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  1. Thread: grounding

    by rbalex
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    22$$
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    580

    In that case you may want to review Section...

    In that case you may want to review Section 250.4(B)(1).
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    138

    I'm confused. Are the PLC/DCS inputs acting as...

    I'm confused. Are the PLC/DCS inputs acting as the circuits' power supplies?
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    569

    I wish it still had its own Section, but it's...

    I wish it still had its own Section, but it's been relegated to the last sentence in 90.1(A). It used to be 90.1(C) in 2012 and earlier. It still applies to rookies of all shades including...
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    147

    If diesel is the only fuel dispensed, Then there...

    If diesel is the only fuel dispensed, Then there is no problem. Diesel is not considered a flammable material at normal temperatures. It isn't listed as flammable in NFPA 497, Table 4.4.2.

    If...
  5. Thread: 500.8 exception

    by rbalex
    Replies
    6$$
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    362

    I have been avoiding this since I don't agree...

    I have been avoiding this since I don't agree with the Exception.. The original Proposal suggested only 3-1/2 threads engaged.

    The history is in the 2005 cycle ROP/ROC. Check the "Current & ...
  6. Replies
    1$$
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    181

    For Division 1, there is an "exception" within...

    For Division 1, there is an "exception" within the Exception:"...The concrete encasement shall be permitted to be omitted where subject to the provisions of 514.8 Exception No.2. and 515.8(A). ..." ....
  7. Here's your problem. That is a UL "Recognized...

    Here's your problem. That is a UL "Recognized Component" (the backwards "UR"). That means it is intended to be used in specific equipment and has no "general" application. Class I, Division 2 has no...
  8. Your link has a problem. If otherwise used...

    Your link has a problem.

    If otherwise used within their intended design applcation, there is no additional prohibition with created by use in Class I, Division 2.
  9. I don't know which posts you're referring to but...

    I don't know which posts you're referring to but you need to realize purging, pressurizing and ventilation each have different purposes and effects.

    If you were using conventional IEC Zones (not...
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    2$$
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    197

    Sorry Don, you have me on that one. I would...

    Sorry Don, you have me on that one.

    I would suggest contacting OZ-Gedney. They have a healthy range of specialty items not listed in their catalog.
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    1$$
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    203

    I've started working on this a half dozen times....

    I've started working on this a half dozen times. We have a serious illness in the family and I keep getting called away.


    By itself, there is no problem with the tray penetrating the top of the...
  12. Replies
    1$$
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    178

    There is no universal requirement for...

    There is no universal requirement for electricians. I personally know of no such local or facility management requirement either.

    It is more likely that a local jurisdiction or facility management...
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    6$$
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    569

    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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    170

    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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    272

    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,...
  16. Replies
    6$$
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    569

    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.
    ...
  17. 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...
  18. Replies
    4$$
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    305

    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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    144

    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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    358

    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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    472

    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...
  22. Replies
    4$$
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    329

    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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    329

    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)
    ...
  24. Replies
    6$$
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    418

    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...
  25. Replies
    6$$
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    418

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

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