Answer:
According to the question, brackets, racks, or insulators should support conductors on the exterior surfaces of buildings. In this case, the distance between individual conductors should be at least 50 mm from each other. The correct answer is C) 50 mm.
Step-by-step explanation:
The student's question pertains to the spacing of individual conductors on the exterior surfaces of buildings. This spacing is necessary to prevent arcing and other electrical hazards. The multiple-choice options provided (3.0 m, 150 mm, 50 mm, and 4.5 m) seem to relate to safety standards for electrical installations.
In this case, the distance between individual conductors should be at least 50 mm from each other. The correct answer is C) 50 mm.