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NEC Code and Theory Flashcards

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Read the first 7 NEC Code and Theory flashcards as text

  1. NEC 500.5 defines hazardous locations. A Class I, Division 1 location is one in which ignitable concentrations of flammable gases exist under which condition?

    Answer: Under normal operating conditions, or during repair/maintenance, or due to frequent equipment breakdown

    NEC 500.5(B)(1) defines Class I, Division 1 as a location where ignitable concentrations exist under normal operations, during repair/maintenance, or due to frequent breakdown of equipment.

  2. According to NEC 600.5, signs and outline lighting must be supplied by a branch circuit rated no more than how many amperes?

    Answer: 30 amperes

    NEC 600.5(A) requires that sign and outline lighting branch circuits be rated not to exceed 20 amperes for dwelling units and 30 amperes for all other occupancies.

  3. Under NEC 422.31(B), an appliance rated over 300 volt-amperes or 1/8 horsepower must have a disconnecting means within sight OR the disconnecting means can be out of sight if it is what?

    Answer: Lockable in the open position

    NEC 422.31(B) allows the disconnecting means to be out of sight of the appliance only if it is capable of being locked in the open (off) position.

  4. NEC 695.6 requires the power supply for fire pump motors to be arranged so that failure of power to the fire pump will result in what?

    Answer: A supervised alarm signal only, not disconnection

    NEC 695.6 requires that the fire pump power supply be supervised and that loss of power causes a supervisory signal, while the pump itself must continue to operate on available power.

  5. Per NEC 310.15(B)(2)(a), ambient temperature correction factors must be applied when conductors are installed in locations where ambient temperature differs from the base temperature of the ampacity table. The base temperature for NEC Table 310.16 is:

    Answer: 30°C (86°F)

    NEC Table 310.16 ampacity values are based on a 30°C (86°F) ambient temperature, and correction factors apply for higher or lower ambient conditions.

  6. Under NEC 445.13, the minimum conductor ampacity for generator output terminals must be at least what percentage of the generator's nameplate current rating?

    Answer: 115%

    NEC 445.13 requires that conductors from generator terminals have an ampacity of not less than 115% of the nameplate current rating of the generator.

  7. NEC 800.100 requires primary protectors for communications circuits entering buildings. Where must the primary protector be located?

    Answer: As close as practicable to the point at which the cable enters the building

    NEC 800.100(A) requires primary protectors to be located as close as practicable to the point where the communications cable enters the building to limit exposure.