Question 49Electricity & Electronics - Assistant Engineer

The correct answer is D) start/stop push button station. A start/stop push button station is not considered a suitable primary means of electrical isolation, as it is not designed for that purpose. The primary means of electrical isolation should be a device that can reliably and safely disconnect the electrical circuit, such as a circuit breaker (A) or a fused/non-fused disconnect switch (B and C). These devices are specifically engineered to provide a clear physical separation of the electrical circuit, which is essential for safety and maintenance purposes. In contrast, a push button station is intended for control and operation, not for isolation, and should not be used as the primary means of cutting off power to a circuit.