Question:
: The bare copper wires are in fact grounds. They are all connected : together normally. To connect them to a grounding screw, just make : a "pigtail". : Either cut two of them shorter and twist them onto the third, which : hangs out (this is the pigtail) IF YOU HAVE ENOUGH WIRE! : Or, twist a fourth piece of bare wire about 4" long onto this set, : and connect the new one to the grounding screw. I did this with my ground wires – twist all together with one longer one going to the ground screw. In addition I added a "green" wire nut which has a hole in it for the one longer wire. The use of this type of wire nut for twisted ground wires is a requirement in my area. Mark Barrett
Response:
>: have been no problem…but I have a question about the switches. The new ones >: have a ground screw….the old ones do not. I get different answers from the >: "pros" at my home improvement stores. Here are my questions: >The "pros" are undoubtedly making some assumptions and their answers vary >based on those assumptions (or perhaps their actual competence).
Ground screws on switches are almost exclusively for the situation where the switch is installed in a plastic box. The cover screws on a switch cover are supposed to be grounded, especially if you put on a metal cover plate. US plastic boxes generally don’t have integral ground bounding to the switch-to-box nuts, hence, in order for the switch body/cover plate to be grounded, you have to install a pigtail to the switch. In metal boxes, the switch body is grounded via the mounting bolts, so this isn’t necessary. Though, who knows what local codes may add on… In Canada, plastic boxes have metal bonding straps attached to the switch mounting nuts, so, you treat them exactly the same as metal boxes. — Chris Lewis, CyberSheriff (CBC says I am, so it must be true!) For more information on spam, see http://spam.abuse.net/spam Fight spam, support Rep. Chris Smith’s TCPA extension: http://www.cauce.org
Response:
– Hide quoted text — Show quoted text ->: have been no problem…but I have a question about the switches. The new ones >: have a ground screw….the old ones do not. I get different answers from the >: "pros" at my home improvement stores. Here are my questions: >The "pros" are undoubtedly making some assumptions and their answers vary >based on those assumptions (or perhaps their actual competence). >Ground screws on switches are almost exclusively for the situation >where the switch is installed in a plastic box. The cover screws on >a switch cover are supposed to be grounded, especially if you put on >a metal cover plate. US plastic boxes generally don’t have integral >ground bounding to the switch-to-box nuts, hence, in order for the switch >body/cover plate to be grounded, you have to install a pigtail to the >switch. >In metal boxes, the switch body is grounded via the mounting bolts, so >this isn’t necessary.
As a former construction inspector, I would never accept grounding via mounting bolts For one thing, these are not necessarily tightened completely, but are left somewhat loose to allow the switch to project the proper amount through the cover plate. Some jurisdictions must accept this, since one can buy switches without a grounding screw, but you won’t see any in my house. Rick Marinelli
Response:
- Hide quoted text — Show quoted text – > As part of a kitchen spruce-up, I am replacing the old beige outlets with >white ones and replacing old toggle switches with rocker type. The outlets >have been no problem…but I have a question about the switches. The new ones >have a ground screw….the old ones do not. I get different answers from the >"pros" at my home improvement stores. Here are my questions: >1) In examining the wiring configuration in one switch junction box (it is a >double switch…both single pole) I see three bare copper wires twisted >together. Are all of them ground wires? And if so, how do I attach the three >wires to TWO grounding screws?? >2) What are the dangers of leaving the bare wires as is, without connecting >any to the grounding screws? > I’m fairly handy, but not a pro when it comes to electrical work. I want to >make sure I’m not doing something risky, as this is something I’d like to do >in other rooms in my house, and can’t afford to hire a pro to do it. Thanks >in advance for your help.
The bare copper wires are in fact grounds. They are all connected together normally. To connect them to a grounding screw, just make a "pigtail". Either cut two of them shorter and twist them onto the third, which hangs out (this is the pigtail) IF YOU HAVE ENOUGH WIRE! Or, twist a fourth piece of bare wire about 4" long onto this set, and connect the new one to the grounding screw. — Compaq Computer Corporation (603)-884-1294 110 Spit Brook Road M/S ZKO3-3/U14 Nashua, NH 03062-2698 Only my cat shares my opinions, and she can’t reach the light switches.
