[swimmer]

I sometimes encounter "single-plex" receptacles in garages of newer houses.
Does this have something to do with 210.21(B)(1)
Does it have something to do with dedicated laundry circuits? Though I do not recall seeing plumbing adjacent to these outlets.

210.21(B)(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.

I also saw this on a Mike Holt forum but I think the article number is wrong:
Receptacles. You can use 15A or 20A receptacles on 20A circuits as long as there is more than one receptacle on the circuit. For these purposes, a duplex receptacle is considered to be two receptacles [210.21(B)(3)].

 

[480sparky]

Dedicated central vac receps.

 

[Speedy Petey]

It's from guys who still think the GFI exception exists.

 

[Southeast Power]

Dedicated central vac receps.

Could be for a beer fridge or freezer.

 

[Semi-Ret Electrician]

I sometimes encounter "single-plex" receptacles in garages of newer houses.
Does this have something to do with 210.21(B)(1)
Does it have something to do with dedicated laundry circuits? Though I do not recall seeing plumbing adjacent to these outlets.

210.21(B)(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.

I also saw this on a Mike Holt forum but I think the article number is wrong:
Receptacles. You can use 15A or 20A receptacles on 20A circuits as long as there is more than one receptacle on the circuit. For these purposes, a duplex receptacle is considered to be two receptacles [210.21(B)(3)].

A single receptacle installed on an individual branch circuit must have an ampere rating not less than that of the branch circuit. For example, a single receptacle on a 20-ampere individual branch circuit must be rated at 20 amperes in accordance with 210.21(B)(1); however, two or more 15-ampere single receptacles or a 15-ampere duplex receptacle are permitted on a 20-ampere branch circuit in accordance with 210.21(B)(3).

 

[swimmer]

Could be for a beer fridge or freezer.

All 2 or 3 of these I've encountered have been original equipment on tract houses built after 1998.

 

[Deep Cover]

During that time frame, there were exceptions for single recepts and GFI protection. I don't have anything earlier than the '08 on my computer so I cannot quote you the exact exceptions.

 

[swimmer]

It's from guys who still think the GFI exception exists.

A general contractor once told me something about the GFI exception. I couldn't find anything to back up his claim.

 

[Deep Cover]

From the 05

Exception 1

Receptacles that are not readily accessible.

Exception 2

A single recept or a duplex recept for two appliances located within dedicated space for each appliance that, in normal use, is not easily moved from one place to another and that is cord-plug connected.

These exceptions specifically for garages and basements.

 

[Speedy Petey]

A general contractor once told me something about the GFI exception. I couldn't find anything to back up his claim.

Depends on what you consider a "newer" house.
I take this as something only a few years old.
The exception was last in the 2005 NEC as Deep quoted.

 

[crazyboy]

It's from guys who still think the GFI exception exists.

It does here. :thumbup:

 

[24hrsparkey]

We used to use a single for a one on one plug in , for the gfi exception. Example : garage door opener ect ect
I take it in the newer resi code it's no longer that way ?

 

[mart6992]

those are probably "freezer plugs", as we call them locally, which are part of the exception

 

[Jim Port]

The exception for simplex receptacles without GFI protection was removed. Now all garage receptacles require GFI protection including the garage door opener.

 

[24hrsparkey]

Bingo. ( that's exactly what I would have guessed)

Thank you .