junction box grounding

george111May 1, 2012

I have a 14x14x6 J-Box with 14 #12 romex entering and 14 #12 romex leaving box. Can I install a ground bar in box to properly ground?

Thank you for reporting this comment. Undo
brickeyee

You do not need a ground bar, but just a single correct machine screw in a threaded hole to ground the box.

A bar could be used as a convenient (if somewhat expensive) way to bond all the grounds together, but a separate wire from the bar to a machine screw to bond the box is still required.

    Bookmark   May 1, 2012 at 8:52AM
Thank you for reporting this comment. Undo
george111

Thanks brickeye, I thought all grounds in the cables had to be bonded to the box

    Bookmark   May 1, 2012 at 5:26PM
Thank you for reporting this comment. Undo
brickeyee

"all grounds in the cables had to be bonded to the box"

You can join all the cables and then use a pigtail from the junction to ground the box.

The pigtail must be the size of the largest ground in the cables, but they are not required to each bond separately to the box.

If you leave the largest ground entering the box longer you can then cut of the excess length and use it as the bonding pigtail for the box.

    Bookmark   May 2, 2012 at 11:14AM
Sign Up to comment
More Discussions
Reuse electrical panel
I replaced a 24 circuit Square D panel with a new 40...
zver11
Help with 240V 50A location
I'm trying to do a challenging kitchen layout. I will...
12crumbles
Spa Capacitor question
My spa is wired for 220v. The pump motor is rated for...
pugmark
Ceiling fan wiring
I have a new ceiling fan with a light. The fan has...
jjp2121
ARGH! no boxes
Went over to my daughter's house to help them change...
Ron Natalie
© 2015 Houzz Inc. Houzz® The new way to design your home™