During rig up, the night electrician connected the power cables and turned on the light switches from MCC (motor control center). While walk around the electrician noticed that the light on the water tank was not on. Upon inspection he found that the cable to the water tank was not connected. He then attempted to plug the socket and turned it (Twist Switch) to switch on the power. Unfortunately he did not notice the damaged section (exposed wires) of the cable and got an electric shock on his right arm. Immediately he went to the MCC and turned off the switch. Luckily he didn’t receive any electrical burn.