277V Under Cabinet Luminaire

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Slim421

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Does the Code prohibit the installation of a 277V luminaire for under cabinet installation, for permanent connection to a dedicated branch circuit? If it is not prohibited, can the luminaire be provided with an on/off switch? If it is prohibited, reference to the appropriate clause from the Code is appreciated.
Joe
 
I cannot imagine this is a dwelling. If this is a dwelling then no you cannot have 277 volts-- art.210.6(A). If you meet the specification of (B) then you can if it is not a dwelling. I think

210.6 Branch-Circuit Voltage Limitations.
The nominal voltage of branch circuits shall not exceed the values permitted by 210.6(A) through (E).
(A) Occupancy Limitation. 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:
(1) Luminaires
(2) Cord-and-plug-connected loads 1440 volt-amperes, nominal, or less or less than ? hp
(B) 120 Volts Between Conductors. Circuits not exceeding 120 volts, nominal, between conductors shall be permitted to supply the following:
(1) The terminals of lampholders applied within their voltage ratings
(2) Auxiliary equipment of electric-discharge lamps
(3) Cord-and-plug-connected or permanently connected utilization equipment
(C) 277 Volts to Ground. Circuits exceeding 120 volts, nominal, between conductors and not exceeding 277 volts, nominal, to ground shall be permitted to supply the following:
(1) Listed electric-discharge luminaires
(2) Listed incandescent luminaires, where supplied at 120 volts or less from the output of a stepdown autotransformer that is an integral component of the luminaire and the outer shell terminal is electrically connected to a grounded conductor of the branch circuit
(3) Luminaires equipped with mogul-base screw shell lampholders
(4) Lampholders, other than the screw shell type, applied within their voltage ratings
(5) Auxiliary equipment of electric-discharge lamps
(6) Cord-and-plug-connected or permanently connected utilization equipment
Click to expand...
 
jumper said:
Dennis, I am lost on why you think this is a dwelling? OP never states dwelling. Or did i miss something?:-?
Click to expand...

The OP did not state what it was. Dwelling, commercial, industrial or chicken coop. OP did not provide all info needed to give correct answer.
 
The installation would not be considered a dwelling, it would be an office type setting where 277V supply source is available.
 
IMO, 277V undercabinet lighting is allowed (at least for commercial).

However, I don't think you will find a 277V undercabinet light with an integral rocker switch.

For some reason, I believe the manufacturers will only put rocker switches on 120V fixtures. I think it must be a requirement for getting a UL listing.

For example, Lithonia standard undercabinets only come in 120 Volts, and the "UC" fixtures have a footnote that says the rocker switch is for 120V only.

Steve
 
I believe that 277V under cabinet lighting is allowed by the Code. My concern is with an integral switch that is provided with the luminaire. Does the Code prohibit the switching of such a device? There are 277V rated switches that will work in this application. I do not believe that UL prohibits an under cabinet luminaire rated 277V from being provided with a switch...just perplexed why product manufacturer does not offer this construction. Have the requirements for "Branch-Circuit Voltage Limitations" "277 Volts to Ground" changed to allow this type of luminaire to be equipped with a switch?
 
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