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  1. It is confusing. It is also important to...

    It is confusing. It is also important to understand that a recognized protection technique in the NEC is not necessarily a required protection technique. We had a similar discussion here.

    NEC and...
  2. You are still constrained by Section and Table...

    You are still constrained by Section and Table 300.5. I don't see you justifying less than 24" in any case.
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    A few comments: · Unless the entire...

    A few comments:


    · Unless the entire skid mounted assembly is listed as a whole, the basic rules of the NEC apply.
    · Article 424 only applies to space heating. Article 427...
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    Don (don_resqcapt19) said there is no...

    Don (don_resqcapt19) said there is no requirement. Dennis says that, in absence of a requirement, there is none. Both are correct.

    You and your supervisor are probably operating under the...
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    This is embarrassingly interesting. I was totally...

    This is embarrassingly interesting. I was totally unaware there even was a "TC-ER-HL." I was the "father" of "-HL" and an "uncle" for"-ER". I was an original commenter for UL Standard 2225....
  6. While Don's comment is relevant, I recommend...

    While Don's comment is relevant, I recommend reading the FPN/INs to the Titles of Articles 511-516. The essence is, unless you get the base documents changed, you will have little hope getting your...
  7. This is a tough one. I've said before that...

    This is a tough one. I've said before that classification can't usually be determined from the NEC itself - except for installations subject to Articles 511 to 516. Where they apply, those Articles...
  8. One of the general distinctives between IEC and...

    One of the general distinctives between IEC and NEC is there is so such thing as "general purpose" applications in IEC classified locations. An "Increased Safety" protection technique (Type "Ex e")...
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    A few observations: The photo indicates an...

    A few observations:


    The photo indicates an outdoor application which is, by definition, a wet location. [Article 100: Location, Wet]
    Section 314.15 requires "Boxes, conduit bodies, and...
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    As several have noted in various ways, "......

    As several have noted in various ways, "... voltage has no bearing on the ampacity of bare conductors. Yet Code doesn't always agree completely with the physics."

    The definition of Ampacity in...
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    As I said, I already won this battle with a very...

    As I said, I already won this battle with a very conservative jurisdiction. But then you win some and lose some. I still think you have over-analyzed the text; nevertheless, I understand your...
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    I see you've done further homework. I appreciate...

    I see you've done further homework. I appreciate it.

    I've done battle over this issue with a jurisdiction we're both familiar with. At the time, it essentially said I couldn't design something it...
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    With regard to NEC Ampere ratings for bare...

    With regard to NEC Ampere ratings for bare conductors, see Table 310.15(B)(21)[2011 and 2014 NEC, formerly T310.21]. See the application limitations noted in the Table's title.

    "Free Air" may be...
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    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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    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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    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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    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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    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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    No; the one above grade is sufficient.

    No; the one above grade is sufficient.
  21. 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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    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....
  23. Thread: Area class

    by rbalex
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    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...
  24. Thread: Tank Mixer Area

    by rbalex
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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...
  25. Thread: Tank Mixer Area

    by rbalex
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    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...
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