Try to switch off or disconnect the power supply. Do not touch the person until you are sure power is turned off.
If you cannot switch off the power supply, try to remove the person without touching them directly using something that is dry and does not conduct electricity.
Begin CPR immediately once the person is removed if they are not breathing, coughing, or moving and don't have a pulse.
Do not clean any burned areas, but cover them with a sterile gauze bandage, if available, or a clean cloth.