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 HotLine1. 03/24/17 07:53 AM
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)
231,308 Are you busy
166,041 Re: Forum
160,519 Need opinion
Who's Online Now
1 registered members (HotLine1), 52 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#79577 - 01/06/02 11:49 AM Service and ATS  
tmon  Offline
Member
Joined: Jul 2001
Posts: 29
Is it legal to run a service from the utility transformer to an automatic transfer switch prior to the overcurrent device (service disconnect means)? The load is an MCC protected with a built-in main circuit breaker for a sewer lift station. The ATS is 2 1/2 feet from the MCC. Thanks


2017 / 2014 NEC & Related Books and Study Guides

#79578 - 01/06/02 12:25 PM Re: Service and ATS  
Elzappr  Offline
Member
Joined: Dec 2001
Posts: 270
Oregon
What we did on a similar job (for a situation where it wasn't feasible to re-route, or tap on to, the service entrance conductors) was to add a "top hat" to the service equipment, and route the load side of the main disconnect section up and over to the transfer switch/ground fault sensor, and then back to the rest of the load. This required buying custom made bus bars from the switchgear manufacturer in order to feed the transfer switch and the load side of the gear. Make sure that bracing for the bus bar modification is designed ahead of time, you don't want those new bus bar extensions pointing up to the top hat to be flappin' in the breeze!

[This message has been edited by Elzappr (edited 01-06-2002).]

[This message has been edited by Elzappr (edited 01-06-2002).]


#79579 - 01/06/02 02:38 PM Re: Service and ATS  
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
As I learned in another thread, on another forum, when installing a transfer switch ahead of the service disconnect the TS becomes the service disconnect. It must be listed and marked as suitable for use as service Equipment. Transfer switches marked this way are required, in their listing, to have accessible means to disconnect both sources of supply. Over current protection is allowed to be adjacent to the service disconnecting means. 230-91.
Thanks Don [Linked Image]



Member Spotlight
electure
electure
Fullerton, CA USA
Posts: 4,259
Joined: December 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: 0.015s Queries: 14 (0.003s) Memory: 0.7502 MB (Peak: 0.8728 MB) Zlib enabled. Server Time: 2017-03-24 12:08:35 UTC