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Type: Posts; User: Johnhall30

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  1. You can put low voltage wiring in the same...

    You can put low voltage wiring in the same condiut as power conductors as long as the low voltage wiring is rated for 600V (i.e. you could use some #14 THHN)
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    The MWBC is serving 120V loads in the dwelling so...

    The MWBC is serving 120V loads in the dwelling so they should be protected by AFCI.
  3. VA = Volts (L-L) x 1.73 x Current (3-phase...

    VA = Volts (L-L) x 1.73 x Current (3-phase only)

    FLA of each leg in a 3-phase circuit = VA / (Volts (L-L)) * 1.73)
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    The 15 and 30 denotes the Candela setting for...

    The 15 and 30 denotes the Candela setting for each device
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    Although it doesn't specifically say you have to...

    Although it doesn't specifically say you have to land the 10' tap conductors into a single set of OCPD, it seems bad practice because the tap conductors aren't fully protected from overloading.

    I...
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    Yes the wording in 240.21(B)(1) doesnt...

    Yes the wording in 240.21(B)(1) doesnt specifically state you need to terminate in a single OCPD. After more research I believe 408.36 requires make this case require a single OCPD.

    408.36...
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    Just submit an RFI and ask him to submit the...

    Just submit an RFI and ask him to submit the fault currents.
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    Meter/ Load center Tap conductors

    Can tap conductors feeding a dwelling unit meter/load center terminate into two overcurrent protection devices, or does this load center need to have a main breaker?

    Alternatively, I could upsize...
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    Gas meters must be located at least 3 feet away...

    Gas meters must be located at least 3 feet away from an electric meter or other service equipment. I would think it is safe practice to also assume that a receptacle should maintain this clearance...
  10. The harmonic distortion creates uneven currents...

    The harmonic distortion creates uneven currents in the neutral conductor, this reducing the efficiency of a balanced 3-phase system. These types of problems can lead to increased voltage drop and...
  11. Max continuous load you can put on a 20A circuit...

    Max continuous load you can put on a 20A circuit is 16A (80% x 20 = 16). 16A *120V = 1920VA, which is max continuous load allowed on a 20A circuit.

    3 lights is 1500VA, 4 lights is 2000VA. 4...
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    Good point. I did not consider the ampacity of...

    Good point. I did not consider the ampacity of #12 in MC cable to have an ampacity of 25A. However, the ampacity of #12 NM cable is limited to 20A, correct? MC cable can use the ampacity in the 75ยบ...
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    Conductor derating does not apply to MC cable? ...

    Conductor derating does not apply to MC cable?

    Table 315.10(B)(3)(a) says - "Number of conductors is the total number of conductors in the raceway or cable,"
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    Wouldn't you have to run 10/6 to the first...

    Wouldn't you have to run 10/6 to the first receptacle, because you have 6 conductors in a single raceway? You would have to de-rate the wire by 80%
  15. 12kW / 120V = 100A is the line current from one...

    12kW / 120V = 100A is the line current from one of the loads, which creates a 100A current in the neutral conductor.

    If two loads are connected, the current in the neutral conductor add together...
  16. I believe you can calculate the single-phase load...

    I believe you can calculate the single-phase load for phase B by: 200A x 208V, because the line to neutral voltage is 208, not 120, on phase B,

    This does not increase your total 3-phase load...
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    You should bring a neutral to the switch box in...

    You should bring a neutral to the switch box in case they want to add a dimmer or occupancy sensor in the future, which might require a neutral connection for the internal electronics.
    Run 12/3...
  18. Thread: E2 Exam

    by Johnhall30
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    Thanks, E1 and E2 are ICC exams E1 is...

    Thanks, E1 and E2 are ICC exams
    E1 is residential electrical inspector and E2 is commercial electrical inspector.
  19. Thread: E2 Exam

    by Johnhall30
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    E2 Exam

    I am going to study and take my E1 and E2 exam and I am confused on the "Code Year" Section.

    Am I allowed to take a test on any version of the NEC? I would assume this would be regulated by my...
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