Electrical extension cords should not be used except in emergency situations. If an extension cord must be used in the laboratory, these guidelines should be followed:

• The extension cord must consist of 16 gauge or larger wire and must contain a ground wire.
• It should not be fastened with staples or hung in any way that could damage the outer covering or insulation.
• The wiring should be tested for physical integrity, polarity, and continuity of grounding at the time that it is used.

An electrical extension cord cannot be used as a substitute for appropriate distribution of electrical power.