How many 14/2 wire through a single 4-gang knockout/clamp?
#1
10-11-15, 04:44 PM
How many 14/2 wire through a single 4-gang knockout/clamp?
I was going to do some work in a 4-gang box. Pulled the decorator plate off, it is an old style bakelite box that was cracked badly. I decided to replace the box. Went to the local hardware store, bought an old-work 4-gang plastic box (CARLON 68-cu in 4-Gang Plastic Old Work Wall Electrical Box).
There are 4 x 14/2 wires that need to enter the box from the top. If I stretch them out across all four openings, then one of them will come up short. My question is, can I put two wires through one of the knockout/clamps?
If not, I will just return the box to the hardware store and get the "new work" box since this has more knockouts closer together (CARLON 55-cu in 4-Gang Plastic New Work Wall Electrical Box). I'd wanted to avoid this because this means knocking out drywall.
Thank you,
Andrew
There are 4 x 14/2 wires that need to enter the box from the top. If I stretch them out across all four openings, then one of them will come up short. My question is, can I put two wires through one of the knockout/clamps?
If not, I will just return the box to the hardware store and get the "new work" box since this has more knockouts closer together (CARLON 55-cu in 4-Gang Plastic New Work Wall Electrical Box). I'd wanted to avoid this because this means knocking out drywall.
Thank you,
Andrew
#2
10-11-15, 06:55 PM
Group Moderator
Unfortunately two, three and four gang boxes come with flapper type cable clamps and only one cable can be in one clamp.
A single gang box uses knockouts and you can run two cables in a knockout.
A single gang box uses knockouts and you can run two cables in a knockout.
#3
10-11-15, 07:33 PM
Thank you PJmax.
I just came across a PDF from Carlon that states the exact same thing. Regarding how many cables can go through a single clamp:
"One. The National Electrical Code section 314.17(c) Exception allows you to put multiple cables through a knockout, but only one is allowed through each clamp."
I found another brand that should work without knocking out drywall (Allied Moulded 9314). It'll just cost about 3x the price.
I just came across a PDF from Carlon that states the exact same thing. Regarding how many cables can go through a single clamp:
"One. The National Electrical Code section 314.17(c) Exception allows you to put multiple cables through a knockout, but only one is allowed through each clamp."
I found another brand that should work without knocking out drywall (Allied Moulded 9314). It'll just cost about 3x the price.
#4
10-11-15, 07:36 PM
Group Moderator
