ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Extension cords
by annemarie1. 09/20/18 08:54 AM
Inspection camera help
by Bill Addiss. 09/19/18 10:50 PM
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 9 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Service and ATS #79577
01/06/02 11:49 AM
01/06/02 11:49 AM
T
tmon  Offline OP
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
Re: Service and ATS #79578
01/06/02 12:25 PM
01/06/02 12:25 PM
E
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).]

Re: Service and ATS #79579
01/06/02 02:38 PM
01/06/02 02:38 PM
N
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]


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Posts: 165
Joined: March 2007
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
Popular Topics(Views)
249,371 Are you busy
187,300 Re: Forum
176,645 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.026s Queries: 14 (0.015s) Memory: 0.9510 MB (Peak: 1.0746 MB) Zlib enabled. Server Time: 2018-09-22 09:54:05 UTC