Simple Fixture Grounding Question

Reply

  #1  
Old 01-27-06, 11:46 AM
Member
Thread Starter
Join Date: Dec 2005
Posts: 257
Simple Fixture Grounding Question

I have a black, white, and ground wire coming into a ceiling box. I have a light fixture with a black, white, and ground wire. If my ceiling box is plastic, I understand that both bare ground wires get twisted together with a wire nut and tucked into the box. I know this might be dumb, but what do you do if the ceiling box is metal with a green ground screw? Do you do the same thing as with a plastic box or does that green screw need to come into play somehow?

Thanks.
 
Sponsored Links
  #2  
Old 01-27-06, 12:28 PM
bolide's Avatar
Member
Join Date: Jan 2006
Location: PA
Posts: 1,909
Originally Posted by XS6DFG0
what do you do if the ceiling box is metal with a green ground screw?
You wrap the ground wire (that comes from the switch) about 5" from the end of the wire around the green screw clockwise, tighten it, and proceed as with plastic.
 
  #3  
Old 01-27-06, 01:13 PM
Member
Thread Starter
Join Date: Dec 2005
Posts: 257
So basically I am still connecting the two ground wires with a wire nut, but I'm also looping the ground wire (that comes from the switch) around the green screw of the box.

Can you explain why this is done? What is there to gain by adding the metal box to the ground?

Thank you by the way.
 
  #4  
Old 01-27-06, 01:18 PM
Member
Join Date: Oct 2004
Location: USA
Posts: 719
You would pigtail an additional wire and screw it to the metal box.
Some city's don't allow wrapping a ground wire around a screw then continuing to more wires.
 
  #5  
Old 01-27-06, 01:23 PM
Member
Thread Starter
Join Date: Dec 2005
Posts: 257
Again, why the need to incorporate the metal box into things?

I'm just wondering why it's done?
 
  #6  
Old 01-27-06, 01:36 PM
Member
Join Date: Oct 2004
Location: USA
Posts: 719
Originally Posted by XS6DFG0

Can you explain why this is done? What is there to gain by adding the metal box to the ground?

Thank you by the way.
Grounding the box prevents it from becoming hot if a hot wire gets loose in the box.
If someone opens the box with the power on you don't want the box hot.
 
  #7  
Old 01-27-06, 01:58 PM
Member
Thread Starter
Join Date: Dec 2005
Posts: 257
I see the logic.

Thank you.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes