ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
Recent Posts
OD of Alum and Copper
by Yoopersup. 08/22/17 12:08 PM
Grid problem??
by annemarie1. 08/21/17 01:10 PM
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,101 Are you busy
175,714 Re: Forum
167,926 Need opinion
Who's Online Now
0 registered members (), 66 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#197837 - 12/23/10 12:44 AM 11,500 foot run of 10/4 AWG wire??  
Bigplanz  Offline
Member
Joined: Mar 2009
Posts: 73
Louisville, Kentucky
I must be missing something, but I've never heard of a two mile run of 10 gauge wire. A lot went wrong with this install, but two miles of 10 gauge wire?!?!? Help me out here, am I reading this right?

The report mentions that line voltage was maintained with transformers, but what I have never heard of was that long of a run, in re: resistance.

"In order to maintain line voltage, two Acme Electrical Corporation boosting transformers were inserted in the circuit at six separate locations. Placement was determined by the drop in line voltage from 480 VAC down to 440 VAC, phase to phase."

Is this unusual in an industrial setting?

Mining accident report


Last edited by Bigplanz; 12/23/10 12:50 AM. Reason: clarify question, add info.

Arc Flash PPE Clothing, LOTO & Insulated Tools

#197844 - 12/23/10 11:20 AM Re: 11,500 foot run of 10/4 AWG wire?? [Re: Bigplanz]  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
It's not an industrial setting - it's a mining operation. Mining operates under a different set of rules. I don't know them, so I can't comment

From my 'gut feeling,' 60 amps seems a lot for #10, and I never have liked 480 or 240v "two hots" circuits.

Oddly enough, the GEMS data would have revealed this problem- at the end of the line, a direct short to the ground wire would not draw enough power to trip the breaker. I'll bet the lights weren't working that well.



Member Spotlight
lil suzi
lil suzi
Midwest
Posts: 57
Joined: August 2003
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 15 (0.003s) Memory: 0.7456 MB (Peak: 0.8640 MB) Zlib enabled. Server Time: 2017-08-22 22:19:54 UTC