Always use wires and connectors with insulated shrouds. If another person can't let go from an energized conductor, swtich the power off immediately. If that is not possible, use non conductive material to separate the body from the contact. Act swiftly but take care to protect yourself while helping the other. B. Equipment grounding Grounding is very important.
Improper grounding can be the source of errors, noise and a lot of trouble.
Here we will focus on equipment grounding as a protection against electrical shocks. Electric instruments and appliances have equipment cases that are electrically insulated from the wires that carry the power. The isolation is provided by the insulation of the wires as shown in the figure a below. However, if the wire insulation gets damaged and makes contact to the case, the case will be at the high voltage supplied by the wires. If the user touches the instrument he or she will feel the high voltage.