100 amp subpanel ground
#1
04-22-12, 01:47 PM
100 amp subpanel ground
I have a Square D 100 amp QO box and I have the white screws on the left and then on the right side the ground screws it says to remove the bonding screw for subpanel but it looks like the white and ground is still attached to each other just wondering it that is correct thanks so much for any help on this
David Keith
David Keith
#4
04-22-12, 02:08 PM
Member
You need to remove the bond screw (if present), and buy (If you haven't) and install a ground bar.
#6
04-22-12, 03:05 PM
OK by ground bar I am assuming you mean the 6 foot metal stake
#7
04-22-12, 03:48 PM
OK I gotcha yes there is a neutral bar on the left and a ground bar on the right and it looks to me like there is a metal plate linking them together but the bonding screw is out also do I have to do anything different when attaching aluminum wires to lugs and or breakers? Or just do it like copper?
#9
04-22-12, 06:07 PM
Forum Topic Moderator
Square D uses a auxillary ground bus, purchased separately. You cannot isolate one of the busses that are factory installed to be a grounding bus.
#15
04-27-12, 04:37 PM
subpanel ground
OK so I go through all the proper steps get the sandpaper and ant-toxin paste and open up my main panel and it's 200 amp aluminum cable coming in and guess what ? no anti paste on it nor on the other 50 amp range cable I am assuming the box has been here since the house was built in 1986 and so far it's holding up good or didn't they put paste on back then and torque up the screws? Just wondering if I went through all that for nothing
#16
04-27-12, 05:56 PM
Forum Topic Moderator
The anti-oxidant is a good practice, but is not required by the Code.
The installer may have used a torque wrench but there is no real way to check. The value changes after the conductor adjusts to the clamping forces.
The installer may have used a torque wrench but there is no real way to check. The value changes after the conductor adjusts to the clamping forces.
