APPLIANCES

70-351 except where protected from physical damage or track operating at less than 30 volts RMS open-circuit voltage. (d) Support. Fittings identified for use on lighting track shall be designed specifically for the track on which they are to be installed. They shall be securely fastened to the track, maintain polarization and grounding, and shall be designed to be suspended directly from the track. 410-102. Track Load. For branch-circuit calculations, a maximum of 2 feet (609.6 mm) of lighting track or fraction thereof shall be considered 180 VA. Where multicircuit track is installed, the load requirement of this section shall be considered to be divided equally between the circuits. Exception: Where installed in dwelling unit(s) or the guest rooms of hotels or motels. 410-103. Heavy-Duty Track. Heavy-duty lighting track is lighting track identified for use exceeding 20 amperes. Each fitting attached to a heavyduty lighting track shall have individual overcurrent protection. 410-104. Fastening. Lighting track shall be securely mounted so that each fastening will be suitable for supporting the maximum weight of fixtures that can be installed. Unless identified for supports at greater intervals, a single section 4 feet (1.22 m) or shorter in length shall have two supports, and, where installed in a continuous row, each individual section of not more than 4 feet (1.22 m) in length shall have one additional support. 410-105. Construction Requirements. (a) Construction. The housing for the lighting track system shall be of substantial construction to maintain rigidity. The conductors shall be installed within the track housing permitting insertion of a fixture, and designed to prevent tampering and accidental contact with live parts. Components of lighting track systems of different voltages shall not be interchangeable. The track conductors shall be a minimum No. 12 or equal, and shall be copper. The track system ends shall be insulated and capped. Exception: Fittings that incorporate an integral device to reduce the line voltage for a lower voltage lamp. (b) Grounding. Lighting track shall be grounded in accordance with