What is the first action to take if a co-worker is suffering a shock from an electrical circuit and cannot let go of the circuit?

The first action to take when a co-worker is suffering from electric shock and is unable to release themselves from the circuit is to disconnect the power to the electrical circuit. This is crucial because the immediate priority is to eliminate the source of electrical current that is causing the shock. If the power is not turned off, any intervention made could result in further injury or even death, as you may also become a victim of the electric shock if you attempt to help while the circuit is live.

Turning off the power can usually be done through a circuit breaker or unplugging the device if it is safe to do so. Once the power is disconnected, it becomes safe to approach the individual, assess their condition, and provide necessary first aid or call for emergency medical assistance as required.

Options that suggest administering CPR or using a metal object to pull the person away could pose serious risks; administering CPR should only be done if the individual is unresponsive and not breathing after the power is turned off, and using a metal object could lead to further injury for both the victim and the rescuer. Calling emergency services is important, but it should follow after ensuring the power is disconnected, to provide a safe environment for help to be rendered.