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Thread: Question on using aluminum conductor romex for a sub panel feeder in a residence???

  1. #1
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    Question on using aluminum conductor romex for a sub panel feeder in a residence???

    My electrician suggested using an aluminum conductor romex to feed a sub panel in a standard residence (240V single phase). The sub panel will be a 200A rated panel and the breaker for the romex is a 200A circuit breaker. The distance is approx. 110' long. Is there a romex with aluminum conductors available in an adequate size/gauge for this application??? Any input would be greatly appreciated. Thanks

  2. #2
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    deleted post
    "Appliances and wiring will burn out to protect fuses"

  3. #3
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    You need to use another wiring method. Either MC cable or SE cable would work.

    III. Construction Specifications

    334.104 Conductors. The 600-volt insulated conductors
    shall be sizes 14 AWG through 2 AWG copper conductors
    or sizes 12 AWG through 2 AWG aluminum or copper-clad
    aluminum conductors. The communications conductors
    shall comply with Part V of Article 800
    Rob

    Chief Moderator

    All responses based on the 2011 NEC unless otherwise noted

  4. #4
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    I just did a little research. It looks like the following will be acceptable:

    AL 4/0 SER 200 A Aluminum 4/0-4/0-4/0-2/0 Service feeder wire for 200A breaker panel

    Any input on this?

  5. #5
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    Quote Originally Posted by jango View Post
    I just did a little research. It looks like the following will be acceptable:

    AL 4/0 SER 200 A Aluminum 4/0-4/0-4/0-2/0 Service feeder wire for 200A breaker panel

    Any input on this?
    Yeah, 4/0 AL is not big enough for a sub panel at 200 amps.
    "Electricity is actually made up of extremely tiny particles called electrons, that you cannot see with the naked eye unless you have been drinking."

  6. #6
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    Yea may not work depending on the code version you are working under.
    Used to do it but not now, in my area unless you use a lower breaker say 175amps.
    Many don't even realize.
    You can use a lower breaker to comply.

  7. #7
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    Based on 2008 and assuming the subpanel will supply ALL of the loads, 310.15(b)(6) allows a 4/0 aluminum for a 200Amp feeder.

    Am i missing something?
    Edward
    Education is a progressive discovery of our ignorance.

  8. #8
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    You might be missing something. Is it a sub-panel or the main panel but located away from the meter? I believe for a sub-panel it's 310.16 and 4/0 Alum is 180a at 75 degrees. This came up a while ago with using #2 SER for a 100a sub-panel. It is only rated 90a.

  9. #9
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    When can you use the next higher breaker. I don't think they make a 180?

  10. #10
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    Mike P. Columbus Ohio
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    Quote Originally Posted by edward View Post
    Based on 2008 and assuming the subpanel will supply ALL of the loads, 310.15(b)(6) allows a 4/0 aluminum for a 200Amp feeder.

    Am i missing something?
    Are you saying that you have a disco (only) ahead of this panel?
    Inspector Mike
    ESI

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