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Type: Posts; User: rbalex

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  1. Replies
    4$$
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    266

    The "proper" NEC term is boundary, rather than...

    The "proper" NEC term is boundary, rather than perimeter seal and it isn't just limited to conduit systems.

    There are certain multiconductor cable constructions, such as unjacketed, interlocked...
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    1$$
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    74

    Start with reviewing Section 501.105(B) very...

    Start with reviewing Section 501.105(B) very carefully. You will most likely find the kW-hr meter isn't required to be explosionproof in the first place.

    Then read Section 501.10(B)(3) very...
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    3$$
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    122

    There is no exception. As you already noted,...

    There is no exception. As you already noted, exposed PLTC is not a permissible wiring method in Class I, Division 1.

    For those compelled to point it out, it could be installed under Article 504,...
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    4$$
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    266

    Section 501.15(E) went through a major rewrite in...

    Section 501.15(E) went through a major rewrite in 2014 and the editing created a serious unintended consequence/misunderstanding.

    However, since Ohio is still on the 2011 it easier to explain.
    ...
  5. You have stumbled on another difference between...

    You have stumbled on another difference between US and European practices. For US domestic it is electrical area classification; for most European and other IEC facilities it is simply area...
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    4$$
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    Other than the fact that NFPA 72 isn't a basis...

    Other than the fact that NFPA 72 isn't a basis for classification, I don't know enough about the operation to make much of a comment.

    Propane is one of the nastiest common volatiles out there....
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    1$$
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    122

    Under usual conditions, you would be invited to...

    Under usual conditions, you would be invited to submit a Public Information comment for the 2020 NEC. However, in this case, Article 511 is largely extracted from NFPA 30A and you would need to get...
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    3$$
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    245

    I agree with Augie that a CSA listing should be...

    I agree with Augie that a CSA listing should be acceptable. One caveat is CSA is technically only a NRTL when they certify to a Recognized American National Safety Standard.

    That said, the...
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    11$$
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    398

    I'm sure it will be too - since it has been in...

    I'm sure it will be too - since it has been in virtually every Code cycle since 1996. I have been amazed how "creative" CMP7 has been in rejecting a construction that is obviously superior to NM in...
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    4$$
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    219

    You must first understand that the US isn't...

    You must first understand that the US isn't monolithic withy respect to the NEC. Not many, but some jurisdictions still use the 2005. Quite a few are still on the 2008 and 2011 editions. See this...
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    4$$
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    219

    It depends on whether you are installing in the...

    It depends on whether you are installing in the US or an IEC regulated facility. (My Australian experience is very dated and, while I have a few kiwi friends, I have no NZ design experience at all)
    ...
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    6$$
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    Sorry, but under the conditions you cited, there...

    Sorry, but under the conditions you cited, there is no Code compliant solution.

    I've done methane reclamation/collection. I've done land fill reclamation. I have done Los Angeles/Long Beach shore...
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    6$$
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    303

    No; not even under 501.10(A)(1)(a) Exception.

    No; not even under 501.10(A)(1)(a) Exception.
  14. Replies
    6$$
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    303

    I don't say this often but about all I can say at...

    I don't say this often but about all I can say at this point is your spec/design has painted you into a corner.

    I would like to know the standard used for classifying the underground. If it...
  15. Thread: Class 1 Div 2 ?

    by rbalex
    Replies
    10$$
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    473

    If you read the IN to the NEC [2014], Article 516...

    If you read the IN to the NEC [2014], Article 516 Title you'll find the relevant information is extracted from NFPA 33 and 34. They are also both referenced in [2014] Section 500.4(B) IN 4.

    Since...
  16. Thread: Class 1 Div 2 ?

    by rbalex
    Replies
    10$$
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    473

    Actually, Type SO is "Extra Hard Usage" [Table...

    Actually, Type SO is "Extra Hard Usage" [Table 400.4] and where Section 501.140 applies, it's fine.

    Do you actually believe that I don't know when Section 501.140 would apply?;)
  17. Thread: Class 1 Div 2 ?

    by rbalex
    Replies
    10$$
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    473

    I usually recommend starting with you insurer....

    I usually recommend starting with you insurer. I'm always surprised when they don't get intimately involved with a classified facility.

    If they aren't helpful, I'd contact a professional engineer....
  18. Thread: Class 1 Div 2 ?

    by rbalex
    Replies
    10$$
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    473

    First, it is an NEC requirement to have your...

    First, it is an NEC requirement to have your electrical area classification properly documented. [Section 500.4(A)] The booth without such documentation is already in violation. You need someone...
  19. Replies
    13$$
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    424

    Your new scenario statement is a bit confusing to...

    Your new scenario statement is a bit confusing to me. To clarify, the diagram on the left has the union between the enclosure and the seal AND there is NO coupling at grade. With or without the lower...
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    13$$
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    424

    The left diagram with or without the lower seal...

    The left diagram with or without the lower seal would be fine if the conduit was run from grade to the seal.
    The right diagram fails with the union between the seal and grade.
    Section...
  21. Replies
    4$$
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    243

    Note: I referenced the 2014 NEC in my previous...

    Note: I referenced the 2014 NEC in my previous post. The Figure is 516.3(C)(1) in earlier versions.
  22. Replies
    4$$
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    243

    Your original question stated the location was...

    Your original question stated the location was definitely classified Class I, Division 1. In that case, luminaries in the classification must be suitable for the classification.

    It is conceivable...
  23. Replies
    4$$
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    243

    No. The most common workaround is to install the...

    No. The most common workaround is to install the luminaires outside the room with a window permitting the light.
  24. There are no extrodinary requirements in...

    There are no extrodinary requirements in classified locations beyond installing the lightning protection system consistently with standard practices such as NFPA 780 or API 2003. Both are reference...
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    6$$
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    371

    Correction to above post. Various protection...

    Correction to above post. Various protection techniques are defined in Section 500.2. Their applications and limits are described in Section 500.7 rather than 500.?8.
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