ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Inspection camera help
by Bill Addiss. 09/15/18 11:32 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
Lighting Load questions
by HotLine1. 09/14/18 07:04 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 32 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
HV service laterals under a building #212599
01/26/14 01:40 PM
01/26/14 01:40 PM
SafetyWired  Offline OP
Member
Joined: Jul 2013
Posts: 44
Pa, USA
Customer has Primary power run from utility pole, under street (where it becomes customer responsibility) around side of building (aprox 700') where it enters outside switch. Cabling us direct burial CN wire. We need to replace said cabling. Thing is years ago owner added on to the building (25'x25') over top of the laterals. We cannot go around building with new cabling because of property boundary issues. Proposing to go under building with new laterals. I cannot find where NEC mentions any restrictions of this. Thought I would check here.

2017 / 2014 NEC & Related Books and Study Guides
Re: HV service laterals under a building [Re: SafetyWired] #212601
01/26/14 02:47 PM
01/26/14 02:47 PM
HotLine1  Online Content

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
"Under Building" as in underneath a slab (concrete) is considered to be outside the structure in Article 230, and is allowed.

Suggest to run this by your local AHJ first.


John
Re: HV service laterals under a building [Re: HotLine1] #212602
01/26/14 02:51 PM
01/26/14 02:51 PM
SafetyWired  Offline OP
Member
Joined: Jul 2013
Posts: 44
Pa, USA
Originally Posted by HotLine1
"Under Building" as in underneath a slab (concrete) is considered to be outside the structure in Article 230, and is allowed.


What I suspected...thank you

Originally Posted by HotLine1
Suggest to run this by your local AHJ first.


Always! smile

Re: HV service laterals under a building [Re: SafetyWired] #212631
01/27/14 10:10 PM
01/27/14 10:10 PM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 849
Michigan
Voltage???
Locations??
Where Metered???
Transformer???
Service Disconnect???

Re: HV service laterals under a building [Re: SafetyWired] #212636
01/28/14 09:58 AM
01/28/14 09:58 AM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
I foresee horizontal boring in your future.

Plenty of it. ( Street and structure, perhaps much, much, more. )

I also expect that this run will entail an EE.

I've only ever had to run HV conduit in 'greenfield' conditions. So, I'm not too much help.

I do know that you don't want any collateral damage. That's always a bug bear for seasoned ground.

Back in the day, HV cables were rolled down quick and sloppy: no warning tapes, no warning strata. (sand as backfill, etc.)

You might be forced to pot-hole down with hydro-jets -- to sample worrysome ground.

When things get 'busy' you'll need to probe like crazy.

Documentation for old (buried) work is often pitiful.

You might take out a special insurance policy for this job.



Tesla
Re: HV service laterals under a building [Re: Yoopersup] #212664
01/31/14 12:06 AM
01/31/14 12:06 AM
SafetyWired  Offline OP
Member
Joined: Jul 2013
Posts: 44
Pa, USA
Originally Posted by Yoopersup
Voltage???
Locations??
Where Metered???
Transformer???
Service Disconnect???
voltage-13.2kv
metering is PT>CT's in switch cab
Dry outdoor>480/277v
Air switch



Re: HV service laterals under a building [Re: SafetyWired] #212665
01/31/14 12:14 AM
01/31/14 12:14 AM
SafetyWired  Offline OP
Member
Joined: Jul 2013
Posts: 44
Pa, USA
Have trench run from street (customer side) to where we need to go under building. Lined up directional drill co to go under building.
Dug down today to locate footer. Footer down 48" from 8" concrete floor. Dug three ft below top of footer and still did not find bottom. Other side of building to HV switch is only 30 ft. Directional drill starts at 20 deg angle than levels off at desired depth. Coming out other side of building at 7' or more does not give us the distance directional drill needs to get back up to switch. Also any trench below 4' needs to be shored to prevent cave in.
We went to plan B and will be trenching across floor of building inside than coring holes at either end for 4" sch 40. Conductors are JCN Jacketed Concentric Neutral) #2.

Re: HV service laterals under a building [Re: SafetyWired] #212678
02/02/14 12:08 PM
02/02/14 12:08 PM
SafetyWired  Offline OP
Member
Joined: Jul 2013
Posts: 44
Pa, USA
All conduit run and wire pulled. Terminate Monday morning.

Have tons of pictures but cannot post here. Wish I could.
This forum should allow pictures to be posted!

Re: HV service laterals under a building [Re: SafetyWired] #212679
02/02/14 01:04 PM
02/02/14 01:04 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,287
Estero,Fl,usa
If there are no privacy issues with your employer/customer you can put them here

https://www.electrical-contractor.n.../5/1/Photos_Submitted_for_Discussio.html


Greg Fretwell
Re: HV service laterals under a building [Re: SafetyWired] #212692
02/03/14 11:44 AM
02/03/14 11:44 AM
Admin  Offline

Administrator
Member
Joined: Oct 2000
Posts: 3,516
NY, USA
Originally Posted by SafetyWired
Have tons of pictures but cannot post here. Wish I could.
This forum should allow pictures to be posted!
SafetyWired,

We do allow pictures to be posted. If under 1MB ea 2 can be uploaded directly with each post using the 'File Manager' link below the window where you type your Post.

We have a Photo Gallery for picture uploads under 4Mb ea:
https://www.electrical-contractor.net/forums/ubbthreads.php/forums/23/1/Photo_Gallery.html

We also have a Photo Upload website for larger photos at https://www.electrical-photos.com/ where you can upload electrical related photos into your own personal album and use the links to post pictures in this forum as well as others.

see tutorial here:
https://www.electrical-contractor.n...22/Photo_Upload_Tutorial.html#Post178222

Page 1 of 2 1 2

Featured:

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

 

Member Spotlight
Admin
Admin
NY, USA
Posts: 3,516
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 10
Popular Topics(Views)
249,289 Are you busy
187,226 Re: Forum
176,586 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.037s Queries: 16 (0.006s) Memory: 1.0298 MB (Peak: 1.2113 MB) Zlib enabled. Server Time: 2018-09-19 20:40:25 UTC