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
Why cables look like they do
by Texas_Ranger
38 minutes 9 seconds ago
Forum Software Upgrade coming soon...
by HotLine1
42 minutes 36 seconds ago
Re: Fabricating Guards out of Lexan?
by ghost307
Today at 11:21 AM
Would ELV branch circuits be a good idea?
by ghost307
Today at 11:18 AM
100% breakers?
by Texas_Ranger
Yesterday at 06:13 AM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
HotLine1 19
Webmaster 14
Trumpy 12
ghost307 12
frank 9
Who's Online
2 registered (gfretwell, ghost307), 0 Guests and 80 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#79752 - 01/17/02 08:39 AM Coal Mine/ MSHA
frodo Offline
Member

Registered: 05/16/01
Posts: 129
Loc: louisville, ky usa
hi,
i am looking at doing three buildings at three different coal mines. the building will b some kingd of lab. just lights and recepts.

i am trying to decide whether to use EMT, ENT, BX, or MC for these buildings..

the area is not classified.

anything else i should consider?

-regards

frodo

Top
2017 / 2014 NEC & Related Books and Study Guides
#79753 - 01/17/02 02:06 PM Re: Coal Mine/ MSHA
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
You can forget the BX unless you get the kind with an equipment grounding conductor in it, the Fed's will require this.

I usually use MC for concealed work & EMT (with an equipment ground pulled in) for exposed work.

I'd say forget the ENT, knowing how mine inspectors think, they probably wouldn't care to see it.

For circuits up to #6 AWG, your equipment ground must be sized 100% of the hot conductor, #4 & up it must be at least 50% of the hot conductor. This could be a problem if you tried to run any cable larger than #10, since the equipment ground will be too small.

What state will this be in?

Tom
_________________________
Few things are harder to put up with than the annoyance of a good example.

Top
#79754 - 01/17/02 06:19 PM Re: Coal Mine/ MSHA
frodo Offline
Member

Registered: 05/16/01
Posts: 129
Loc: louisville, ky usa
hi,
thanks for the reply. two of the labs is in southern indiana and the other is in kentucky.

in a drop in cieling then just using flex would be adequate for the light fixtures, and run emt everywhere else?

ent would probably scare even those mine guys!

-regards

frodo

Top
#79755 - 01/18/02 05:52 PM Re: Coal Mine/ MSHA
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
Yeah, they understand flex. The biggest thing, as I pointed out, is to have an equipment ground in every raceway.

I'll be doing a Bath House & motor Barn in Mossy, WV, probably next month. The Bath House is portable, being built about 6 miles from where I live & we'll ship it on flatbeds. The motor barn will be built on site.

I've been to Inez, Kentucky a few times, thats about as far from Indianna as you can get & still be in Kentucky.

Toim

[This message has been edited by Tom (edited 01-18-2002).]
_________________________
Few things are harder to put up with than the annoyance of a good example.

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