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Type: Posts; User: rbalex

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  1. Replies
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    You have a rather arcane application and I...

    You have a rather arcane application and I confess, I was inclined to say "Trust me and don't worry about it." However, after reviewing the cut-sheet link I am concerned about how the Division 2...
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    11$$
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    Not usually; but specifying engineers should get...

    Not usually; but specifying engineers should get it right.
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    Read Section 500.8(C)(2) and its FPN/IN...

    Read Section 500.8(C)(2) and its FPN/IN carefully.

    With regard to the pump motor only, in Division 2, the Group is irrelevant. [See Section 501.125(B)] For other ancillary pump equipment, the...
  4. Thread: MC Cable

    by rbalex
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    505

    All Type MC-HL is rated for Class I, Division 1. ...

    All Type MC-HL is rated for Class I, Division 1. NOT all Type MC is MC-HL though; it is a very specific construction.
  5. Thread: MC Cable

    by rbalex
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    505

    Class I, Division 1 wiring methods are not...

    Class I, Division 1 wiring methods are not limited to RMC or IMC.
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    Simply using CGDS is tacit recognition the...

    Simply using CGDS is tacit recognition the location is at least Class I, Division 2. Otherwise, why do you have detection if you don't believe the presence of gas/vapor is a reasonable possibility.
    ...
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    Combustible Gas Detection System. (CGDS) [Section...

    Combustible Gas Detection System. (CGDS) [Section 500.7(K)] is a protection technique, it does not alter the classification. In fact, if you will read Subparts (1), (2), or (3) carefully, they simply...
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    Jet A-1 is essentially a diesel type fuel. It...

    Jet A-1 is essentially a diesel type fuel. It often would not be the basis for classification at all. If it had a Group at all, it would be "D".
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    There is no such thing as Class II, Division 2,...

    There is no such thing as Class II, Division 2, Group E. See Section 500.5 (C)(1)(3).
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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.
  11. 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...
  12. 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.
  13. 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...
  14. 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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    8$$
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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...
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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.
  22. 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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    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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    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.
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