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Thread: 400 amp residential service

  1. #1
    Join Date
    May 2004
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    Michigan
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    400 amp residential service

    Hi, I am hoping some one has some pics of a 400 amp service they have done( and are willing to post). This will be my first one. I was wanting to come out of the meter can with two sets of 4/0 alum SE cable with side by side 200 panels directly behind meter can. All the pics i can find all have pvc or have a gutter put in. I was hoping to see how it looks before going ahead. Thanks

  2. #2
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    Chapel Hill, NC
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    Depending on what code year you are on, seu may only be rated 60C so that is why you probably see conduit to the interior panels.

    What we do is mount a 400 amp meter base and pipe to each interior panel. 4/0 is conduit is rated 180 so you have 360 amps available. Sometimes we just run 3/0 copper
    They say I killed a man named Greg and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky



  3. #3
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    Dennis, I am in michigan 2014 nec.

  4. #4
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    The last one I did was an under-ground service into a CT cabinet. I would check with your POCO to see what their requirements are.

  5. #5
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    Here is what the 2014 styates

    (4) Installation Methods for Branch Circuits and Feeders.
    (a) Interior Installations. In addition to the provisions of
    this article, Type SE service-entrance cable used for interior
    wiring shall comply with the installation requirements of Part
    II of Article 334, excluding 334.80.
    Where installed in thermal insulation the ampacity shall be
    in accordance with the 60°C (140°F) conductor temperature
    rating. The maximum conductor temperature rating shall be
    permitted to be used for ampacity adjustment and correction
    purposes, if the final derated ampacity does not exceed that for
    a 60°C (140°F) rated conductor.
    They say I killed a man named Greg and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky



  6. #6
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    Quote Originally Posted by Dennis Alwon View Post
    Here is what the 2014 styates

    Dennis, that article seems to be contradicting itself.

  7. #7
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    Aug 2003
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    Bumping an old thread rather than ask the same question.

    I've got the exact situation. "400" amp service (the power company calls it 360 and 400 interchangeably).

    Meter on the outside of the wall. A pair of 200 amp panels on the inside of the wall.

    The code is rather confusing on what needs to be run. Does 4/0 exposed really cut it? Does it need to be in a conduit? At which point, why not just run copper in a conduit? It's going all of 4 feet. Not like a few feet of copper is a big expense.

  8. #8
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    Quote Originally Posted by ddecart View Post
    Bumping an old thread rather than ask the same question.

    I've got the exact situation. "400" amp service (the power company calls it 360 and 400 interchangeably).

    Meter on the outside of the wall. A pair of 200 amp panels on the inside of the wall.

    The code is rather confusing on what needs to be run. Does 4/0 exposed really cut it? Does it need to be in a conduit? At which point, why not just run copper in a conduit? It's going all of 4 feet. Not like a few feet of copper is a big expense.
    What do you mean by 4/0 exposed? Personally I would run conduit and use 3/0... You can use 4/0 aluminum however that is only rated 180 amps at 75C so you will only have a 360 amp service
    They say I killed a man named Greg and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky



  9. #9
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    Quote Originally Posted by ddecart View Post
    Bumping an old thread rather than ask the same question.

    I've got the exact situation. "400" amp service (the power company calls it 360 and 400 interchangeably).

    Meter on the outside of the wall. A pair of 200 amp panels on the inside of the wall.

    The code is rather confusing on what needs to be run. Does 4/0 exposed really cut it? Does it need to be in a conduit? At which point, why not just run copper in a conduit? It's going all of 4 feet. Not like a few feet of copper is a big expense.
    If you think you can't run aluminum conductors in a conduit you are wrong, most of the time you have to.

  10. #10
    Join Date
    Aug 2003
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    26
    Quote Originally Posted by Dennis Alwon View Post
    What do you mean by 4/0 exposed? Personally I would run conduit and use 3/0... You can use 4/0 aluminum however that is only rated 180 amps at 75C so you will only have a 360 amp service
    Sorry. One of those "I knew what I meant" moments.

    SER in conduit vs out of conduit (exposed).
    For service entrance in a residential application, would 4/0 not fall under the "next standard rating" and qualify as 200A in each feed?

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