ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 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 (), 64 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#203201 09/14/11 11:58 AM
Joined: Jan 2005
Posts: 91
H
Member
Need some help. I have a portable 7.5 KW generator on a trailer. It's used to supply power to a portable job trailer in strip mining operations. The on board panel is a replacement that consists of a 40 amp back fed main and some single pole 20s. It's been hacked up pretty good and I want to replace it.
I'm thinking of using a Midwest panel with a 30 amp back fed main. Branch breakers would be (1) 30 amp, 2 pole GFI (for job trailer)and (1) 20 amp, 1 pole GFI (for genset mounted receptacle).
This is a new one for me so any comments or suggestions would be welcome.

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: Apr 2002
Posts: 7,333
Likes: 7
Member
Sounds like a plan IMHO, but I'm not 'up' on mining rules & regs.



John
Joined: Jul 2004
Posts: 787
L
Member
I would think that a 40 A main with a two pole 30 A GFCI and two or four single pole 20 A GFCI would be a better choice.

With a 30 A main and a 30 A GFCI, when fully loading the GFCI, you are in a race between both of the 30 A breakers.

Having two or four single pole breakers allows you to use mutiple small loads without one breaker trip making everything stop.

How do you deal with grounds and neutrals? Is the centertap of the generator windings tied to the generator frame? Is the generator frame bonded to the trailer frame? Do you drive ground rods or drag chains?

What does MSA state about temporary portable power for strip mines?


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
Trumpy
Trumpy
SI,New Zealand
Posts: 8,432
Joined: July 2002
Top Posters(30 Days)
BigB 9
triple 3
Popular Topics(Views)
302,486 Are you busy
231,876 Re: Forum
216,500 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5