Search:

Type: Posts; User: Ranger86

Page 1 of 3 1 2 3

Search: Search took 0.01 seconds.

  1. Replies
    5$$
    Views
    1,276

    It turns out that this building falls under...

    It turns out that this building falls under "warehousing" and in NFPA 30 table 7.3.3, the classification is "ordinary" or non-classified. Also in NFPA 30, section 9.12.1 applies to this building,...
  2. Replies
    5$$
    Views
    1,276

    OK, thanks, that is what I was leaning too, but...

    OK, thanks, that is what I was leaning too, but had to hear it from another colleague. The informational note mentions that the quantity of material is a factor in the determination, which helps in...
  3. Replies
    5$$
    Views
    1,276

    NEC article 500

    This is going to sound like a dumb question .... hehe...
    If a structure that does not have power (no service) is used as a storage facility for flammable liquids (class I liquids). The liquids will...
  4. Thank you, I appreciate your help dkidd !!!

    Thank you, I appreciate your help dkidd !!!
  5. 480V Delta, 3-phase, 3-wire (ungrounded) service

    A building built in the 60's, has a 480V delta, 3phase, 3wire, ungrounded service and a 120/208V, 3ph, 4wire grounded service.

    Can somebody tell me what year the ground detection sensing...
  6. Replies
    3$$
    Views
    936

    Thanks.

    Thanks.
  7. Replies
    3$$
    Views
    936

    I think I found the answer to question #1. ...

    I think I found the answer to question #1.
    See NEC 210.19 (A)(4) exception No. 1, (d). "Tap conductors shall have an ampacity sufficient for the load served. In addition, they shall have an...
  8. Replies
    3$$
    Views
    936

    Infrared heaters

    3-pole, 50A branch circuit feeds a group of 480V single phase infrared heaters. No neutral conductors.

    #1. Can the whips to each heater be downsized to #12 AWG with no overcurrent protection at...
  9. Replies
    19$$
    Views
    7,759

    Yep, I agree with you 100% ... Thanks.

    Yep, I agree with you 100% ... Thanks.
  10. Replies
    19$$
    Views
    7,759

    I am still waiting for nameplate data...

    I am still waiting for nameplate data verification of the heaters to run a calc. The weird thing is that the main breaker did not trip if it was an over load. The feeder and branch conductors are...
  11. Replies
    19$$
    Views
    7,759

    Yes, there is definitely something fishy going...

    Yes, there is definitely something fishy going on. The main breaker partially melted on the old panel but I don't know exactly what the problem was because I was not involved on the investigation...
  12. Replies
    19$$
    Views
    7,759

    Thank you everyone for your comments. I am just...

    Thank you everyone for your comments. I am just trying to go over all opposites that could of caused this to happen. Thanks again.
  13. Replies
    19$$
    Views
    7,759

    The 3 poles have current flow. Each pole is...

    The 3 poles have current flow. Each pole is different current in most cases. In some cases there may be 2 poles with same current and the third pole with different.
  14. Replies
    19$$
    Views
    7,759

    All 3-poles are used. My question is having...

    All 3-poles are used. My question is having the unbalanced (phase currents not equal) load on each breaker , and no neutral branch circuit conductor.
  15. Replies
    19$$
    Views
    7,759

    I think there is a code violation here but I...

    I think there is a code violation here but I don't see to get a code section to back this up ....

    The 3-pole breaker is feeding a group of single phase heaters. Each heater would normally fed by...
  16. Replies
    19$$
    Views
    7,759

    I am waiting for name plate ratings from the...

    I am waiting for name plate ratings from the field to do a load calculation.
  17. Replies
    19$$
    Views
    7,759

    It is a new panel and new breakers.

    It is a new panel and new breakers.
  18. Replies
    19$$
    Views
    7,759

    Actually, the original panel that was about 30-40...

    Actually, the original panel that was about 30-40 years old, burnt up. They thought that it failed because of it's age. Then they replaced it with a new one of same characteristics, and this one...
  19. Replies
    19$$
    Views
    7,759

    Panel bus bar melted

    400A panel, 480V, 3phase (no neutral), fed from 480/277V system but neutral not brought to panel.
    The panel feeds 480V, single phase infrared heaters. This is an old building, they used 3-pole...
  20. Replies
    4$$
    Views
    1,858

    Thanks for your help.

    Thanks for your help.
  21. Replies
    4$$
    Views
    1,858

    4.8.10 talks about strike termination devices. ...

    4.8.10 talks about strike termination devices. It is not clear to me if section 4.8.10.3 applied only if it is not located in a zone of protection. So basically, what you are referring to (I...
  22. Replies
    4$$
    Views
    1,858

    Roof Top Unit - under Zone of Protection

    NFPA 780 (2011 edition), section 4.8.10.3 reads, " at least 2 main-size conductors shall be installed to connect the unit to the lightning protection system ". If the RTU is under a zone of...
  23. So, to summarize the forum responses, the EGC...

    So, to summarize the forum responses, the EGC inside the mc cable needs to be size according the T250.122. It makes no difference if the mc cable armor is listed to be used in combination with the...
  24. Here's where my confusion started ..... RMC, IMC,...

    Here's where my confusion started ..... RMC, IMC, EMT can be used as equipment ground conductors per 250.118 (2), (3), and (4). So, the way I see this, if I have a feeder that would require a #2...
  25. The Listings of the mc cable.

    The Listings of the mc cable.
Results 1 to 25 of 68
Page 1 of 3 1 2 3