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#90996 - 12/21/04 02:09 AM 15/20amp Recepts  
aldav53  Offline
Member
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
Old subject probably but can 15 amp recepticles be used on 20 amp circuits like a kitchen circuit.
I believe 20a recepts are usually used in a dedicated circuit, single or duplex.
15 amp GFI's say they can be used with a 20a feed thru circuit.


The Golden Rule - "The man with the gold makes the rule"

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#90997 - 12/21/04 02:30 AM Re: 15/20amp Recepts  
Norstarr  Offline
Member
Joined: Sep 2004
Posts: 86
Wi
53, A duplex receptacle rated 15 amps can be used on a 20 amp circuit such as in a laundry room for the appliance circuit. You can not use a single 15 amp receptacle on a 20 amp circuit though. It must be rated 20 amp. All duplex receptacles in a kitchen, including the GFI's can be rated 15 amp. Hope this helps.
Ron


#90998 - 12/21/04 03:39 AM Re: 15/20amp Recepts  
SolarPowered  Offline
Member
Joined: Jul 2004
Posts: 625
Palo Alto, CA, USA
Also, a duplex receptacle counts as two receptacles for the purposes of this discussion, so it is OK to have a single, 15 amp, duplex receptacle on a 20 amp circuit.


#90999 - 12/21/04 10:06 AM Re: 15/20amp Recepts  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
See 210.21 and 210.24


Ryan Jackson,
Salt Lake City

#91000 - 12/21/04 04:27 PM Re: 15/20amp Recepts  
DougW  Offline
Member
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
You can always have a smaller (ampacity) receptacle on a larger(ampacity) circuit, but you can't have a larger (ampacity) receptacle on a smaller(ampacity) circuit.


#91001 - 12/21/04 04:40 PM Re: 15/20amp Recepts  
Norstarr  Offline
Member
Joined: Sep 2004
Posts: 86
Wi
DougW, Says who? I think you are quite wrong about that. Maybe if you explain in a little bit more detail it will make sense. According to your statement I can put a 20A 230 volt 3 phase TL receptacle on a 30 Amp 230 volt 3 phase circuit. No way. I'm sure you just used the wrong wording.
Ron


#91002 - 12/21/04 04:46 PM Re: 15/20amp Recepts  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Ron actually you can put a single receptacle of higher ampacity then the circuit it is connected to. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#91003 - 12/21/04 06:15 PM Re: 15/20amp Recepts  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Mr. IWIRE, I am looking for an example where you'd put a higher rated single receptacle on a lower rated individual branch circuit and I'm not finding any. Except for the exceptions in 210.21(B)(1). And I'm not sure that's even an argument in your favor. Please educate me [Linked Image]


George Little

#91004 - 12/21/04 06:47 PM Re: 15/20amp Recepts  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
George that is twice today I have been called Mr.

Please call me Bob [Linked Image]

First I did not say it was a great idea but lets look some of 210.21(B)

Quote
210.21(B) Receptacles.
(1) Single Receptacle on an Individual Branch Circuit. A single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.


Notice they did not say the same rating as the branch circuit or the values in Table 210.21(B)(3).

Now

Quote
210.21(B)(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), or where larger than 50 amperes, the receptacle rating shall not be less than the branch-circuit rating.


IMO it is clear the requirements for single receptacles have nothing to do with Table 210.21(B)(3).

IMO single receptacles and multiple receptacles rated over 50 amps may be supplied with branch circuits rated lower than the receptacle.

I would have to ask what code section prohibits using a single 30 amp receptacle on a 15 amp circuit.

An engineer once wrote in asking if he could feed a 200 amp pin and sleeve receptacle with a 90 amp branch circuit.

No one could find a code section preventing that.

Bob

[This message has been edited by iwire (edited 12-21-2004).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#91005 - 12/21/04 07:41 PM Re: 15/20amp Recepts  
SolarPowered  Offline
Member
Joined: Jul 2004
Posts: 625
Palo Alto, CA, USA
That does actually make sense. A 200 amp receptacle protected by 90 amp fusing will be safe. The reverse would not be--a 90 amp receptacle protected by 200 amp fusing is in danger of being overloaded.

I think that the confusion that arises comes from the concept that a 200 amp load is going to be plugged into a 200 amp receptacle. When you're dealing with plugs and receptacles in excess of 20 amps, that doesn't necessarily follow. The cord, plug and receptacle are normally often selected at the time of installation; they need to be sufficient for the load, but there is no danger in having them too big.

The fusing is normally selected specifically for the load, so there's not really an issue with the receptacle and fusing having different values.

At 20 amps and below, the situation tends to be different. Specifically, if a load is supplied with a cord with a 20 amp plug, it almost certainly draws more current than can legally be supplied by a 15 amp circuit. And 15 and 20 amp circuits are pretty much generic--you find an existing receptacle in the wall, and plug into it. So, if one were to put a 20 amp receptacle on a 15 amp circuit, there is more of a danger that someone will plug in a load that needs a 20 amp circuit.

[This message has been edited by SolarPowered (edited 12-21-2004).]


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