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
09/24/16 09:33 AM
breaker meltdown
by crselectric
09/24/16 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 15
sparky 9
gfretwell 8
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 270 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#210161 - 05/30/13 02:40 PM Manholes
akmaster Offline
Member

Registered: 06/11/12
Posts: 70
Loc: alaska
Is there a article in the code that requires a slope of 3% oriented to the manhole? Or does it cover that at all?

Please quote article if possible.

Thank you.

Greg
_________________________
Don't drive and TEXT! Drive now TALK LATER!

Top
2014 / 2011 NEC & Related Books and Study Guides
#210163 - 05/30/13 02:58 PM Re: Manholes [Re: akmaster]
akmaster Offline
Member

Registered: 06/11/12
Posts: 70
Loc: alaska
I believe article 310 covers manholes..
_________________________
Don't drive and TEXT! Drive now TALK LATER!

Top
#210173 - 05/31/13 05:03 PM Re: Manholes [Re: akmaster]
harold endean Offline
Member

Registered: 02/16/02
Posts: 2248
Loc: Boonton, NJ
Is the manhole owned by a utility company or privately owned? Is this a service wire, feeder wire from 1 building to another? Maybe the guys need a little more info.

Top
#210175 - 05/31/13 05:20 PM Re: Manholes [Re: akmaster]
akmaster Offline
Member

Registered: 06/11/12
Posts: 70
Loc: alaska
It is one of many manholes on an ethanol project...it will contain Medium voltage cables (4160) fiber and control and DC circuits..the are 8'x 8'x8'. They have a base and a top...
the specs call for a 0.3% slope TOWARDS the manhole..

I did not find that requirement anywhere in the code..

It seems they will need racks inside to rack the cables as well..

Thanks,
Greg
_________________________
Don't drive and TEXT! Drive now TALK LATER!

Top
#210176 - 05/31/13 06:24 PM Re: Manholes [Re: akmaster]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
Toward the manhole? Is this also the storm drain system?
_________________________
Greg Fretwell

Top
#210182 - 06/01/13 11:36 AM Re: Manholes [Re: akmaster]
harold endean Offline
Member

Registered: 02/16/02
Posts: 2248
Loc: Boonton, NJ
Greg,


Check sec. 110 V of the NEC, that talks about manholes and their construction also sec. 490 talks about voltage over 600. You also might have to refer to the National Safety Code. Most utilities follow those rules. I might have an old NESC book around, I would have to look.

Top
#210186 - 06/01/13 01:39 PM Re: Manholes [Re: akmaster]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
This may say something: From '08 Handbook:

"110.70 General.
Electrical enclosures intended for personnel entry and specifically fabricated for this purpose shall be of sufficient size to provide safe work space about electrical equipment with live parts that is likely to require examination, adjustment, servicing, or maintenance while energized. Such enclosures shall have sufficient size to permit ready installation or withdrawal of the conductors employed without damage to the conductors or to their insulation. They shall comply with the provisions of this part.
Exception: Where electrical enclosures covered by Part V of this article are part of an industrial wiring system operating under conditions of maintenance and supervision that ensure that only qualified persons monitor and supervise the system, they shall be permitted to be designed and installed in accordance with appropriate engineering practice. If required by the authority having jurisdiction, design" (documentation may be required)


Edited by HotLine1 (06/01/13 01:41 PM)
Edit Reason: added text in parenthesis
_________________________
John

Top
#210208 - 06/03/13 11:17 AM Re: Manholes [Re: akmaster]
akmaster Offline
Member

Registered: 06/11/12
Posts: 70
Loc: alaska
Thanks for the replies. @ Greg...yes towards the manhole...

@hotline...thanks I will take a look...

I can not find any requirement regarding slope of 0.3 percent towards the manhole for conduits...

does this include the whole run from man hole to man hole?

regards

Greg
_________________________
Don't drive and TEXT! Drive now TALK LATER!

Top
#210230 - 06/04/13 11:15 AM Re: Manholes [Re: akmaster]
akmaster Offline
Member

Registered: 06/11/12
Posts: 70
Loc: alaska
Another question: Is it not a requirement that manholes with high voltage are required to have the cover labeled "DANGER HIGH VOLTAGE"?

Thanks

GW


Edited by akmaster (06/04/13 11:15 AM)
_________________________
Don't drive and TEXT! Drive now TALK LATER!

Top
#210231 - 06/04/13 11:25 AM Re: Manholes [Re: akmaster]
akmaster Offline
Member

Registered: 06/11/12
Posts: 70
Loc: alaska
One more...Does the Manhole cover have to be grounded?
_________________________
Don't drive and TEXT! Drive now TALK LATER!

Top
Page 1 of 3 1 2 3 >



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