Search:

Type: Posts; User: mayanees

Page 1 of 8 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    28$$
    Views
    1,329

    Unfortunately NFPA 70E will not permit this,...

    Unfortunately NFPA 70E will not permit this, unless it's more dangerous to turn the panel off, in which case you have to fill out an Energized Electrical Work Permit that gets signed by a half dozen...
  2. Replies
    51$$
    Views
    2,927

    I have a letter from BG&E for a unit with 1.55 %...

    I have a letter from BG&E for a unit with 1.55 % Z.
  3. Replies
    5$$
    Views
    532

    Arc flash labelling requirements are listed in...

    Arc flash labelling requirements are listed in the NEC in 110.16 and in 70E it's 130.5(H)
  4. Replies
    1$$
    Views
    1,011

    hmmmm

    Jim,

    You likely won't get many folks to agree with you on this because there could be that one installation that exceeds 8 calories, but generally speaking I think you're pretty safe with PPE 2.
    ...
  5. Now that's funny right there :) But the fact...

    Now that's funny right there :)

    But the fact of the matter is that the POCO could be using a 7.5, with three services on it ! That's what this loadtest meter is missing; the strength of the source.
  6. Replies
    14$$
    Views
    1,165

    Thanks Augie. That's exactly what I'm looking...

    Thanks Augie.

    That's exactly what I'm looking for.
  7. Replies
    14$$
    Views
    1,165

    additional data

    I was able to get a more realistic IE level when using the Utility's reported minimum fault level of 21 calories.

    I think that if properly modeled with a limiter in each phase, one can see from...
  8. Replies
    14$$
    Views
    1,165

    Cable limiters used for IE reduction

    I'm running into the same application with parallel 350kCM conductors with a Bussman 500-amp cable limiter catalog number KCM. And just as in your situation the IE level is drastically reduced from...
  9. I don't have a code book to check this, but I...

    I don't have a code book to check this, but I believe the voltage drop limitation is at the motor terminals and not the controller. Please correct me if I'm wrong.
  10. Replies
    19$$
    Views
    1,091

    oops :) Thanks

    oops :)
    Thanks
  11. Replies
    19$$
    Views
    1,091

    That's only for existing installations though....

    That's only for existing installations though. 240.87(A)
  12. Thread: 110.24(A)

    by mayanees
    Replies
    25$$
    Views
    1,875

    110.16(B)

    How about the requirements of 110.16(B) for available fault current and upstream device opening time? John C, do you look for that? I can see 110.24(A) as using an infinite bus calculation on the...
  13. Replies
    4$$
    Views
    467

    HNB

    That breaker has magnetic-only adjustability, from 3.4 to 6.7X the trip rating. That's according to the SKM library file.
  14. Replies
    4$$
    Views
    2,331

    Arc Flash Kit Recommendations

    Please let me know of your experience and recommendations for an Arc Flash PPE kit.

    My last one was 8-calorie from Salisbury and it was coveralls-based and it's been fine for 7 years. I'm looking...
  15. Replies
    2$$
    Views
    261

    oil testing

    I think that could be arcing in the tank that's causing oxygen depletion and a corresponding vacuum.
    I recommend you have the oil tested as soon as possible.
  16. Replies
    7$$
    Views
    673

    I'd say based on SKM's models for cable that it's...

    I'd say based on SKM's models for cable that it's 120 amps if aluminum and 150 amps if copper.
  17. Replies
    20$$
    Views
    1,079

    480V, 800 Amp

    That looks like 480V, 800 Amp gear. And it also looks like the 300 kVA transformer is undersized, especially if all of the fan motors run together. Of course the Utility can easily swap it out with a...
  18. Replies
    9$$
    Views
    472

    I think the requirement for disconnects will be...

    I think the requirement for disconnects will be from NFPA 70, NEC.

    NFPA 70E, Standard for Electrical Safety in the Workplace is a National Consensus Safety Standard, and as such is in effect when...
  19. Replies
    52$$
    Views
    3,665

    Actually you do have overload protection for the...

    Actually you do have overload protection for the primary conductors, which is the secondary ocpd. Much the same way that overloads protect motor conductors at ampacity.

    But it's still clear to me...
  20. Replies
    2$$
    Views
    598

    445.12

    I would revert to 445.12 (A) which gives allowance for protection by design. Perform load calculations to assure the generator is protected from overload and that the cables meet the load...
  21. Replies
    5$$
    Views
    314

    You will probably never be able to justify with...

    You will probably never be able to justify with an EEWP doing "hot" work on that 130 calorie bus, but you may still need to verify the absence of voltage if you can't do in in some alternate fashion....
  22. Replies
    5$$
    Views
    314

    That is a common misunderstanding in the arc...

    That is a common misunderstanding in the arc flash world; the RED DANGER tags that say NO SAFE PPE EXISTS when the incident energy level exceeds 40 calories.

    I've seen 125 calorie PPE suits...
  23. Replies
    2$$
    Views
    419

    NETA MTS 2015

    I would recommend performing some form of NETA Maintenance/Acceptance Testing on the unit keeping the terminations intact. And since the unit was moved, I would include a turns ratio test.
    John M
  24. Replies
    25$$
    Views
    7,002

    Jraef, Sir, You are one 70E Code cycle off! 70E...

    Jraef, Sir, You are one 70E Code cycle off!
    70E 2018 now has Table 130.5(C) Estimate of likelihood of Occurrence of an Arc Flash incident ... and that table defines Normal with 6 conditions that...
  25. Replies
    9$$
    Views
    909

    thanks

    I think 300.15(C) applies.

    I think they're sleeves to cable tray, made up of at least some type TC cable.

    I've added the other two pics my friend sent me from the field.

    And yes it is very...
Results 1 to 25 of 200
Page 1 of 8 1 2 3 4