Safety considerations in electrical work
One rule applies concerning safety around the electrical apparatus. If you are in the doubt about whether or not something is safe, leave it to a professional electrician. Household voltage, about 117 V but sometimes twice that, or about 234 V, is sufficient to kill you if it appears across your chest cavity. Certain devices, like automotive spark coils, can produce lethal currents even from the low voltage in a car battery.
Consult American Red Cross or your electrician concerning what kinds of circuits, procedures and devices are safe, and which kinds are not safe.