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Old 12-14-2011, 01:02 PM   #1
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When you see a receptacle on a plan that says 40" AFF, do you measure to the top, center of bottom of box?
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Old 12-14-2011, 01:07 PM   #2
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When you see a receptacle on a plan that says 40" AFF, do you measure to the top, center of bottom of box?
It depends on the designer/ engineer/architect. I would consider that measurement to the bottom unless they specify center. Somewhere on the plan it may say all measurements to center. I would definitely call as I bet most designers mean the center.
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Old 12-14-2011, 01:51 PM   #3
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I always use the center unless I am told otherwise.
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Old 12-14-2011, 02:04 PM   #4
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I have always measured to the bottom of the box unless, as already pointed out, there is a spec or general note saying otherwise.

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Old 12-14-2011, 02:12 PM   #5
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Quote:
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I always use the center unless I am told otherwise.
44" to the center would not be 44" aff
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Old 12-14-2011, 04:05 PM   #6
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I used to consider it center till I got burned on a job last year for it >.<
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Old 12-14-2011, 04:22 PM   #7
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44" to the center would not be 44" aff

Especially if they had cabinets or equipment that was 43" high.
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Old 12-14-2011, 04:37 PM   #8
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There is really no way to know how different folks in different parts of the world view this. Again I say call the architect or whoever is in charge.
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Old 12-14-2011, 04:38 PM   #9
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Always considered aff to be center of box unless otherwise noted. But after hearing this I might reconsider next job
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Old 12-14-2011, 04:39 PM   #10
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Quote:
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44" to the center would not be 44" aff
I do believe that is the answer.

Plain as day, why didn't I think of that?
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Old 12-14-2011, 04:41 PM   #11
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There is really no way to know how different folks in different parts of the world view this. Again I say call the architect or whoever is in charge.


Exactly, it isn't worth moving them after if you interpret wrong.
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Old 12-14-2011, 05:20 PM   #12
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I do believe that is the answer.

Plain as day, why didn't I think of that?
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Exactly, it isn't worth moving them after if you interpret wrong.

IMO, I don't think there is anything to interpret. If you set the box at 44" to the center, it is plainly not 44" above the floor. It would be around 42". I don't see how there is anything to interpret.
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Old 12-14-2011, 05:22 PM   #13
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I always do to the bottom of the box.
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Old 12-14-2011, 05:31 PM   #14
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Center here, and I always check all job specs. on the plans, and to reassure i ask in the job meetings, it makes it easier to align the P-ring with a center mark
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Old 12-14-2011, 05:41 PM   #15
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We Always go to bottom.
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Old 12-14-2011, 06:06 PM   #16
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What about wall sconces where an architect may want to specify the center of the fixture?
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Old 12-14-2011, 06:08 PM   #17
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I would review the architectural drawings as with counter height receptacles there is usually a millwork detail. When in doubt it never hurts to send an RFI (request for Information) out to verify the height. It is always best to get this in writing vs calling an architect as it can save you from costly mistakes.
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Old 12-14-2011, 06:35 PM   #18
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when i worked from plans that just said 44 AFF it was always to the bottom of the box had a very "new' EE working on a COE job Fort Cambell that said we needed to lower our boxes because she said 44 AFF meant to the bottom of the receptacle.
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Old 12-14-2011, 07:18 PM   #19
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On one of our larger projects this summer, I checked the prints for device heights. They were all drawn out to the center line of the box and labeled as "AFF", so that's how they were installed.
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Old 12-14-2011, 07:36 PM   #20
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I use it as the bottom.


If you read it as "receptacle @40" above finished floor", you would need to make 40" the bottom mark.

If you make it the center, 1/2 of the recep will be below 40" from the finished floor.....right?

Last edited by 220/221; 12-14-2011 at 07:40 PM.
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