How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Jason Your Own Question

Jason
Jason, Service Technician
Category: Electrical
Satisfied Customers: 3622
Experience:  Over 15 years of experience in all types of installations, troubleshooting, and repairs.
9920183
Type Your Electrical Question Here...
Jason is online now
A new question is answered every 9 seconds

I have an underground electrical service running south from

Resolved Question:

I have an underground electrical service running south from a meter near my lot line to my house, east of this is also a underground phone line running parallel to this line with a space of 6 to 9 feet between them. I built a detached building which I am going to power with a 200 amp service panel. Since the property line is just east of the phone line and I have trees to the west of the current power cable I would like to run the new power cable parallel to the others in the space between the existing phone and power cable for 140 feet and then cross over or under the existing power cable to get to the new building.
I have not been able to find any info on doing this and was wondering if there are problems or restrictions when doing this. I will be direct burying the new cable in a 24"+ trench and using Alum 4/0,4/0,2/0 URD triplex
Submitted: 1 year ago.
Category: Electrical
Expert:  Jason replied 1 year ago.

Jason :

Hello. Welcome to Just Answer.

Jason :

I see no issues with what you have proposed, relative to crossing a new underground feed over or under an existing feed.

Jason :

However, I do have one suggestion for your installation.

Jason :

Actually, I do see one issue with your planned URD wire.

Jason :

Detached buildings require a 4 wire feed, per the NEC. Supplemental grounding via ground rods are also required. For a 200 amp service, you need 2 rods, spaced 6 feet apart.

Jason :

In addition, though it's not required, I would put the wire in PVC conduit. For a trench that long, especially.

Jason :

That way, if the wire ever fails (which some veteran electricians say aluminum is particularly prone to do), you simply pull it out and pull in new wire.

Customer:

I didn't think I would have to run 4 wires as I am not going to power off of the Breaker panel in the house. The meter is currently on a pedistal near the street, +/- 300' from where the power enters the house. My additional run to my new building would be Tapped to the meter by the power company and the added service would have it's own panel in the new building. I just wasn't sure if crossing cables causes any problems, or if I need to keep them 6" apart or have some other type of barrier. I could run the cable to the outside of the existing cable and not have to cross it but I would be trenching into the drip line of about ten pine trees. I'm not sure if the existing feed to the house is in conduit or not, I guess I will find out if or when I hand shovel that area. The soil where I live is pretty sandy and this type of cable is what was recommended.

Jason :

If you are tapping into a pedestal, that does change the type of wire you can use. Most likely, there isn't an earth ground source at the pedestal. That's a very atypical installation. Most utilities won't do an installation like that. It sounds like you will need another meter at the outbuilding. Most utilities only allow one meter per residence.

Jason :

You can establish your earth safety ground at the outbuilding, with ground rods, if the URD is coming from a utility pedestal. That means you do only need 3 conductors, as suggested previously.

Jason :

With the meter being at the street pedestal, as long as your new wire taps into the load lugs of the existing meter, the usage for the outbuilding will be tracked.

Jason :

That means a second meter would not be necessary. Was it your utility company who said you could use 3 wire URD?

Jason :

I would probably contact the local electrical inspector, just to make sure he'll sign off on it.

Jason :

Before beginning the work, that is.

Jason :

If you put the new feed in conduit, any concerns about distances between feeds would be unnecessary.

Jason :

A side note about using conduit... you won't have to dig the trench quite as deep. Feeds in pipe only need to be 18" deep, not 24".

Jason :

If you do decide to go direct burial (no pipe), when you get to the point of crossing the existing feed, I would go under it, not over it.

Customer:

It was the inspector that said the URD, the power co said they can tap the load side of the meter. Sounds like this is common in this area. If I were to use the conduit I could go 18" , what size of schedule 80 conduit would I need to use? My run to the garage is just under 200'.

Jason :

Let me consult my conduit sizing chart. Can you stand by?

Customer:

yes

Jason :

OK, just as I suspected, it is suggesting 2" conduit. However, for a run that long, I would go up at least one size. For the minimal increase in pipe, I would go up to 3" pipe. When it comes time to pull the wire, you'll be glad you did.

Jason :

There is 2 1/2" pipe available, if you only want to go up one size.

Customer:

yes

Jason :

Minimal increase in price, I meant to say.

Customer:

Thanks much.

Jason, Service Technician
Category: Electrical
Satisfied Customers: 3622
Experience: Over 15 years of experience in all types of installations, troubleshooting, and repairs.
Jason and other Electrical Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
< Last | Next >
  • http://ww2.justanswer.com/uploads/mikepettinato/2009-9-4_41145_DSC005132.jpg Mike's Avatar

    Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
  • http://ww2.justanswer.com/uploads/WI/WireitUp/2012-6-17_18212_Photo00006.64x64.jpg Jason's Avatar

    Jason

    Service Technician

    Satisfied Customers:

    3278
    Over 15 years of experience in all types of installations, troubleshooting, and repairs.
  • http://ww2.justanswer.com/uploads/MI/MikeG2010/2012-6-7_192640_IMG01612.64x64.jpg Mike G.'s Avatar

    Mike G.

    Master Electrician

    Satisfied Customers:

    5318
    Proven Professional 45 years Experience
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Master Electrician

    Satisfied Customers:

    2149
    Contractor-40 Years in the ElectricalTrade
  • http://ww2.justanswer.com/uploads/electrifier/2008-12-16_200429_headbob1.jpg electrifier's Avatar

    electrifier

    Master Electrician

    Satisfied Customers:

    1454
    Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Master Electrician

    Satisfied Customers:

    1115
    Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain
  • http://ww2.justanswer.com/uploads/UR/urelectrician/2012-9-28_223652_JustAnswerPic.64x64.jpg Kevin's Avatar

    Kevin

    Licensed Electrician

    Satisfied Customers:

    993
    27 years as a Licensed Electrical Contractor in Illinois, 5 year college Electrical Instructor, Former Electrical Inspector, Diploma in Digital Electronics, Former Illinois Licensed Home Inspector