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210.6 Branch-Circuit Voltage Limitations
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In dwelling units and guest rooms or guest suites of hotels, motels, and similar occupancies, the voltage shall not exceed 120 volts, nominal, between conductors that supply the terminals of the following:
- Cord-and-plug-connected loads 1440 volt-amperes, nominal, or less or less than 1/4 hp
Circuits not exceeding 120 volts, nominal, between conductors shall be permitted to supply the following:
Circuits exceeding 120 volts, nominal, between conductors but not exceeding 277 volts, nominal, to ground shall be permitted to supply cord-and-plug-connected or permanently connected utilization equipment, or the following types of listed luminaires:
- Electric-discharge luminaires with integral ballasts
- LED luminaires with LED drivers between the branch circuit and the lampholders
- Incandescent or LED luminaires, equipped with mediumbase or smaller screw shell lampholders, where the lampholders are supplied at 120 volts or less from the output of a stepdown autotransformer, LED driver, or other type of power supply that is an integral component of the luminaire
- Luminaires equipped with mogul-base screw shell lampholders
- Luminaires equipped with lampholders, other than the screw shell type, when used within their voltage ratings of their lampholders
- Luminaires without lampholders
- Auxiliary equipment of electric-discharge or LED-type lamps
- Luminaires converted with listed retrofit kits incorporating integral LED light sources or accepting LED lamps that also conforms with 210.6(C)(1), (C)(2), (C)(3), (C)(4), or (C)(5)
Circuits exceeding 277 volts, nominal, to ground and not exceeding 600 volts, nominal, between conductors shall be permitted to supply the following:
- The auxiliary equipment of electric-discharge lamps mounted in permanently installed luminaires where the luminaires are mounted in accordance with one of the following:
- Not less than a height of 6.7 m (22 ft) on poles or similar structures for the illumination of outdoor areas such as highways, roads, bridges, athletic fields, or parking lots
- Not less than a height of 5.5 m (18 ft) on other structures such as tunnels
- Cord-and-plug-connected or permanently connected utilization equipment other than luminaires
- Luminaires powered from direct-current systems where either of the following apply:
Exception No. 2 to (B), (C), and (D): For railway properties as described in 110.19.
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