MC cable "stacked"

[sandsnow]

What do you think this means in 310-15 (B)(2)(a)?

If they are stacked one on top on another, do you see an issue with derating? I don't. Even if it was, once the cable leaves the stacker, it seperates to provide spacing.

If they were stacked on top of another and next to another in a cable tray then yes.

A cable stacker introduced similar to a Caddy model; stacks the cable vertically one on top of another.

A fellow inspector pointed this out (whose opinion I respect) and I wondered how others view it or others enforce it.

Thanks

 

[benaround]

Re: MC cable "stacked"

Larry,

Does the stacker leave a space inbetween the cables,a space the same as the space of the cable? If so then I say it's good. If stacked one on top of another then IMO derating is required.

 

[pierre]

Re: MC cable "stacked"

"without maintaining spacing..."

The size of the spacing is not specified, but I would accept the spacing provided by using the stackers.

 

[infinity]

Re: MC cable "stacked"

I would keep in mind that there is an exception to 310(B)(2)(a) which is Exception No. 5. This allows for type MC and AC cables to be stacked without derating if they:

1-Have not more than 3 current carrying conductors in each cable

2-Are #12 AWG cu

3-Not more than 20 current carrying conductors are bundled, stacked or supported on "bridle rings".