What is a good way to guard against electrical shock at your station?

Each of the measures listed contributes significantly to enhancing safety and guarding against electrical shock, making the collective choice the most comprehensive approach.

Using three-wire cords and plugs for all AC powered equipment provides extra protection by ensuring that there is a grounding pathway. This third wire helps to divert any fault current away from users, reducing the risk of electrical shock.

Connecting all AC powered station equipment to a common safety ground is crucial for safety. It ensures that in the event of a fault, the current has a safe path to ground, preventing any chance of the equipment casing becoming energized, which could lead to electric shock.

Installing mechanical interlocks in high-voltage circuits adds another layer of safety, preventing simultaneous contact with higher voltage components and ensuring that the circuit can only be accessed when it is safe to do so.

Since each of these options provides an effective means of reducing the risk of electrical shock in a station environment, selecting the option stating that all these choices are correct encapsulates the best practices in electrical safety.