220.43(B) Track Lighting. For track lighting in other than dwelling
units or guest rooms or guest suites of hotels or motels, an
additional load of 150 volt-amperes shall be included for every
600 mm (2 ft) of lighting track or fraction thereof. Where
multicircuit track is installed, the load shall be considered to be
divided equally between the track circuits.
Exception: If the track lighting is supplied through a device that limits
the current to the track, the load shall be permitted to be calculated
based on the rating of the device used to limit the current.