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Thread: New to the Forum; First Post; Distance Allowed for Mobile Home Feeder Wire

  1. #1
    DIY Junior Member kailor's Avatar
    Join Date
    Dec 2010
    Location
    Huntsville, Alabama
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    Default New to the Forum; First Post; Distance Allowed for Mobile Home Feeder Wire

    Hello all! This is my first post of many to come. I'm a fairly handy DIY'er. These internet forums are so helpful in learning and saving money, but most importantly, making well-informed decisions. Well, so much for blowing sunshine!

    I'm installing a mobile home on some property I own. Here's the skinny:
    Feeder wire is aluminum 4/0, 4/0, 2/0, #4.
    240v single-phase
    Service load in the mobile home is 200A.

    The Voltage Drop Calculators on the internet seem to vary between each one. Keeping the voltage drop less than 3%:

    Q: What is the max distance that I can run the feeder wire (I will NOT be upsizing or downsizing this feeder wire) from the service pole without the lights blinking everytime the heat or AC comes on? What would be the max distance that you as a professional would run if this was your project to obtain proper electrical service?

    Q: Code here in North Alabama requires schedule 40 gray PVC conduit when above ground. What size diameter conduit should I use or should I just go with direct burial when below ground?

  2. #2
    DIY Member jetlag's Avatar
    Join Date
    Dec 2009
    Location
    Ga.
    Posts
    84

    Default

    Quote Originally Posted by kailor View Post
    Hello all! This is my first post of many to come. I'm a fairly handy DIY'er. These internet forums are so helpful in learning and saving money, but most importantly, making well-informed decisions. Well, so much for blowing sunshine!

    I'm installing a mobile home on some property I own. Here's the skinny:
    Feeder wire is aluminum 4/0, 4/0, 2/0, #4.
    240v single-phase
    Service load in the mobile home is 200A.

    The Voltage Drop Calculators on the internet seem to vary between each one. Keeping the voltage drop less than 3%:

    Q: What is the max distance that I can run the feeder wire (I will NOT be upsizing or downsizing this feeder wire) from the service pole without the lights blinking everytime the heat or AC comes on? What would be the max distance that you as a professional would run if this was your project to obtain proper electrical service?

    Q: Code here in North Alabama requires schedule 40 gray PVC conduit when above ground. What size diameter conduit should I use or should I just go with direct burial when below ground?
    1- You dont have to worry about the voltage drop because the code wont allow you to put the service pole more than 30 ft from the mobile home
    Nec 550 .32 (a)
    2- The 4/0 4/0 2/0 #4 is use-2 called alumiflex mobile home feeder. It is for direct burial . Use a short 2" pvc to go down from the disconnect on the pole to 18" below grade , and another pvc 2" 18 below grade to come up at the mobile home . Use the pvc to run to the mobile home panel . Most places allow the feeder to be burried 18 " but some require 24 " . You can run the pvc all the way if you want but dont have to underground. If you dont have a lot of experience with this and you have a lot of 90 deg bends in the conduit ,I would use 2 1/2 '' pvc instead of 2 " , it is very hard to install the 4/0 in 2 '' pvc . The 2 1/2 will slide over and glue to a 2 " that runs up into the panel inside so you dont have to cut out for a bigger pipe . you also need to slide the conduit and fittings over the wire one piece at a time , this is actually against the code but you will never get the cables in if you run all the conduit first and try to pull the wire through
    Last edited by jetlag; 12-02-2010 at 06:07 PM.

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