Acceptable Generator Wiring?


  #1  
Old 10-24-14, 02:37 PM
C
Member
Thread Starter
Join Date: Nov 2013
Posts: 213
Upvotes: 0
Received 0 Upvotes on 0 Posts
Acceptable Generator Wiring?

I hope I didn't get too creative here.

Is it acceptable to wire 2x20A outlets off a 30A inlet? Thinking being that the 30A twist lock on my generator is not protected by a 30A breaker but rather a pair of 20A breakers. The two outlets would share a neutral and use 12/3.
 

Last edited by cws05; 10-24-14 at 02:54 PM.
  #2  
Old 10-24-14, 02:54 PM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 29,711
Upvotes: 0
Received 15 Upvotes on 13 Posts
Yes, what you did is fine. You should label them as separately derived not connected to house supply and perhaps use red or blue receptacles just to indicate they are different..
 
  #3  
Old 10-24-14, 02:56 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,607
Upvotes: 0
Received 9 Upvotes on 8 Posts
As long as these circuits don't connect to the breaker panel and are stand alone, and are protected by 20 amp breakers beyond the twistlock, you will be fine. Not sure of your generator's protection devices, so a subpanel type box on the inside of the house with your 20 amp breakers would be optimal. Others will have more to say on it, so stay tuned.

Edit: Ray, I only mentioned the additional protection since I am not sure of the 30 amp twistlock protection on his generator.
 
  #4  
Old 10-24-14, 03:03 PM
C
Member
Thread Starter
Join Date: Nov 2013
Posts: 213
Upvotes: 0
Received 0 Upvotes on 0 Posts
I cant find anything in the manual that distinctly says it has 30A breakers. Its assumed the twist lock is protected by the pair of 20A. I figured I would ask here though.

I actually didn't use 12/3 but rather indivual wires in emt...the boxes of which are grounded back to the inlet box and I assume the ground on the generator (whatever that is???)
 
  #5  
Old 10-24-14, 03:09 PM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 29,711
Upvotes: 0
Received 15 Upvotes on 13 Posts
Check the voltage between the two hots. If it is ~240 volts you are fine. If it is ~120 then you can't safely do it that way. You may overload the neutral.

Ray, I only mentioned the additional protection since I am not sure of the 30 amp twistlock protection on his generator.
I'm not sure of the protection either.
 
  #6  
Old 10-24-14, 04:05 PM
C
Member
Thread Starter
Join Date: Nov 2013
Posts: 213
Upvotes: 0
Received 0 Upvotes on 0 Posts
Check the voltage between the two hots. If it is ~240 volts you are fine. If it is ~120 then you can't safely do it that way. You may overload the neutral.
The two outlets are wired off the 240/30A inlet. Of course they will measure 240.

Does anyone know if its standard for the 240/30A twist lock outlet on the generators to be protected by the pair of 120 breakers? Its a 6500 generator.
 
  #7  
Old 10-25-14, 06:32 PM
Justin Smith's Avatar
Member
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,272
Upvotes: 0
Received 1 Upvote on 1 Post
Does anyone know if its standard for the 240/30A twist lock outlet on the generators to be protected by the pair of 120 breakers? Its a 6500 generator.

6500W generators use 25A breakers...
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: