Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
(OP)
Hey All,
Did a search and couldn't find a previous post... Does anyone know if it is acceptable to add a knock out to the side of an existing panel in which there is no more room on the top of the panel for a new conduit? Would doing this void the UL listing of the panel?
Thanks for any info you can provide.
DJR
Did a search and couldn't find a previous post... Does anyone know if it is acceptable to add a knock out to the side of an existing panel in which there is no more room on the top of the panel for a new conduit? Would doing this void the UL listing of the panel?
Thanks for any info you can provide.
DJR






RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
Punching a hole and using it to make an appropriate connection with a listed device that meets or exceeds the rating of the enclosure when properly installed, then properly installing it? Perfectly fine.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
Although I just called some other contractors I know and they said they do add knock outs all the time.
Thanks for responding jraef!
DJR
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
I meant to say the explosion resulting from the fault. I thought, that depending on the AIC rating of the panel, the panel was tested to handle that short circuit current for UL listing. I thought that to pass the test, the panel had to be able to take the listed short circuit current for a set amount of cycles without a certain amount of damage to the panel.
Jraef, ya I figured it would probably take a lot of holes to really compromise the enclosure, but you never know if you have someone foolish who does punch the enclosure to swiss cheese. I just didn't want to get caught with a technicality that made my solution incorrect and called out by an inspector.
Thanks for the input!
DJR
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
RE: Adding a Knock Out to an Existing Panel - Does it Void UL Listing?
Bill
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Jimmy Carter