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  1. Replies
    7$$
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    132

    Good catch. I mean accepted before formal NEC...

    Good catch. I mean accepted before formal NEC 2017 adoption since NEMA/ISA/UL will be making the Standards revisions long before any jurisdiction adopts the NEC 2017. The proposed revisions to...
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    7$$
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    132

    Type 3R may be a problem; installed correctly or...

    Type 3R may be a problem; installed correctly or not. It isn't necessarily dusttight. Typically, "handy boxes" are only Type 1 and are not certified for outdoor use.

    You can have your Union run...
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    7$$
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    132

    Without full details, a few random thoughts: ...

    Without full details, a few random thoughts:



    "...[T]he whole plant is covered with a thick layer of coal dust..." is reason for concern but unless there's no intent to clean it up I wouldn't...
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    9$$
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    148

    I basically endorse steve66's Post 9...

    I basically endorse steve66's Post 9. For it not being an "area of expertise", GoldDigger also did a respectable job based only on the text offered.

    As is often the case, the "key" is reading a...
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    3$$
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    No; it says a seal (one) within 10' of the point...

    No; it says a seal (one) within 10' of the point of emergence is needed.
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    Unless dispensing is included [Section 511.3(B)]...

    Unless dispensing is included [Section 511.3(B)] Article 511 does not automatically require belowgrade locations to be classified. Other Articles 513 to 516 may require belowgrade to be treated as if...
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    3$$
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    No; the one above grade is sufficient.

    No; the one above grade is sufficient.
  8. Welcome to the forums. The NEC Tables (charts)...

    Welcome to the forums.

    The NEC Tables (charts) T430.247 to T430.250 are based on the FLA of the worst motor any NEMA manufacturer makes. This is so motors of the same horsepower and frame size are...
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    24$$
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    Per the definition in Section 420.2 a VFD...

    Per the definition in Section 420.2 a VFD (actually an ASD, Art 430, Part X) is a controller. Technically, a hard contactor or switch isn't necessary; it only has to make or break the motor current....
  10. Thread: Area class

    by rbalex
    Replies
    1$$
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    175

    This is easier to explain from the 2011 and...

    This is easier to explain from the 2011 and earlier NECs. See Section 501.15(E)(3).

    With the 2014 NEC you have to carefully parse both Sections 501.15(E)(1) and (3).

    The UL White Book will tell...
  11. Thread: Tank Mixer Area

    by rbalex
    Replies
    19$$
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    I sincerely appreciate you coming to my defense...

    I sincerely appreciate you coming to my defense but he's right and I equally sincerely apologize to him. I originally attempted to place both versions in single post but couldn't figure out how at...
  12. Thread: Tank Mixer Area

    by rbalex
    Replies
    19$$
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    629

    Sure. I'm sorry it wasn't clear. I didn't change...

    Sure. I'm sorry it wasn't clear. I didn't change your content. But what was originally there was:




    "
    So you are looking at a 120D x 40H tank. 60hp mixer, with the shaft extending 35' into...
  13. Thread: Tank Mixer Area

    by rbalex
    Replies
    19$$
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    629

    Except for specific applications of Articles 511...

    Except for specific applications of Articles 511 to 516 and a few other standards, such as NFPA 820, classification is primarily an educated judgment. The essential concept though is classification...
  14. Thread: Tank Mixer Area

    by rbalex
    Replies
    19$$
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    629

    There may still be other nonrelated...

    There may still be other nonrelated instrumentation (or equipment) in the envelope. Though as I mentioned earlier, it probably won't make much difference to the overall installation. Many Division 2...
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    16$$
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    517

    This is an example why, "This Code is not...

    This is an example why, "This Code is not intended as a design specification or an instruction manual for untrained persons." [Section 90.1(A) -2014 NEC] This is especially true for...
  16. Thread: Tank Mixer Area

    by rbalex
    Replies
    19$$
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    629

    I suspect it is because the mixer can be pulled...

    I suspect it is because the mixer can be pulled while the overall system is still operational. Assuming the mixer is single-phase, other than a few seals, it probably won't make a significant...
  17. Thread: Tank Mixer Area

    by rbalex
    Replies
    19$$
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    629

    Actually API 500 is API Recommended Practice 500....

    Actually API 500 is API Recommended Practice 500. From the opening statement in Section 1.1.1: "... This publication is only a guide and requires the application of sound engineering judgment."NFPA...
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    9$$
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    435

    From Post 2 you mentioned, "This portable machine...

    From Post 2 you mentioned, "This portable machine is not 'one of a kind' built for this one application." This is important information assuming the entire assembly is listed as mentioned by iceworm...
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    3$$
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    274

    Good catch. In that case, identified in Section...

    Good catch. In that case, identified in Section 502.5 is met by dustight in Section 502.10(B)(4).
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    3$$
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    274

    Not unless they are also specifically identified...

    Not unless they are also specifically identified for Class II. See Section 502.5.

    It's possible you mean can Class I, Division 1 items be used in a Class I, Division 2? Then it's yes, but you...
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    9$$
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    435

    This is a tough one without actually seeing the...

    This is a tough one without actually seeing the label. I like hearing there's a Class I label but I'd like to see more specifics, such as Divisions and T-codes.

    A mechanical rather than magnetic...
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    2$$
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    271

    I'll generally endorse nhee2's response with a...

    I'll generally endorse nhee2's response with a few caveats assuming this is still a Canadian installation; i.e., the NEC is not actually the appropriate application standard. The CEC will first...
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    3$$
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    317

    petersonra made a good summary. To make a few...

    petersonra made a good summary. To make a few slightly speculative comments definite:


    Sand is not a recognized encapsulation medium under either the NEC or the CEC.
    Brushless, electronically...
  24. Without dispensing, the OP isn't in the scope of...

    Without dispensing, the OP isn't in the scope of Article 514; however it is within the scope of Article 515 which has its own rules for wiring and equipment above classified locations. [Section...
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    3$$
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    380

    Good question. What I'm about to say only applies...

    Good question. What I'm about to say only applies to motors. (As I mentioned, there are other subtle differences for other classes of equipment)

    The NEC does not require ordinary location (general...
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