ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
fuse rejectors
by gfretwell. 03/23/17 01:12 PM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
TRUE POWER
by jraef. 03/21/17 09:13 PM
WEG CFW-11 Frequency Inverter
by jraef. 03/21/17 08:50 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,281 Are you busy
165,994 Re: Forum
160,502 Need opinion
Who's Online Now
0 registered members (), 54 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#128696 - 10/03/03 08:56 PM Portable generator - Seperatly derived or not  
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
I will have a portable generator that will be on occasion connected as a separately derived source and at times not a separately derived source.
When I have a tool directly plugged into the generator mounted receptacle, it will be a separately derived system. When I have the generator recept connected to house wiring through a 2 pole transfer switch (neutral not switched), it will not be a separately derived source.
250.34(C) dictates that as a separately derived source, the grounded conductor must be bonded to the generator frame. As a non-separately derived source, it would not have its grounded conductor bonded to the frame.
Remember since all loads will be connected through the generator mounted receptacles, no connection of the frame to a grounding electrode system is required 250.34(C).

OK, now the theory question. How does the functionality and safety characteristics change if the neutral to frame remains connected or unconnected (only one way or the other) when the gen is used as a non-separately derived source and a separately derived source. I cannot grasp why it is necessary to change the generator from bonded to unbonded if I plug the tool into the gen directly or into a recept in my home (which is plugged into the gen through the xfer switch).


Ron

Tools for Electricians:

#128697 - 10/08/03 08:49 AM Re: Portable generator - Seperatly derived or not  
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
To place some closure on this item, I cross posted it. The solution was right in front of my face. It is easiest to refer the post to the picture located at http://www.mikeholt.com/codeforum/ultimatebb.php?ubb=get_topic;f=7;t=000454;p=1#000002
I hope it isn't against etiquette to list another forum, sorry if it is.


Ron


Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.003s) Memory: 0.7420 MB (Peak: 0.8585 MB) Zlib enabled. Server Time: 2017-03-24 04:19:46 UTC