On Wed, 03 Jan 2007 18:55:26 -0800 Paul Hovnanian P.E. wrote: | snipped-for-privacy@ipal.net wrote: |> |> On Tue, 02 Jan 2007 22:37:36 -0800 Paul Hovnanian P.E. wrote: |> | snipped-for-privacy@ipal.net wrote: |> |>
|> |> On Tue, 02 Jan 2007 19:01:34 GMT Matthew Beasley wrote: |> |>
|> |> | |> |> | Break both the neutral and hot tabs off and run separate neutrals back to |> |> | the panel? |> |>
|> |> But how to you comply with 210.7(B) -and- 210.12(B) in the 2008 code? |> | |> | You don't power devices on one yoke from more than one branch circuit. |> |> Then what is the existance of 210.7(B) for? |> |> What are those break-off tabs for? | | For switched outlets. And for feeding each half of the duplex receptacle | from either side of a multiwire circuit, provided it is fed from a | 2-pole breaker (or other means that satisfy 210.7(B)). If the 2008 code | will require 2 pole breakers for all multiwire circuits (split | receptacles or not) and manufacturers will not provide these that also | meet the AFCI requirements, then I guess we won't be putting in any more | multiwire branch circuits.
I will suggest that AHJ not adopt NEC 2008 w/o adding some provision that provides for some way around it, or to force the manufacturers to make the required equipment.
Of course there are some options already. Cutler-Hammer does make 2-pole AFCI breakers. Also, there are such things as handle ties.
I'm also fully in favor of disqualifying Square-D and any other manufacturer that refuses to make AFCI in 2-pole.
|> | If the potential load per receptacle is so high that any additional load |> | can't be tolerated, then run a dedicated branch circuit to a single |> | receptacle. |> |> What if there is only once space, can't be expanded, and you now need |> more capacity? | | Time for a new panel or a sub-panel.
Or in my case, tell Square-D to stuff it.
|> | Kitchen circuits typically split a number of duplex receptacles between |> | two 20A branch circuits (not counting dedicated load circuits). So the |> | possibility of multiple loads per branch circuit still exists. It is |> | probably best to split a duplex receptacle as a last resort, since most |> | people will assume that duplex receptacles' loads will be applied to the |> | same branch circuit and to avoid using both halves of a duplex in the |> | event of large appliances. |> |> I've seen such splits in more places than kitchens. Like in every room |> of a house, though the same two circuits covered a lot of rooms. It was |> probably a shared neutral. But at least there was plenty of capacity at |> each place. | | Gaze fondly upon such installations, for they will become extremely rare | (if not nonexistent) after 2008. | | Those designers and electricians that can't solve capacity problems by | other means will become scarce as well.
How would you do it without enlarging the box?
At least the French did this right with a modular system that has small single outlets instead of the oversized ones we have. Then the box can be just the right size for what is needed.