Use of extension cords at University of Michigan (U-M) is restricted to only providing temporary power for portable equipment (e.g., maintenance, cleaning, audio-visual, or construction activities).  If an extension cord is used, U-M policy states the extension cord must be:

• Certified by a nationally recognized laboratory (UL, CSA, ITSNA)
• Used only in continuous lengths without splice or tape

Before using an extension cord:

• Inspect it and remove it from service if it is damaged
• Verify it is suitable for the use and location of the equipment

Restrictions to Extension Cord Use

Extension cords cannot be:

• Connected in series to another cord or power strip (daisy-chain, piggy-back)
• Continually connected to an outlet for more than 1 work day
• Used with equipment drawing more than 15 amp
• Used as a substitute for fixed wiring of a structure
• Attached to building surfaces
• Concealed by walls, floors, or ceilings or located above suspended or dropped ceilings
• Installed in raceways, except when permitted by Code
• Run through:
  • Holes in walls, ceilings, or floors
  • Doorways, windows, or similar openings
• Placed where it is subject to physical damage

While a surge suppressor is a power strip, not all power strips are equipped with surge suppression.

• Power strip: A block of electrical sockets that allows multiple electrical devices to be powered from a single electrical socket.
• Surge suppressor: An appliance/device designed to protect electrical devices from voltage spikes.

Using Power Strips or Surge Suppressors

When using power strips or surge suppressors, only:

• One power strip or surge suppressor is allowed per duplex electrical outlet
• Low current devices such as radios, computers, printers, etc. are allowed to be plugged into it

NOTE: Scientific equipment must be plugged directly into the primary wall outlet.  If sensitive lab equipment requires a surge suppressor, it must be noted in the labs standard operating procedures.

Restrictions on Power Strip or Surge Suppressor Use

Power strips or surge suppressors cannot be used:

• In a series (daisy-chain, piggy-back)
• With equipment containing a heating element