Use of explosion proof certified equipment inside of pipes and manholes.

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.

September 21, 1995

The Honorable Bill McCollum
605 East Robinson Street, Suite 650
Orlando, Florida 32801

Dear Congressman McCollum:

Classification of sweepers and scrubbers.

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.

April 3, 1995

Mr. Bruce J. Borgerding
Associate General Counsel Tennant
701 North Lilac Drive
P.O. Box 1452
Minneapolis, MN 55440-1452

Dear Mr. Borgerding:

MSHA testing and approval of bearing temperature equipment manufactured by Topf Enterprises.

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.

December 29, 1988

Mr. Joseph Bode
Occupational Safety and
Health Administration
Washington, DC 20210

Dear Mr. Bode:

This letter is in response to your request for information concerning Mine Safety and Health Administration (MSHA) testing and approval of bearing temperature equipment manufactured by Topf Enterprises of Tyrone, Pennsylvania.

Grounding requirements with respect to a battery charger used with rechargeable power tools.

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.

March 12, 1996

Mr. Barron L. Stroud, Jr.
Law Offices of Miles
& Stockbridge
10 Light Street
Baltimore, MD 21202-1487

Dear Mr. Stroud:

This is in response to your April 18 letter requesting clarification regarding the grounding requirements of 29 CFR 1910.304 with respect to a battery charger used with rechargeable power tools. Please accept our apology for the delay in responding. Your question and our reply follow.

Electrical hazardous area classification drawings in the workplace.

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.

December 12, 1997

Mr. Walter Hyde
Hyde Consultants, Inc.
4106 Sherwood Lane
Houston, TX 77092

Dear Mr. Hyde:

NRTL certification for electrically-operated sewer inspection 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.

February 7, 2000

Mr. Steven M. War
c/o Mr. James Gromada
Fish & Richardson P.C.
601 Thirteenth Street, NW
Washington, D.C. 20005

Dear Mr. War:

Requirements for 'area classification drawings' for petrochemical plants.

Archive Notice - OSHA Archive

NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. It is presented here as historical content, for research and review purposes only.

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.

December 29, 1992

(Name Withheld)

Dear (Name Withheld):

Use of portable vacuum cleaners for cleaning up aluminum and wood dust.

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.

August 22, 2003

Ms. Nancy LeClerc
Safety and Environmental Coordinator
Marvin Windows & Doors
14835 Highway 17 West
Grafton, ND 58237

Dear Ms. LeClerc:

Using non-electrical equipment in locations with hazardous atmospheres.

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.

June 29, 2015

Mr. Kim G. Feddersen Vac-U-Max
69 William Street
Belleville, NJ 07109

Dear Mr. Feddersen:

Thank you for your correspondence to the Occupational Safety and Health Administration's (OSHA), Directorate of Enforcement Programs. You requested clarification from OSHA on Nationally Recognized Testing Laboratory (NRTL) approval requirements for equipment in combustible dust atmospheres.