Correct C. 15Explanation

Based on the information provided in the question, the NEC does not have a specific rule that refers to the maximum number of single or two-lamp type auxiliaries on a 15-ampere branch circuit.However, there are general guidelines and considerations for branch circuit sizing and lighting load calculations in the NEC.

NEC Article 210.19(A)(3) - Branch circuits supplying lighting units and appliances shall not have more than 80% of their rated current capacity used. NEC Article 410.31 - Fluorescent lighting fixtures shall be connected in accordance with the manufacturers' instructions.Considering these general principles, a circuit rated at 15 amps would have a maximum allowable load of 80% * 15 amps = 12 amps. Each auxiliary circuit may draw approximately 0.8 amps (1 lamp) or 1.6 amps (2 lamps).Therefore, the maximum number of auxiliaries that can be placed on a single 15-amp branch circuit is:12 amps / 0.8 amps = 15 single-lamp auxiliaries12 amps / 1.6 amps = 7.5 two-lamp auxiliaries (rounded up to 8)Since both single-lamp and two-lamp auxiliaries can be used on the same circuit, the total number of auxiliaries is:15 single-lamp auxiliaries + 8 two-lamp auxiliaries = 15 total auxiliaries Flag for review