Based upon an OSHA interpretation of 1910.305 dated 06/11/1993, the use of
power strips may be acceptable under some circumstances, and not acceptable
for others. The interpretation reads that "power strips (...) are generally
referred to as temporary power taps. (...) If the temporary power taps are
being used to provide transient voltage surge suppression, then these
devices would meet the OSHA standards. If the temporary power taps are
being used solely as wiring to provide extra or more convenient outlets,
then this is a violation of 29 CFR 1910.305(g)(1)(iii)(A): ...flexible cords
and cables may not be used: (A) as a substitute for the fixed wiring of a
structure". I believe this would also be a violation of the NEC.
We generally allow the use of power strips (not daisy-chained!) to support
computers and related office type equipment. If an area is using power
strips solely because the space is underpowered, our standing recommendation
is that they have additional outlets installed.
Allowing the daisy-chaining of multi-plug power strips substantially
increases the risk that the circuit will be overloaded and/or that a fault
or overheating of the circuit will occur (remember that connections within
premises wiring are made tight to limit resistance/heating, while
plug-connections are not tight, increasing resistance and generation of
heat). I also agree with the comment made that the device must be used in
accordance with the manufacturers instructions.
See also 1910.305 (a)(2)(I) and (iii) and NEC Article 305, Requirements for
temporary wiring: Temporary wiring may only be used for renovation,
remodeling, maintenance, repair or demolition and for a period not exceeding
90 days; and, branch circuits shall originate in an approved power outlet,
panelboard ... or receptacle outlet (1910.305(g) on flexible cords), which
would restrict 'daisy-chaining'.
I think the problems expressed by members of the list related to the abuse
of multi-plug strips emphasizes the need to control/limit the use of these
to what is approved and appropriate. And, I know it's a problem, because we
fight it every day!
Regards,
Zack
=======================================================
Zack Adams, PE, CSP
Occupational Safety Programs Manager
Co-Director, Environmental Health and Safety Services
Virginia Tech
Phone: (540) 231-5985 Fax: (540) 231-3944
http://www.ehss.vt.edu
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