Question: 

In this motor control circuit, how would you ensure that there is no danger of electric shock prior to touching either of the motor terminals (shown as points A and B in the schematic diagram)? Describe both the action required to secure the power, and the means by which you would check for the presence of hazardous voltage at the motor:

Answer: 

Follow these steps:

1. Open the circuit breaker.
2. Lock the circuit breaker in its "open" position so no one can close it.
3. Try to start the motor by turning the On/Off switch "on".
4. Leave the On/Off switch in the "off" position.
5. Test for hazardous voltage (both AC and DC) between A and B, between A and ground, and between B and ground.