Feed Through Panel Separation Distance

[graham85]

My company is currently working on a power and lighting design for an industrial building. We have used a feed through lug panel for the 2nd floor lighting from a panel in the mechanical room. The distance between them is over 10'.

1. Are we required to install a disconnect betwwen the two panels because the distance is greater than 10'? I have not been able to find the code section refering to this rule.

2. If we were to change our design so that the second floor panel was a MCB panel would this be an alternative to installing a disconnect?

Thanks in advance for everyones assistance.

Keith

 

[graham85]

Re: Feed Through Panel Separation Distance

I think I have found the code section I was looking for:

240.21(B)(1)

Am I on the right path?

 

[iwire]

Re: Feed Through Panel Separation Distance

Keith in a typical feed through panel arrangement both panels are rated for the feeders over current protection.

If this is your situation there is no need for more protection or disconnects.

A single over current device at the start of the feeder is all that is needed, that could feed the any number of main lug only panels.

 

[a.wayne3@verizon.net]

Re: Feed Through Panel Separation Distance

Bob as long as they MLO panels are rated at the amperage right ......

 

[a.wayne3@verizon.net]

Re: Feed Through Panel Separation Distance

same or above amperage I meant to say

 

[roger]

Re: Feed Through Panel Separation Distance

Allen you are right, if the busses for both (or more) panels are rated for the amperage.

Keith, think of this a feeder supplying multiple units, this is not a tap.


Roger

 

[jim sutton]

Re: Feed Through Panel Separation Distance

no more OC protection is needed, regardless of distance apart, as long as the feeder size is the same throughout and both panels are rated the same. The original OC protection is all you need. This is not a tap.

The thing to remember though is not to overload the feeder.