Summarize:

Keep a fire extinguisher ready to go in areas where you work with electrical equipment. Fire extinguishers for use on electrical fires will have a "C," "BC," or "ABC" on the label. No matter how many precautions are in place, electric shock is always a risk when electricity is in use. If shock occurs, it is important to be prepared in order to handle the situation safely. In the case of an electric emergency, always call the Emergency Services. It is unwise to try to treat the victim yourself when an electrical shock has occurred. Shock victims usually don't hold the electricity in their bodies for very long. However, you must always use caution, as the victim could potentially still be conducting electricity. Use a non-conductive barrier, like rubber gloves, if at all possible, to touch or move the victim. If you can do so without being shocked yourself, turn off the power. If this is not possible, move the victim away from the source with a non-conductive material, like a piece of wood. You should only try to move an electrical shock victim if the person is in immediate danger. Once you are certain the victim is no longer conducting electricity, check to see if the person is breathing. If the victim is not breathing, begin CPR immediately while someone else alerts emergency medical services. OSHA's safety rules for working around electricity state that you have about 4 minutes to get help for an electric shock victim, so move quickly. Stay calm and keep the victim lying horizontally, with his legs slightly elevated until medical help can arrive. Once help arrives, stay out of the paramedics' way. If the paramedics ask for any assistance, follow their instructions.
Keep a fire extinguisher handy. Prepare for the worst. Call for help. Do not touch a victim of shock with bare hands. Turn off the power source, if possible. Check for vitals. Wait for medical help to arrive.