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Type: Posts; User: anbm

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  1. Replies
    2$$
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    98

    max. service disconnects after tap can

    23360

    See attach picture, a retail building with several tenants are powered from main wireway via utility furnished tap can, I thought NEC limits to max. 6 disconnect switches per service after...
  2. 3-phase and single-phase motor interlock control wiring diagram

    Does anyone have a wiring control diagram to show 3-phase (480V) motor to interlock with single phase (120V) motor? I.e. if the 3-phase motor runs, the single phase motor will run.
    Assuming both...
  3. 3-phase and single-phase motor interlock control wiring diagram

    Does anyone have a wiring control diagram to show 3-phase (480V) motor to interlock with single phase (120V) motor. I.e. if the 3-phase motor runs, the single phase motor will run.
    Assuming both...
  4. fire riser and electrical panel share same room?

    Can electrical panels and main service panel be installed in the same room with fire riser? (this is commercial office building)
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    5$$
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    611

    Main electrical room

    In warehouse bldg. and industrial space, I assume a main electrical room won't be needed, the panels, xfmrs can be installed along the wall as long as all clearances per NEC are met?

    What is the...
  6. Thread: AC vs. MC cable

    by anbm
    Replies
    5$$
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    483

    AC vs. MC cable

    Contractor usually use MC cable for branch circuit runs in commercial bldg. If AC cable is listed as a grounding conductor while MC cable is not, why not using AC cable?
    Is it because of MC cable...
  7. Thread: 110.16(B)

    by anbm
    Replies
    0$$
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    327

    110.16(B)

    110.16(B) is very much required an arc flash calculation for service rated 1,200A or larger before an appropriate label can glue on the gear cover. So, if a building has main service @ 1,200A or...
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    1$$
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    380

    MC cable installation

    Can MC cable be used for emergency generator circuits in non-healthcare facilities?
  9. Replies
    1$$
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    312

    240.86 Series Rating Clarification

    If panel B is fed out of panel A via a 100A/3P breaker. Panel B has several 20A/1P breakers.
    Will this rule apply between 100A /3P breaker in panel A and 20A/1 breakers in panel B?

    Or this rule...
  10. Replies
    4$$
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    549

    Legally required or optional standby generator?

    Hospital has (2) generators (they are not in parallel):

    Generator #1 feeds Critical ATS and Life-Safety ATS.
    Per NEC, Generator #1 is an emergency generator.

    Generator #2 feeds the 3rd ATS....
  11. Replies
    7$$
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    569

    Transfomer secondary tap rule

    Two fused disconnect switches are fed out of a 75kVA, 3-PH, 480 pri. 208/120V sec. xfmr (I guess this is a tap rule?).
    Each disconnect then feeds its own elec. panel. Will these two fused...
  12. NFPA-110 3.3.3* Emergency Power Supply (EPS)....

    NFPA-110

    3.3.3* Emergency Power Supply (EPS). The source of electric power of the required capacity and quality for an emergency power supply system (EPSS).

    3.3.4* Emergency Power Supply System...
  13. Normal power electrical room is built inside emergency generator room

    NFPA 110 requires emergency generator room have 2-hour fire rated wall and no other equipment can be installed in this room except emergency system distribution equipment.

    Can a separate / small...
  14. Replies
    1$$
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    365

    230.95(B) Clarification

    230.95(B) Fuses. If a switch and fuse combination is used, the fuses
    employed shall be capable of interrupting any current higher
    than the interrupting capacity of the switch during a time that...
  15. Probably not.

    Probably not.
  16. Indoor generator installation - generator room layout

    Does anyone know any guides telling us how far the engine mounted radiator needs to be away from the wall across it?
    Can radiator faces the wall or it needs to duct through wall?

    And what is...
  17. 250.24(A)(2) Outdoor Transformer - Grounding question

    250.24(A)(2) Outdoor Transformer. Where the transformer supplying the service is located outside the building, at least one additional grounding connection
    shall be made from the grounded service...
  18. Replies
    6$$
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    1,074

    No money to buy another book :happysad:

    No money to buy another book :happysad:
  19. Replies
    6$$
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    1,074

    Thank you, any thoughts for 250.194 (A)? will #6...

    Thank you, any thoughts for 250.194 (A)? will #6 copper wire be adequate for this bonding?
  20. Replies
    6$$
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    1,074

    Grounding electrode conductor size requirement

    Can anyone suggest what size of grounding electrode conductor
    we can use to bond things listed under these three sections?:?

    250.104(B) & (D)

    250.194 (A)
  21. Replies
    11$$
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    2,650

    Are you talking about constant current drivers?

    Are you talking about constant current drivers?
  22. Replies
    11$$
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    2,650

    Yes

    Yes
  23. Replies
    11$$
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    2,650

    Parking lot, site lighting voltage drop requirement

    Do we need to limit 3% voltage drop for exterior parking lot and site lighting even if they are LED lights?
    Is this a code requirement? This will make a huge cost difference.
  24. Replies
    13$$
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    858

    The breaker in my question belongs to...

    The breaker in my question belongs to 695.4(B)(3)(b)
  25. Replies
    13$$
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    858

    Got it, if fp ats is fed from a dedicated...

    Got it, if fp ats is fed from a dedicated enclosed
    breaker (seperate from emergency dist panel) downstream of generator’s main cb, are
    these two breakers need to be coordinated? Which section
    of...
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