Always unplug them when not in use. When using power tools, be sure your equipment is adequate for the job. There must be enough circuits of the correct size and all must be well grounded. Use the safety release to prevent accidental starting. Keep tools clean, and use and store them in a dry place.
Dampness increases shock hazard.
Protect cords from heat, chemicals, gases, or oil and coil them loosely when finished. For outlets used frequently, get safety covers that let appliance cords pass in and out. Never leave light bulb sockets empty. Replace burned out lights immediately. Keep floors clear of small metal objects children may use to poke in outlets.