Electrical Busway Hot Swappable Plug-In Units

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 25, 2025

John D. Smart
Bell Nunnally Attorneys & Counselors
3232 Mckinney Avenue, Suite 1400
Dallas, TX 75204

Dear John D. Smart:

Acceptability of using a light switch as a disconnecting means for the electrical lockout/tagout standard.

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.

October 27, 2005

Mr. Carl Morgan
Los Alamos National Laboratory
P.O. Box 698
Los Alamos, NM 87544

Dear Mr. Morgan:

Clarification about 29 CFR 1910.333 and 29 CFR 1910.147 as they relate to work inside an electrical panel and on related 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.

July 28, 2006

Mr. Rick Kante
Safety Director
Briggs & Stratton Corporation
P.O. Box 702
Milwaukee, WI 53201

Dear Mr. Kante: