Standard Interpretations
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. Each 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.
- 1910.399 - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine. - 05/13/2003
- 1910.399 - All electrical equipment must be approved. - 08/24/1993
- 1910.399 - Applicability of OSHA's LOTO standards; isolation and verification procedures. - 11/16/2000
- 1910.399 - Applicable OSHA standards and safety considerations for microwave device use in a laboratory - 08/08/2002
- 1910.399 - Application of 29 CFR 1910 Subpart S to design of industrial machinery - 12/16/2013
- 1910.399 - Certification of manufactured products intended for use in the workplace - 12/14/1994
- 1910.399 - Electrical Conductor Identification. - 12/18/1997
- 1910.399 - Electrical equipment approved by a NRTL is acceptable to OSHA. - 05/11/2004
- 1910.399 - Electrical equipment grounding requirements on concrete floors. - 11/26/2003
- 1910.399 - Electrical safety requirements for rechargeable racks for paging transmitters. - 05/12/2003
- 1910.399 - Electrical standards as it applies to desktop computers. - 02/18/1992
- 1910.399 - Grounding requirements with respect to a battery charger used with rechargeable power tools. - 03/12/1996
- 1910.399 - Nationally recognized testing laboratories evaluate safety features of electrical devices. - 07/16/1985
- 1910.399 - NRTL requirements for shielding gas regulators. - 04/24/2012
- 1910.399 - Repair/Rebuilding of UL Listed Equipment for Hazardous Locations. - 07/05/1990
- 1910.399 - Testing equipment for use in potentially hazardous environments. - 10/29/1986
- 1910.399 - The listing requirements in the U.S. for Industrial Packaging equipment. - 02/28/1990
- 1910.399 - The use of Maxon-CS-0520-HD VHF transceivers. - 10/08/1991
- 1910.399 - Use of personal cooling fans listed for "residential use only" in an industrial setting. - 02/01/2005
- 1910.399 - Use of portable vacuum cleaners for cleaning up aluminum and wood dust. - 08/22/2003
- 1910.399 - Variance request. - 06/07/1995