Search:

Type: Posts; User: rbalex

Page 1 of 8 1 2 3 4

Search: Search took 0.55 seconds; generated 10 minute(s) ago.

  1. Replies
    1$$
    Views
    51

    I haven't worked under the Canadian Electrical...

    I haven't worked under the Canadian Electrical Code (CEC) since the late '90s. That said, a boundary seal would be necessary under the NEC whether Division or Zone classified. Under CEC Zone rules at...
  2. Zooming in on the setup, it appears there's no...

    Zooming in on the setup, it appears there's no direct raceway connection between the receptacle and speaker.
  3. Replies
    7$$
    Views
    187

    The question is whether the machine/motors can be...

    The question is whether the machine/motors can be worked on safely under administrative controls. The OP gave the impression it was an integrated machine, so it may be beyond the immediate scope of...
  4. No; with 15 or more coats it probably meets a...

    No; with 15 or more coats it probably meets a Section 500.7(J) Protection Technique. Just kidding.

    What makes you think it would need to be explosionproof? See Figure 514.3; it appears to be out...
  5. Replies
    7$$
    Views
    187

    It is conceivable that their installation meets a...

    It is conceivable that their installation meets a combination of [NEC 2008] Section 430.102 (A) Exception no. 2 and 430.102 (B) Exception to (1) and (2) (b); however, depending on horsepower size(s),...
  6. Replies
    177$$
    Views
    4,380

    I don't usually care for Wikipedia as an...

    I don't usually care for Wikipedia as an authoritative source unless I can also determine its original source. Since it cites the BIPM as the source for defining watt, it would seem to be ok.

    A...
  7. Replies
    2$$
    Views
    152

    Typically, each manufacturer can supply an...

    Typically, each manufacturer can supply an estimate of sealing fiber and compound per seal fitting since they must be listed together [See 501.15(C)(1)]. For example. (See second page)

    Ductseal is...
  8. Replies
    177$$
    Views
    4,380

    Yes thanks. I have that in my "favorites" list...

    Yes thanks. I have that in my "favorites" list too; it's just the list is alphabetical and "BIPM" comes before "NIST". Of course, both are fully authoritative for the terms under discussion.
  9. Replies
    177$$
    Views
    4,380

    If you want to cite something authoritative about...

    If you want to cite something authoritative about SI units you should probably go to the source: The Bureau International des Poids et Mesures (International Bureau of Weights and Measures).
    ...
  10. Replies
    15$$
    Views
    615

    So - how would 5 ohms to ground change anything?...

    So - how would 5 ohms to ground change anything? Again, it sounds like someone is thinking, "Since 25 ohms to ground is good, 5 must be better." with no actual basis for it. There's actually no basis...
  11. I agree with Smart$. The various EPM-4C diagrams...

    I agree with Smart$. The various EPM-4C diagrams indicate it only has a "dry-contact" output. There is no internal power to the hooter indicated.
  12. A lot will depend on how is the "... flammable...

    A lot will depend on how is the "... flammable liquid near ..." is contained and/or controlled; but, for the most part, if it is a typical garage (major or minor) the classification can just follow...
  13. Replies
    15$$
    Views
    615

    I concur with this. On what basis was it...

    I concur with this. On what basis was it determined that 5 ohms was necessary or, more importantly, adequate?

    Several issues beyond the testing procedure of the grounding electrode system (GES)...
  14. Replies
    5$$
    Views
    245

    All NFPA Standards...

    All NFPA Standards are available online for the "price" of a free registration. They are a PITA to use but they are free.

    NFPA 820 has a comprehensive set of Tables similar to T514.3(B)(2) in the...
  15. Replies
    5$$
    Views
    245

    NFPA 820, Standard for Fire Protection in...

    NFPA 820, Standard for Fire Protection in Wastewater Treatment and Collection Facilities [See Section 500.4(B) FPN/IN No. 2] is the basic standard for classifying.

    Augie is spot on, "venting"...
  16. Thread: supply fan

    by rbalex
    Replies
    5$$
    Views
    343

    It isn't entirely nitpicking. Typically, an...

    It isn't entirely nitpicking. Typically, an explosionproof motor has a factory seal between the motor housing and the motor terminal box. Thus Section 501.15(B)(2) Ex No. 4 doesn't apply since there...
  17. A Myers hub/TMCX (or TMC) interface is no...

    A Myers hub/TMCX (or TMC) interface is no problem.

    My oversight. I should have referenced Section 501.30(A). The actual issue is bonding. The basic ST1 is fine in unclassified locations; however...
  18. Without reviewing the shop drawings, I can only...

    Without reviewing the shop drawings, I can only make a few preliminary comments:

    Myers hubs are usually fine in Division 2 but make sure they are also specifically rated as grounding devices.
    ...
  19. Replies
    1$$
    Views
    316

    I have done a little research. I admit it wasn't...

    I have done a little research. I admit it wasn't entirely comprehensive, but sufficient enough to firmly believe that such a luminaire doesn't exist - at least for now.
  20. Replies
    2$$
    Views
    358

    Not automatically; GoldDigger is correct that the...

    Not automatically; GoldDigger is correct that the materials used and test protocols will ultimately determine the internal classification.

    I would note that, if the vent hoods and the rest of the...
  21. Replies
    17$$
    Views
    758

    In addition to my previous post, note the...

    In addition to my previous post, note the etymology; especially '-cute'.
  22. Replies
    17$$
    Views
    758

    I guess it depends on the dictionary...

    I guess it depends on the dictionary. This particular online Merriam-Webster dictionary has the same content as NFPA's "official" Manual of Style reference: Webster’s Collegiate Dictionary, 11th...
  23. Replies
    49$$
    Views
    2,343

    It's certainly a reasonable inference. Several...

    It's certainly a reasonable inference. Several manufactures have both listed and unlisted products. Simply finding their name in the Online Certification Directory doesn't necessarily mean all their...
  24. "Think about it, spark producing devices are only...

    "Think about it, spark producing devices are only allowed to exist in an un classified area..." OR in an explosionproof enclosure [Section 501.15(A)(1)(1)] OR by using some other recognized...
  25. What is your basis for that? Neither the seals...

    What is your basis for that? Neither the seals nor explosionproof enclosures are gas/leak-proof. In fact, explosionproof enclosures are designed to "breath" and seals are permitted to leak.

    OK, I...
Results 1 to 25 of 200
Page 1 of 8 1 2 3 4