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Conductors that are used under higher voltage conditions require thicker insulation compared to those used under lower voltage conditions. This is because the insulation must be capable of withstanding the electrical stress without breaking down. Higher voltages can more easily overcome the dielectric strength of insulation materials, making thicker insulation necessary to prevent current leakage or electrical arcs.
Answer: a
Explanation: Maximum voltage stress and mechanical stress is necessary to determine the size of insulation. Thus, if two electrical machines operate at the same voltage, large-sized conductors will need thicker insulation.