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  1. No, although the table 250.102(C) is relatively...

    No, although the table 250.102(C) is relatively new the old section 250.28(D) had the same requirements for 12.5% in the 2005 NEC. #3/0 is still the largest required GEC.
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    No your formula is incorrect. You need to find...

    No your formula is incorrect. You need to find the resistance of the heater at 240 volts and then use that with 208 volts in your calculation. Lower voltage equals lower current with a resisitive...
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    The current at 240 volts is 9000/240=37.5 amps. ...

    The current at 240 volts is 9000/240=37.5 amps. At 208 volts it will be considerably less current.
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    A Larry stated spot welding to the bus is a...

    A Larry stated spot welding to the bus is a common practice for these split bus panels and was done by the manufacturer.
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    That would be fine for using the mast to support...

    That would be fine for using the mast to support the drop.
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    Duplicate respond here:...

    Duplicate respond here:
    https://forums.mikeholt.com/showthread.php?t=199256
  7. Cables through a series of holes are static and...

    Cables through a series of holes are static and not going to move. If there is a space between them I don't see how that's not maintaining spacing. If a physical spacing device is required then the...
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    I agree, for the MBJ and GEC connections just...

    I agree, for the MBJ and GEC connections just pretend the meter disconnect does not exist and wire as you would any other service.
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    IMO it's a judgement call depending on how the...

    IMO it's a judgement call depending on how the section above the coupling is supported. You could always add a guy wire to increase the mechanical strength of the mast.
  10. Yes so in this case (unless there is some...

    Yes so in this case (unless there is some adjustment factor) you end up with a 5700 amp set of secondary conductors.
  11. 12 sets of 4 conductors in each set. A,B,C,N

    12 sets of 4 conductors in each set. A,B,C,N
  12. Thread: Elevator PITS

    by infinity
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    Here's the 2014 and 2017 for comparison. 2014...

    Here's the 2014 and 2017 for comparison.

    2014 NEC:



    2017 NEC:
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    Yes. :)

    Yes. :)
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    Makes no sense to me. :?

    Makes no sense to me. :?
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    So it's not specifically prohibited and is a...

    So it's not specifically prohibited and is a judgement call as to whether or not is will likely be subject to damage.
  16. Thread: Elevator PITS

    by infinity
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    Sounds like two circuits to me: 2017 NEC:

    Sounds like two circuits to me:

    2017 NEC:
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    I don't see track lighting specifically listed as...

    I don't see track lighting specifically listed as not permitted. If the lamp is fully enclosed should the light source type even matter?
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    I tend to agree but what specific wording in the...

    I tend to agree but what specific wording in the NEC would say that?
  19. There is no maximum size but there is a minimum. ...

    There is no maximum size but there is a minimum. You would take size of the ungrounded conductor times the number of sets and then multiply by 12.5%.

    12*750 kcmil=9000 kcmil*12.5%=1125 kcmil
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    Why do would you want to do this iso-phase? Also...

    Why do would you want to do this iso-phase? Also a 90° C conductor van use it's 90° C ampacity for the derating calculation.
  21. Thread: MCB TO MLO

    by infinity
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    If I'm reading your drawing correctly there is no...

    If I'm reading your drawing correctly there is no reason to remove the existing main CB but if that is what they want and they're paying you for it then just do it. :)
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    As stated below 3-ways is one way to comply with...

    As stated below 3-ways is one way to comply with that section but it is not a requirement.





    I agree. :)
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    Track Lighting in Clothes Closet

    If the proper clearances are met is lighting track installed above the closet door with enclosed LED heads permitted in a clothes closet?
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    If everything is ahead of the service disconnects...

    If everything is ahead of the service disconnects the feeder tap rules of Article 240 do not apply since you have service entrance conductors (SEC's) not a feeder. I might be slightly confused by...
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    Who are you responding to?

    Who are you responding to?
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