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  1. #1
    Join Date
    Jan 2008
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    Question Buried PVC/Conduit Under Driveway

    I would like to run 110v power underneath my driveway to a LV transformer powering a couple driveway lights embedded in a block wall. I know LV can be rather shallow but what is the recommended depth for 110v? I was thinking of using direct burial wire within a conduit. Any recommendations? Any crush concerns for the conduit?

    Thanks.

  2. #2
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    Default Re: Buried PVC/Conduit Under Driveway

    It might be better to locate the transformer at a receptacle and run the LV cable to the lights. The reason I recommend this is there usually aren't any code issues for running LV lighting .

    Depending on where you live 18 inches might acceptable for depth for the conduit.

  3. #3
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    Default Re: Buried PVC/Conduit Under Driveway

    In my area buried conduit with power must be 36" down.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  4. #4
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    Default Re: Buried PVC/Conduit Under Driveway

    Per 08 National Electrical Code:
    Table 300.5

    Residential driveways, parking areas used only for dwelling related purposes

    18 for direct burial and all types of conduit listed for direct burial.

    The exception to this is resi circuits 120volts or less, 20amps or less and GFCI protected can be 12.

    Wonder why it needs to be so deep in Jacks area? In no case does the NEC require more than 24 of cover.

    Good to check with your local codes though.

  5. #5
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    Default Re: Buried PVC/Conduit Under Driveway

    Quote Originally Posted by kentvw View Post
    Per 08 National Electrical Code:
    Table 300.5

    Residential driveways, parking areas used only for dwelling related purposes

    18 for direct burial and all types of conduit listed for direct burial.

    The exception to this is resi circuits 120volts or less, 20amps or less and GFCI protected can be 12.

    Wonder why it needs to be so deep in Jacks area? In no case does the NEC require more than 24 of cover.

    Good to check with your local codes though.
    Pretty much identical here ... even in the frozen tundra of the Great White North.

  6. #6
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    Default Re: Buried PVC/Conduit Under Driveway

    Here's something to consider . If you run the 120v ckt. under the driveway , you won't have the voltage drop issue to deal with . Low voltage lighting works best with short runs of wire and a healthy voltage supply . Your original post sounds like a sound idea .

  7. #7
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    Default Re: Buried PVC/Conduit Under Driveway

    Quote Originally Posted by djohns View Post
    Here's something to consider . If you run the 120v ckt. under the driveway , you won't have the voltage drop issue to deal with . Low voltage lighting works best with short runs of wire and a healthy voltage supply . Your original post sounds like a sound idea .
    True ... I guess it would depend on how far of a run for the LV cable and the type of transformer used.
    The suggestion of running the LV cable instead of 120v would be simpler to deal with if the circumstance allowed.

    Here's some good info. :http://www.outdoorlighting.learnabou...age-lights.htm

  8. #8
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    Default Re: Buried PVC/Conduit Under Driveway

    Are you talking about the 24 foot length or the narrower width?

  9. #9
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    Default Re: Buried PVC/Conduit Under Driveway

    Quote Originally Posted by kentvw View Post
    Per 08 National Electrical Code:
    Table 300.5

    Residential driveways, parking areas used only for dwelling related purposes

    18” for direct burial and all types of conduit listed for direct burial.

    The exception to this is resi circuits 120volts or less, 20amps or less and GFCI protected can be 12”.

    Wonder why it needs to be so deep in Jacks area? In no case does the NEC require more than 24” of cover.

    Good to check with your local codes though.
    That's what the building inspector said to run power to my shop.
    I learned a long time ago that NEC doesn't mean a lot locally. I was installing some equipment at an asphalt plant in another state, the electrical inspector said it didn't meet code, I showed him the NEC requirements and explained that we exceed all of them and he said "I don't get a damn what the NEC says in this state we require it this way!" Needless to say I had to redesign, no ticky no worky no checky.
    Jack
    Last edited by JLMCDANIEL; 01-26-2008 at 07:27 PM.
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  10. #10
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    Default Re: Buried PVC/Conduit Under Driveway

    Quote Originally Posted by JLMCDANIEL View Post
    the electrical inspector said it didn't meet code, I showed him the NEC requirements and explained that we exceed all of them and he said "I don't get a damn what the NEC says in this state we require it this way!"
    Unfortunately, all states, all counties, all cities, and some inspectors are this way. Ultimately, it is the inspector's discretion as to how to interpret the intent of the code, within the guidelines of their jurisdiction. I've worked in half a dozen different counties and cities in this state and every single one of them have peculiarities that are unique unto themselves. Code is a nice guideline, but just know the natives will have a difference of opinion.

    Sort of on this subject, has anyone noticed a difference in the ease/difficulty in procuring permits depending on the size of the municipality and it's relation to civilization? Here where I live, you can write off at least 2 hours of your life - hating ever second of it - to get a permit for even the smallest of items, regardless of being in the city office or the county office. I've worked in other, more remote areas where I was in and out in less than 15 minutes (no exaggeration) and laughed and enjoyed my time with the fine folks behind the counter (again, no exaggeration).

    That's it! I quit! I'm moving in with ****ie! He doesn't have to worry about such things.

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