Response:
As part of a kitchen spruce-up, I am replacing the old beige outlets with white ones and replacing old toggle switches with rocker type. The outlets have been no problem…but I have a question about the switches. The new ones have a ground screw….the old ones do not. I get different answers from the "pros" at my home improvement stores. Here are my questions: 1) In examining the wiring configuration in one switch junction box (it is a double switch…both single pole) I see three bare copper wires twisted together. Are all of them ground wires? And if so, how do I attach the three wires to TWO grounding screws?? 2) What are the dangers of leaving the bare wires as is, without connecting any to the grounding screws? I’m fairly handy, but not a pro when it comes to electrical work. I want to make sure I’m not doing something risky, as this is something I’d like to do in other rooms in my house, and can’t afford to hire a pro to do it. Thanks in advance for your help. Deb
Response:
> As part of a kitchen spruce-up, I am replacing the old beige outlets with > white ones and replacing old toggle switches with rocker type. The outlets > have been no problem…but I have a question about the switches. The new ones > have a ground screw….the old ones do not.
That is correct. Old switches were rarely grounded. Decora’s seem to always be. Mostly this is done because of the prevelence of using plastic boxes these days. You can’t rely on the metal parts of the switch to be grounded just because they are screwed to the box. > 1) In examining the wiring configuration in one switch junction box (it is a > double switch…both single pole) I see three bare copper wires twisted > together. Are all of them ground wires? And if so, how do I attach the three > wires to TWO grounding screws??
All bare wires are grounds. Twist some more short bare wires into the bundle (this may or may not also need some sort of fastening device, seems to vary via municpality). > 2) What are the dangers of leaving the bare wires as is, without connecting > any to the grounding screws?
The metal parts of the switch aren’t grounded. Since the ones in the box weren’t before, you probably are no worse off than you were before. But since you have the grounds, you might as well add them.
Response:
: have been no problem…but I have a question about the switches. The new ones : have a ground screw….the old ones do not. I get different answers from the : "pros" at my home improvement stores. Here are my questions: The "pros" are undoubtedly making some assumptions and their answers vary based on those assumptions (or perhaps their actual competence). : 1) In examining the wiring configuration in one switch junction box (it is a : double switch…both single pole) I see three bare copper wires twisted : together. Are all of them ground wires? And if so, how do I attach the three : wires to TWO grounding screws?? Yes, technically the bare wires are "safety ground." Without seeing the wires it is hard to guess why there are 3 instead of 4 that I would expect, so I’ll suggest a method that should work correctly whatever the reason. Simply attach 2 bare pigtails to the 3 existing bare wires. Use a wire nut to do this. Attach one of the pigtails to each switch at the appropriate ground screw. : 2) What are the dangers of leaving the bare wires as is, without connecting : any to the grounding screws? Likely there is very little danger, but adding a couple pigtails and hooking them up is trivial and I highly recommend it. You could call and ask your town or county electrical inspector. If you are just replacing a switch it’s probably not an inspection issue, but he or she will tell you what would be acceptable by the local code. Some local codes don’t like pigtail connections, while others require them. Most inspectors I’ve talked to have been reasonable and friendly if you ask questions like this. — * Virginia Polytechnic Institute & State University, Computing Center *
Response:
|> As part of a kitchen spruce-up, I am replacing the old beige outlets with |> white ones and replacing old toggle switches with rocker type. The outlets |> have been no problem…but I have a question about the switches. The new ones |> have a ground screw….the old ones do not. I get different answers from the |> "pros" at my home improvement stores. Here are my questions: |> |> 1) In examining the wiring configuration in one switch junction box (it is a |> double switch…both single pole) I see three bare copper wires twisted |> together. Are all of them ground wires? Yes; at least that would be the usual practice. |> And if so, how do I attach the three |> wires to TWO grounding screws?? With pigtails. Run a ground wire from each switch to the bundle of ground wires–you should end up with five wires twisted together (you may have to use a larger wire nut). |> 2) What are the dangers of leaving the bare wires as is, without connecting |> any to the grounding screws? The danger is that a hot wire could come loose and electrify part of the switch. Most switches have few, if any, exposed metal parts; but if you have a ground wire in the box it’s trivial to ground the switch. Hope this helps, — "PHENOMENAL COSMIC POWER; itty-bitty living space." –Robin Williams in _Aladdin_, on the pros and cons of being a Genie.
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