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HV service laterals under a building #212599 01/26/14 12:40 PM
Joined: Jul 2013
Posts: 44
SafetyWired Offline OP
Member
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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Re: HV service laterals under a building [Re: SafetyWired] #212601 01/26/14 01:47 PM
Joined: Apr 2002
Posts: 7,121
HotLine1 Offline
Member
"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 01:51 PM
Joined: Jul 2013
Posts: 44
SafetyWired Offline OP
Member
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 09:10 PM
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline
Member
Voltage???
Locations??
Where Metered???
Transformer???
Service Disconnect???

Re: HV service laterals under a building [Re: SafetyWired] #212636 01/28/14 08:58 AM
Joined: Jun 2004
Posts: 1,273
T
Tesla Offline
Member
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 01/30/14 11:06 PM
Joined: Jul 2013
Posts: 44
SafetyWired Offline OP
Member
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 01/30/14 11:14 PM
Joined: Jul 2013
Posts: 44
SafetyWired Offline OP
Member
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 11:08 AM
Joined: Jul 2013
Posts: 44
SafetyWired Offline OP
Member
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 12:04 PM
Joined: Jul 2004
Posts: 9,411
G
gfretwell Offline
Member
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 10:44 AM
Joined: Oct 2000
Posts: 3,588
Admin Offline
Administrator
Member
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

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