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Type: Posts; User: rbalex

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  1. Replies
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    I suggest reviewing the definition of combustible...

    I suggest reviewing the definition of combustible dust in Section 500.2. The odds are, if the grain is simply crushed, it is not classified at all.
  2. Do the contract drawings specify explosionproof...

    Do the contract drawings specify explosionproof flexible couplings?

    I still believe the contract drawings are using excessive classifications. This is a common problem for people who do not...
  3. It took me a while to find it but the UL...

    It took me a while to find it but the UL application data is here. While there is no length restriction, there are other things to note. Personally, I think it's just a bad design.
  4. In this case, if UL does not restrict it,...

    In this case, if UL does not restrict it, NFPA/NEC won't either.

    It will be incredibly expensive and you may still have support issues.

    Unless you are doing painting, is difficult to believe...
  5. They are "couplings" because of they are a entire...

    They are "couplings" because of they are a entire factory assembly; that is, the terminations cannot be field installed.

    UL does not restrict the maximum length; however, most manufacturers have...
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    Continuation of this thread may be found here...

    Continuation of this thread may be found here.
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    A word of caution. While manufacturing...

    A word of caution. While manufacturing explosionproof flexible couplings is not "high-tech" it does take very specialized processes.
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    This is a link to a typical manufacturer's...

    This is a link to a typical manufacturer's product: http://www.cooperindustries.com/content/dam/public/crousehinds/industrial-products/catalog-pdfs/fittings/ec_couplings.pdf.
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    8$$
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    Technically, there is no explosionproof flexible...

    Technically, there is no explosionproof flexible conduit. It is an explosionproof flexible coupling. They are very expensive. It must be a listed factory manufactured product.

    Theoretically, you...
  10. Replies
    1$$
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    It depends. Housekeeping and total emissions...

    It depends. Housekeeping and total emissions during maintenance play a major part of the analysis. A review of NFPA 499, especially Chapter 6, will be helpful.

    I might be concerned the interior...
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    1$$
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    It has indeed been discussed many times...

    It has indeed been discussed many times. A keyword search on "ductseal" will reveal several.

    That said, the problem with using EY/EYS/EYD/etc., is part of their listing includes using an...
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    "CMP" means Code Making Panel. The membership of...

    "CMP" means Code Making Panel. The membership of each CMP and the Articles it covers is listed just after the NEC Table of Contents.
  13. It's fine; it's just a big waste of money. Any...

    It's fine; it's just a big waste of money. Any protection techniques acceptable in Division 1 are acceptable in Division 2. You need to read NFPA 496.
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    Those notes are for CMP1 only and they aren't...

    Those notes are for CMP1 only and they aren't truly "official" until after the balloting/recirculation stage (7/10/15) and posted (7/17/15) . There is a schedule on the link I posted earlier. Click...
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    475

    Mid July this cycle: ...

    Mid July this cycle: http://www.nfpa.org/codes-and-standards/document-information-pages?mode=code&code=70&tab=nextedition
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    475

    Typically it is mid June but I haven't seen a...

    Typically it is mid June but I haven't seen a schedule for this cycle.
  17. To add to Don's list, it also applies to x.25(A)...

    To add to Don's list, it also applies to x.25(A) in Articles 505 and 506 for Zone classified locations. It even applies to "unclassified" wiring methods where Article 504 is used. See Section 504.60....
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    1$$
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    294

    I am assuming you mean "seals" where you...

    I am assuming you mean "seals" where you mentioned "explosionproof fittings". See Section 514.8. I'm unfamiliar with the Washington State Amendments, but I suspect this particular Section is...
  19. Thread: grounding

    by rbalex
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    1,181

    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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    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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    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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    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...
  23. Thread: 500.8 exception

    by rbalex
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    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 & ...
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    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). ..." ....
  25. 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...
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