Gutter to Panelboard

Status
Not open for further replies.
C

chipster

Member
Location
California
Situation: Have a typical 42 circuit panelboard (208/120) newly installed. Leaving the panelboard is an 8x8" gutter wireway with all circuits (20A) #12 AWG plus EGC running through it. Circuits are for hepa filter fans. Legal or not legal, please cite code section for concurrance.
 
It might be or it could be a violation.

It would depend on the number of current carrying conductors and the size of the conductors.
 
Gutter to Panelboard

No! I am saying that the gutter ties to the top of the panelboard, then runs straight vertical for 7' then nipples (less than 24") 90 degrees to a large can.
 
chipster said:
Situation: Have a typical 42 circuit panelboard (208/120) newly installed. Leaving the panelboard is an 8x8" gutter wireway with all circuits (20A) #12 AWG plus EGC running through it. Circuits are for hepa filter fans. Legal or not legal, please cite code section for concurrance.
Click to expand...

Are you saying you have 84 current carrying conductors in an 8X8 raceway? And did not derate them?

I am not sure the use you described is actually a gutter. I think it is just a raceway. See article 366.

The wires should all be #6. Of course, that probably would violate the fill value allowed for an 8X8 raceway.
 
Last edited:
image003.jpg


...........
 
Gutter to Panelboard

The wire-count for current carrying conductors is in fact 84. The wireway is a listed and approved gutter. Applying table B310.11, the max current that I could have on any one circuit is 15A. Am I in error here?
 
chipster said:
The wire-count for current carrying conductors is in fact 84. The wireway is a listed and approved gutter. Applying table B310.11, the max current that I could have on any one circuit is 15A. Am I in error here?
Click to expand...

Lets see. #12 thwn is 30 amps, derate is 35%.Conductor amp is 10.5amps. Providing you do not have any circuits over 10.5 amps or feeding multi outlet branch circuits, you can use the next higher standard breaker. (15a).
Rick
 
chipster said:
The wire-count for current carrying conductors is in fact 84. The wireway is a listed and approved gutter. Applying table B310.11, the max current that I could have on any one circuit is 15A. Am I in error here?
Click to expand...

I don't think listing or approval matters.

Even if you get around the issue of whether it is really a gutter or not, you have more than 30 CCC. So you have to apply the derating factors in the table. In this case 35%.
 
Gutter to Panelboard

Thanks Bob and all, this is a mute issue now anyway. The contractor is removing the gutter and installing individual or grouped area runs of conduit. This will allow them to keep the panelboard OCPD's at 20A.
 
Gutter to Panelboard

Thanks for the help Bob and all. The contractor is removing the gutter and installing individual and grouped conduit runs to the loads, making it possible to use the OCPD's (20A) that were purchased for the project.
 
Status
Not open for further replies.
Top