Receptacle mounting height

[Smart $]

That is not what it means, 18" A.F.F. means the lowest part not the center.

I disagree...

For an example A.F.F. may also be used for other architectural details such as counter tops, this doesn't mean the center of the counter top thickness, it will mean top or bottom depending on the item.

Yes, an AFF dimension is item dependent.

UON (unless otherwise noted), AFF refers to the point or surface to be used or visualized (as in a dial clock). For example, with countertops, it is to the counter surface. If you were to take an AFF dimension literally for a countertop with integrated backsplash, it would get installed a few inches too low.

While it can be argued upon indefintely, for electrical wall devices the AFF dimension typically refers to center of the device and is based on simplex devices?one device per yoke, such as a traditional wall switch. A switch designated to be installed at 48" AFF means the switch's center of operation is at 48" above finished floor elevation.

 

[celtic]

Hey Celtic, ever get tired of cleaning out your switch boxes from Drywallers mud? Went to 46" top of box for this reason.

Of course....I think we have all experienced this phenomenon.

No matter what height you place a box, there is always a possiblity of a seam falling right on it.

 

[Brady Electric]

Receptacle mounting height

RCaroll has the right idea. I buy everyone Klein stick rules and when you open them up it open's to 13' to top that's where we set our box for outlets and open up to 43' is where we set our switches and that even works for handycap situtations. Like the hammer idea but what if some redneck uses a sledge hammer? Semper Fi

 

[Dave_PE]

FWIW.....the Fair Housing Act for multi-family buildings measures to the center of the device.....it's also grounds for a lawsuit by the "condo police" for failing to comply by mounting devices too low or too high, includes mounting the thermostat at 48" max AFF to the center for those in wheelchairs.