ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
480 Delta
by ghost307. 05/21/18 10:38 AM
turning down possible problem customer
by HotLine1. 05/21/18 07:53 AM
Furnace igniter leaking noise to stereo
by sparkyinak. 05/20/18 07:20 PM
electircal ageing test on IPC
by HotLine1. 05/14/18 09:42 AM
What estimating software do you recommend?
by wattsittoyou. 05/14/18 06:28 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
1 registered members (Tjia1981), 43 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Disconnect at secondary of transformer #184631
02/15/09 12:25 AM
02/15/09 12:25 AM
R
Rhiney  Offline OP
New Member
Joined: Feb 2009
Posts: 3
California
Hello there!
I've got a situation here where we are setting a 112.5kva480x 120/208 transformer on the roof of a building.
It will supply power to a 400Amp MCB-type panelboard below roughly 40'of conduit and wire away.
Are we required to have a fused disconnect near the transformer (word has it wthin 25')? Where in the code is this requirement if it exists?
Primary overcurrent protection is a 175amp circuit breaker.
Thanks much for any help

2017 / 2014 NEC & Related Books and Study Guides
Re: Disconnect at secondary of transformer [Re: Rhiney] #184632
02/15/09 12:41 AM
02/15/09 12:41 AM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 840
Michigan
240.21
Read which one applys in this section for you.
Also read Table 450.3(B).

Last edited by Yoopersup; 02/15/09 12:44 AM.
Re: Disconnect at secondary of transformer [Re: Yoopersup] #184633
02/15/09 01:41 AM
02/15/09 01:41 AM
R
Rhiney  Offline OP
New Member
Joined: Feb 2009
Posts: 3
California
Thanks much Yoopersup.
That cleared it right up for me . A fused disconnect within 25ft it is .


Featured:

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

 

Member Spotlight
BEAMEUP
BEAMEUP
WA
Posts: 27
Joined: December 2004
Show All Member Profiles 
Top Posters(30 Days)
twh 12
Popular Topics(Views)
246,853 Are you busy
184,207 Re: Forum
173,448 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.020s Queries: 15 (0.004s) Memory: 0.9505 MB (Peak: 1.0773 MB) Zlib enabled. Server Time: 2018-05-21 16:39:59 UTC