ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Swimming pool pump
by gfretwell - 03/29/23 01:01 PM
Using THWN on automotive circuits
by BigB - 03/23/23 11:19 AM
Continuous load
by HotLine1 - 03/08/23 02:11 PM
How's all our Non-US folks doing?
by dsk - 03/08/23 11:56 AM
Old Computers?
by Bill Addiss - 03/04/23 05:06 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 37 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Mar 2003
Posts: 849
Y
Member
Fire pump 20hp & booster pump 3/4 hp.460volt3phase

20hp=27amps LRC=145 amps
3/4 hp=1.6 amps LRC 12.5 amps
Disconnect Size 145 +12.5=157.5
240.6 next size up 175amps
175amp disconnect switch
The way I read it from the fire pump locked rotor sized disconnect switch to fire pump controller wire sized at 125 %
27plus 1.6=28.6x125%=28.6
according to the code 175 amp disconnect switch with 30 amp wire from switch to fire pump controller then to the mtr. code handbook 2002 pages 975-976.
Please comment . Thank u

Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

Joined: Jan 2004
Posts: 1,507
G
Member
Yooper- I see you got it right. You must have had a good teacher [Linked Image]


George Little

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Top Posters(30 Days)
BigB 3
jt7 2
Popular Topics(Views)
305,202 Are you busy
233,571 Re: Forum
218,241 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5