Insulation issues: definition; plastic sheaths;and guarding requirements.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

February 23, 1999

T. Michael Toole, Ph.D., P.E.
Director of Construction Systems
Packer Engineering, Inc.
1950 North Washington Street
P.O. Box 353
Naperville, Illinois 60566-0353

Re: 29 CFR 1926.416(a); whether plastic conduit sheathing is insulation; definition of insulation

Dear Dr. Toole:

This is in response to your letter dated May 1, 1998, to the Occupational Safety and Health Administration (OSHA) requesting clarification of the term "insulation" as used in 29 CFR 1926.416(a).

Whether employees who are verifying that an electrical system is de-energized or are turning off circuit breakers are required to use personal protective equipment

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.