can't have outlets rated above 15 amps. Perhaps you are thinking about having a pair of 15 amp receptacles on a 20 amp circuit?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Your table is for 2 or more receptacles.
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
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- ESI, PI, RBO
- Location
- New Jersey
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- Journeyman Electrician
You didn't read the section above the table.
- Location
- Illinois
- Occupation
- retired electrician
The charging statement for the use of Table 210.21(B)(3) is in 210.21(B)(3) and says:
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
The table applies to single receptacles because it allows me to place a single 15 AMP rec. on a 20 AMP circuit and prohibits me from putting a single 20 AMP rec. on a 15 AMP circuit.
(B) Receptacles.
(B) Receptacles.
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
He has a disposal and I'll bet that it has a switch.
(3) Receptacle Ratings. Where connected to a branch circuit
supplying two or more receptacles or outlets,
(3) Receptacle Ratings. Where connected to a branch circuit
supplying two or more receptacles or outlets,
- Location
- Illinois
- Occupation
- retired electrician
The table does not permit a single 15 amp receptacle on a 20 amp branch circuit. 210.21(B)(1) permits a single 20 amp receptacle on a 15 amp circuit. If Table 210.15(B)(3) applied to single receptacles it would be in conflict with the rule in 210.21(B)(1).
- Location
- Illinois
- Occupation
- retired electrician
What are you trying to tell me with this post? I don't understand.
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
marley120993, perhaps you could let us know whether the circuit in question supplies loads other than the garbage disposal, and whether the receptacle you intend to install is a simplex or a duplex?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
You have it backwards. And the table does not apply to single receptacles.
J.P.
Senior Member
- Location
- United States
Do you need a GFCI on a disposal anyway? It's under the counter and most of them are switched above the counter.
I would think ( without actually knowing ) you could put a higher rated recep on a lower rated circuit. Not on stuff like 30A twist locks , but regular receps? why not?
Just don't go the other way and use a 15 as the sole recep on a 20a circuit.
I as confused by some of the answers you got honestly.
I would think ( without actually knowing ) you could put a higher rated recep on a lower rated circuit. Not on stuff like 30A twist locks , but regular receps? why not?
Just don't go the other way and use a 15 as the sole recep on a 20a circuit.
I as confused by some of the answers you got honestly.
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
I screw this one up all the time.
Talk/walk me through it because I know it but then I read this section and it makes me change my mind. :rant:
No Article messes me up more than this one! 210.21(B)
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
I know you guys know what an outlet is but:
Outlet. A point on the wiring system at which current is
taken to supply utilization equipment.
Branch circuit goes to the switch outlet then the receptacle outlet I have two or more outlets.
(3) Receptacle Ratings. Where connected to a branch circuit
supplying two or more receptacles or outlets, receptacle
ratings shall conform to the values listed in Table
210.21(B)(3),
- Location
- Connecticut
- Occupation
- Engineer
In what you described, the switch is not an outlet, the receptacle is. The current is supplied to the utilization equipment at the receptacle, it only passes through the switch.
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