Receptacle Rating

[2SIN54]

Hi and thanks for the opportunity to use this incredible resource!

BTW, I do have the 2011 NEC code book.

Just had a question regarding receptacle ratings. I have watched Mike Holt's video on 15-ampere & 20-ampere rated receptacles being the same internally and the only difference being the face plate etc. Thus, 15-ampere duplex receptacles are allowed to be used on a 20-ampere branch circuits NEC 210.21(B)(3).

Then, in 210.21(B)(1) it says that a "single" receptacle used on an individual branch circuit shall have an ampere rating not less than that of the branch circuit. FYI, I'm disregarding the exceptions there.

So, my question(s) are ~

{A} Per mike's video on the dual rating of 15-ampere rated duplex receptacles, can it be found in writing this is a fact. I agree that this is the case and understand the engineering behind it, I just wondered how to definitively indicate this to someone else who would question the matter.

{B} Does a 15-ampere rated "single" receptacle carry the same dual rating?

{C} Would it be permissible to use two or more 15-ampere rated "single" receptacles on a 20-ampere rated branch circuit?

Thanks

 

[infinity]

(A) The receptacle specification will indicate that it's 20 amp feed through which I would guess is part of the listing of the 15 amp duplex.

(B) I would say no (but it could be) since a single receptacle has only one screw terminal for each conductor and is not used as a feed through.

(C) Yes, also a single duplex is considered two receptacles.

 

[2SIN54]

Yea from what I can find the single's do not indicate a dual rating as most duplexes do. Last time I really dealt with single's was in an older nursing home for AC/heat units in each room, I think we updated them to 20's where they needed replaced.

 

[kwired]

Actual feed thru ratings really only matters when feeding thru.

NEC specifically allows 15 amp receptacles on 20 amp circuits if it is a multi-outlet circuit. One duplex receptacle fulfills that multi-outlet term.