ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
Dimmable LED 2x4 lay in fixtures
by Potseal. 04/23/17 07:18 PM
Old decora style outlets
by Lostazhell. 04/22/17 07:59 PM
Permit Snafus...AHJs and Contractors Jump in
by gfretwell. 04/22/17 01:11 PM
How do you find a good employee?
by HotLine1. 04/22/17 10:44 AM
Electrode boilers question
by SteveFehr. 04/21/17 08:32 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,654 Are you busy
169,347 Re: Forum
162,687 Need opinion
Who's Online Now
0 registered members (), 75 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#76221 - 01/07/01 12:09 AM Emergency Generators  
WireStu  Offline
Junior Member
Joined: Jan 2001
Posts: 4
Farmingdale, NY 11735
Our job includes installing an 2 outdoor 250 kW 3 phase 4 wire 480 Volt enclosed generators.
One site has a 600 Amp 3 phase 4 wire main breaker supplying the normal side of a 600 Amp 3 Pole Automatic Transfer. The main breaker and ATS are in the same room. The generator has a 600 Amp breaker mounted on the generator (capable of being locked open)inside the generator enclosure. The generator is about 100' from the building. The neutral in the generator is isolated from the frame. We are running 4 wires + gnd. into the building. My question is does the since I believe the NEC does not consider this a separately derived service (3 pole ATS) are the generator feeder cables considered a service entrance and thus require to have a disconnecting means where the cables enter the main building. The system neutral and the generator neutral are connected together on an isolated bus section in the ATS.

The other site is similar except the is a 4 pole transfer switch. Since this is considered a separately derived service does this installation require a disconnect switch inside the main building on the generator cables before they terminate in the ATS.

Thanks in advance for your help.


Stu


2017 / 2014 NEC & Related Books and Study Guides

#76222 - 01/07/01 05:16 PM Re: Emergency Generators  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
The generator conductors are, as you stated, feeder conductors and therefore no "service" disconnect would be required. It is, however, my opinion that Article 225 will require you to provide a disconnect for the generator conductors at the building.
Don(resqcapt19)


Don(resqcapt19)

#76223 - 01/08/01 07:46 AM Re: Emergency Generators  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,306
Do both sites have an ATS ? Do both sites have utility power?


#76224 - 01/08/01 10:28 PM Re: Emergency Generators  
WireStu  Offline
Junior Member
Joined: Jan 2001
Posts: 4
Farmingdale, NY 11735
Yes both sites do have utility power and ATS's.



Member Spotlight
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,707
Joined: October 2000
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: 0.011s Queries: 14 (0.003s) Memory: 0.7585 MB (Peak: 0.8880 MB) Zlib enabled. Server Time: 2017-04-24 21:08:54 UTC