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#212599 - 01/26/14 09:40 AM HV service laterals under a building
SafetyWired Offline
Member

Registered: 07/08/13
Posts: 44
Loc: 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.

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#212601 - 01/26/14 10:47 AM Re: HV service laterals under a building [Re: SafetyWired]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: 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

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#212602 - 01/26/14 10:51 AM Re: HV service laterals under a building [Re: HotLine1]
SafetyWired Offline
Member

Registered: 07/08/13
Posts: 44
Loc: 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

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#212631 - 01/27/14 06:10 PM Re: HV service laterals under a building [Re: SafetyWired]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
Voltage???
Locations??
Where Metered???
Transformer???
Service Disconnect???

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#212636 - 01/28/14 05:58 AM Re: HV service laterals under a building [Re: SafetyWired]
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: 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

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#212664 - 01/30/14 08:06 PM Re: HV service laterals under a building [Re: Yoopersup]
SafetyWired Offline
Member

Registered: 07/08/13
Posts: 44
Loc: 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

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#212665 - 01/30/14 08:14 PM Re: HV service laterals under a building [Re: SafetyWired]
SafetyWired Offline
Member

Registered: 07/08/13
Posts: 44
Loc: 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.

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#212678 - 02/02/14 08:08 AM Re: HV service laterals under a building [Re: SafetyWired]
SafetyWired Offline
Member

Registered: 07/08/13
Posts: 44
Loc: 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!

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#212679 - 02/02/14 09:04 AM Re: HV service laterals under a building [Re: SafetyWired]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
If there are no privacy issues with your employer/customer you can put them here

http://www.electrical-contractor.net/for..._Discussio.html
_________________________
Greg Fretwell

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#212692 - 02/03/14 07:44 AM Re: HV service laterals under a building [Re: SafetyWired]
Webmaster Offline

Administrator
Member

Registered: 10/07/00
Posts: 3142
Loc: 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:
http://www.electrical-contractor.net/forums/ubbthreads.php/forums/23/1/Photo_Gallery.html

We also have a Photo Upload website for larger photos at http://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:
http://www.electrical-contractor.net/for...html#Post178222

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