Question 391Electricity & Electronics - Assistant Engineer

The correct answer is A) 10 gauge. According to 46 CFR Subchapter J, the minimum conductor size for a 25 or 30 ampere lighting branch circuit supplying a non-switched cargo-hold light fixture is 10 gauge. This is because the regulations require a minimum conductor size of 10 gauge for branch circuits rated at 25 or 30 amperes to ensure sufficient capacity and safety for the electrical load. The other options, 12 gauge (B), 14 gauge (C), and 16 gauge (D), would not be acceptable as they do not meet the minimum conductor size requirement specified in the regulations for this type of circuit.