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Outdoor NEMA 14-50 Enclosure

Discussion in 'Model 3: Battery & Charging' started by Runt8, Aug 20, 2018.

  1. Runt8

    Runt8 Active Member

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    Has anyone found a good enclosure that allows the UMC to hang down and be relatively protected from the elements?

    Thanks!
     
  2. COrocket

    COrocket Member

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  3. ucmndd

    ucmndd Active Member

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    That’s what I use. No issues to speak of so far, 20 months in.

    You can’t close/lock it while the UMC is plugged in, but the cover keeps the water off it.
     
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  4. Jdee2wheels

    Jdee2wheels Member

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    Are you using a Gen 1 or Gen 2 UMC? I'm pretty sure I bought the same enclosure from Lowes and it does close all the way with the Gen 2 adapters.
     
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  5. ucmndd

    ucmndd Active Member

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    Sorry, gen 1. Thanks for pointing that out.
     
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  6. eprosenx

    eprosenx Member

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    I vastly prefer this one:

    The Eaton one is way better than the other one I bought from Home Depot (not sure if it was the GE one linked above or not)

    https://www.homedepot.com/p/Eaton-50-Amp-1-Space-1-Circuit-Temporary-RV-Power-Outlet-Box-CHU1S/100565603

    Now none of these are going to cover your EVSE, but they will cover the plug/receptacle.

    I personally am not convinced that UMC units left outdoors all the time is a really good idea from a security and shock hazard standpoint. By default most say NEMA 14-50 receptacles I have seen are not on GFCI protected circuits. So there is a shock hazard when plugging them in upstream of the EVSE. The EVSE has its own built in GFCI so everything downstream is protected.

    Note that in 2017 NEC in Article 625 is a new requirement that all EVSE receptacles be GFCI protected. Now I personally think this is an onerous requirement for receptacles installed in dry locations (like a garage) since the EVSE has built in GFCI protection, but for outdoor use I absolutely see the merits. The issues are that the GFCI breakers are stupid expensive (over $100) and you can't get them for all model of panels, you can't use Tandem breakers, etc... Oregon stripped many of the new GFCI requirements out of the 2017 NEC when they adopted it, but the committee did not have a chance to review this provision since it was added to 2017 NEC last minute through an emergency process.

    So with that all being said, I am a much bigger fan of installing HPWC units outdoors. They don't require a GFCI breaker since they are hard wired and they are much more environment and vandal resistant.
     
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  7. GregRF

    GregRF Squirrel Power

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  8. Runt8

    Runt8 Active Member

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    Do you happen to know which subsection this is in?

    Thanks!
     
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  9. eprosenx

    eprosenx Member

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    625.54 or 625.56 I believe. Am at dinner on my phone. I have posted about it elsewhere on this forum.
     
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  10. Runt8

    Runt8 Active Member

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    Great, thanks!
     
  11. Runt8

    Runt8 Active Member

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    Looked it up, it is 625.54 - good memory!

    Does this apply to a 240v circuit? Obviously 240 > 150 but are they considering each 120v phase separately?
     
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  12. tpham07

    tpham07 Active Member

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    thinking about doing this for a future house ill be living at, as it has no garage. Ill just tell the installer that its for an RV and no questions will be asked about EV charging :)

    my only hope is nobody steals the UMC as i dont plan on unplugging it everyday.
     
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  13. Lloyd

    Lloyd Well-Known Member

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    The breaker will cost about an additional $100, but it does add safety.
     
  14. eprosenx

    eprosenx Member

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    Yes, this applies. Residential service in the US is 120/240v split phase, so this means neither "hot" leg is more than 150 volts to ground. So yes, they intend to require GFCI's on *ALL* EV outlets.

    Hah, yes, I have never seen RV outlets with GFCI breakers, although, there does seem to be some debate as to if 2017 NEC intended to require them:

    GFCI and RV parks

    I think Oregon stripped a lot of the higher amperage GFCI requirements out of their adoption of the 2017 NEC (probably too costly still to justify).

    I would call out that telling your electrician something is intended for an TV might result in different NEC load calculations (since RV's probably typically draw a fraction of what an EV does), so it could in theory make a difference (but yeah, in most practical situations, probably not).

    As to the stealing of the UMC: Again, that is one reason I am a fan of the Wall Connector (though I am sure there are ways as others pointed out of building a custom enclosure for it).
     
  15. tpham07

    tpham07 Active Member

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    The house has 100A service, but i'm pretty sure it can handle a 50A outlet that only charges up to 32A anyways (gen2 UMC). My parents house built in the 50s has a wall connector on a 50A circuit and its also on 100A service.

    It's a small house (~1600sqft) in rhode island. If the electrician doesn't think it can support a 50A circuit though, ill relent and get a Wall connector on a smaller circuit. even 24A charging will fulfill my daily needs. I don't want to go that route though because i will be living there temporary, so a NEMA 14-50 makes more sense for temporary solutions vs long term (with the wall connector).
     
  16. Runt8

    Runt8 Active Member

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    I spoke to my electrician friend, who spoke to the engineer who designs all of the car charging installations for his company (a fairly large electrical company). He says that GFCI protection is not required for a 240v circuit.

    I will be calling and talking to one of the city inspectors later today, hopefully he can bring some clarity to the situation.
     
  17. eprosenx

    eprosenx Member

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    I am genuinely curious what he would say about NEC 625.54. Would you mind asking him (send him a copy of the text of the article)?

    GFCI is not required for hard wired HPWC’s but 625.54 is very clear that it is required for receptacles.

    It is also possible that he is correct in the market he works in - either they may not have adopted 2017 NEC yet or they may have modified it.

    Please report back on what your electrician friend and inspector say!
     
  18. ezevphl

    ezevphl Member

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    I was just about to get that. So theres not enough space with the plug?

    Has anyone found one that can be closed when plugged in?
     
  19. ucmndd

    ucmndd Active Member

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    Note my response was for the original first gen UMC, not the gen 2 unit that comes with Model 3. Someone else reported further down that the cover CAN completely close with the gen 2 plug.
     
  20. Runt8

    Runt8 Active Member

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    #20 Runt8, Aug 21, 2018
    Last edited: Aug 21, 2018
    I specifically mentioned 625.54, he said it doesn't apply to 240v circuits. Therefore 625.22 is the one to pay attention to. His words:

    We do follow the 2017 NEC here. I'm wondering if they are getting mixed up between a hardwired EVSE vs the 14-50 outlet + UMC. As far as I know, the UMC doesn't have any sort of protection built in, correct?

    I tried to connect with the city inspector (seeing as how he will be the one doing the actual inspection) but I wasn't able to get him on the phone today. He's supposed to call back so I will update this thread when I hear from him.
     

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