Self grounding/bonding switches
#1
12-10-15, 10:13 AM
Self grounding/bonding switches
I have some busy 2gang metal boxes. If I can save grounding the Legrand CSB20ac switches it would be nice. When I ground the box, and if I remove the paper washer from the yolk do I need to have a grounding pigtail from these switches?
#2
12-10-15, 10:40 AM
if I remove the paper washer from the yolk do I need to have a grounding pigtai
#3
12-10-15, 10:44 AM
I will have a metal cover plate. But doesn't the metal to metal contact of the box, switch and cover plate suffice? It means 5 instead of 7 ground wires in the box.
#5
12-10-15, 10:53 AM
Can't go with deeper boxes, it is on an ICF concrete wall.
But doesn't the metal to metal contact of the box, switch and cover plate suffice? It means 5 instead of 7 ground wires in the box.
But doesn't the metal to metal contact of the box, switch and cover plate suffice? It means 5 instead of 7 ground wires in the box.
#6
12-10-15, 10:54 AM
I'm surprised the Legrand heavy duty switches aren't self-grounding, but I don't see any mention of it on the spec sheet. A self-grounding switch will either have a small copper plate or a pair of steel wires pinching the mounting screw to the device yoke. You can still save a lot of space by cutting one long ground wire and looping from switch to switch, then terminate it at a ground screw in the back of the box.
Or change to Leviton TradeMaster switches which are spec'd as self-grounding.
All grounds combined count toward one box fill unit, doesn't matter how many devices they touch. Pigtails inside the box don't count toward box fill.
Or change to Leviton TradeMaster switches which are spec'd as self-grounding.
All grounds combined count toward one box fill unit, doesn't matter how many devices they touch. Pigtails inside the box don't count toward box fill.
#8
12-10-15, 03:36 PM
#9
12-10-15, 03:59 PM
Member
That box is a 2-gang handy box and the wrong box to use in my opinion. You didn't say, but assuming it's surface mounted, what you should have used is a 1900 box (4" square) with a raised cover. The devices actually have a bolted connection to the raised cover and as long as the box is properly grounded, it isn't necessary to connect a ground pigtail to the devices because the raised cover screws tightly to the box. 2-gang handy boxes are something I have never seen at a supply house. The first one I ever saw was just a couple years ago at a box store.
https://www.google.com/search?q=1900...HdNqAZkQsAQIOg
https://www.google.com/search?q=1900...HUxnCIkQsAQIIw
https://www.google.com/search?q=1900...HdNqAZkQsAQIOg
https://www.google.com/search?q=1900...HUxnCIkQsAQIIw
#10
12-10-15, 04:11 PM
With the mud ring, raised cover the 1900 is too deep. I am using EIFS only about 1/8" thick. I used the handy boxes recessed in the EPS of the ICF that is 2.5" thick.
#11
12-10-15, 04:23 PM
Member
I am using EIFS only about 1/8" thick. I used the handy boxes recessed in the EPS of the ICF that is 2.5" thick.
Not sure what all that stuff is, but if you had used a 1 1/2" deep 1900 box the raised cover wouldn't have made the entire installation over 2". If it's all surface mounted I don't see an issue with the depth anyway. You don't use a mud ring when using a raised cover.
#12
12-10-15, 05:14 PM
The boxes are flush mounted in the 2.5" of expanded poly styrene of the Insulated Concrete Form.
I don't see the point in using a two piece 4" 1900 box. When the handy box can do it in one piece. Also with a raised cover you can't use a regular plate, that would extend beyond the edge of the box for a cleaner looking install.
I don't see the point in using a two piece 4" 1900 box. When the handy box can do it in one piece. Also with a raised cover you can't use a regular plate, that would extend beyond the edge of the box for a cleaner looking install.
#13
12-11-15, 09:03 AM
Member
The boxes are flush mounted in the 2.5" of expanded poly styrene of the Insulated Concrete Form.
Go ahead and do it your way then.
I don't see the point in using a two piece 4" 1900 box. When the handy box can do it in one piece. Also with a raised cover you can't use a regular plate,
#14
12-11-15, 12:31 PM
I did say, twice, that the boxes were recessed into 2.5" of eps. Nor did I ever want to use a raised cover or mud ring, or a different box. My question was about self grounding switches, not boxes. http://images.ibsrv.net/ibsrv/res/sr...ilies/wall.gif (red-faced head hitting brick wall)
I bought those switches a few months ago, and the new version have a little metal tab clinging to one of the screws. FYI I installed the switches I had, no ground wire. I am confident they will ground through the metal box.
I bought those switches a few months ago, and the new version have a little metal tab clinging to one of the screws. FYI I installed the switches I had, no ground wire. I am confident they will ground through the metal box.
#15
12-11-15, 03:32 PM
Group Moderator
A switch that is attached to a grounded metal box, with metal screws, is considered grounded. 404.9(B) (2011)
Just recently I have started to see switches with a self grounding clip installed similar to the ones on self grounding receptacles. I do not know if this is a future code requirement (2017) or a requirement of UL.
Just recently I have started to see switches with a self grounding clip installed similar to the ones on self grounding receptacles. I do not know if this is a future code requirement (2017) or a requirement of UL.
Last edited by Tolyn Ironhand; 12-11-15 at 03:51 PM.
