The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
230 or 345 kV transmission lines?
by Vlado
Yesterday at 09:33 AM
breaker meltdown
by crselectric
Yesterday at 12:42 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 17
gfretwell 9
sparky 9
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 284 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#184631 - 02/14/09 08:25 PM Disconnect at secondary of transformer
Rhiney Offline
New Member

Registered: 02/12/09
Posts: 3
Loc: 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

Top
2014 / 2011 NEC & Related Books and Study Guides
#184632 - 02/14/09 08:41 PM Re: Disconnect at secondary of transformer [Re: Rhiney]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
240.21
Read which one applys in this section for you.
Also read Table 450.3(B).


Edited by Yoopersup (02/14/09 08:44 PM)

Top
#184633 - 02/14/09 09:41 PM Re: Disconnect at secondary of transformer [Re: Yoopersup]
Rhiney Offline
New Member

Registered: 02/12/09
Posts: 3
Loc: California
Thanks much Yoopersup.
That cleared it right up for me . A fused disconnect within 25ft it is .

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals