TRACT LIGHTING

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s1msgroup

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QUESTION: TRACT LIGHTING USED FOR GENERAL/RETAIL LIGHTING - SIZING FEEDER/SERVICE AND SIZING BRANCH CIRCUITS.

SEEKING CONFIRMATION OF CODE

BASED ON ART. 220.12, THE SERVICE AND FEEDER TO PANEL SUPPLYING POWER TO TRACK LIGHTING SYSTEM SHOULD BE SIZED 150va PER 2' OF TRACK.

HOWEVER, BRANCH CIRCUIT CAN BE SIZED BASED ON ACTUAL FIXTURE COUNT INSTALLED ON TRACK. (i.e. 30' OF TRACK HAS 6 - 70W SPOTS = 420W LOAD NOT 15X150VA OR 2250VA OF LOAD.) THE 2250VA WOULD BE USED FOR SIZING PANEL AND FEEDER/SERVICE. 420W WOULD BE USED FOR SIZING BRANCH CIRCUIT.

IS THIS THE CORRECT INTERPRETATION?
 
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derf48

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Re: TRACT LIGHTING

Track branch circuit is sized by 410.101 (B). The overcurrent device establishes the branch circuit rating, and in no case can it be larger than the rating of the track.

Article 220 is load calculations, and is used for sizing the service and feeder conductors, but as you have said it does not limit the length of a track in an installation.

Fred Bender
 
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