Standard Interpretations
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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.
- 1910.303 - "Mr. Ouch" Labeling System. - 08/10/1983
- 1910.303 - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine. - 05/13/2003
- 1910.303 - Acceptable use of the presence sensing device - 04/12/1991
- 1910.303 - Compliance requirements for relocatable power taps or "power strips" - 11/18/2002
- 1910.303 - Electrical Conductor Identification. - 12/18/1997
- 1910.303 - Electrical conductors and equipment must be approved and used according to its listing/label. - 05/27/2003
- 1910.303 - Electrical standards as it applies to desktop computers. - 02/18/1992
- 1910.303 - NRTL requirements for gas-shielded arc welding equipment. - 01/28/2011
- 1910.303 - Proper wiring of a new overhead crane. - 11/13/1991
- 1910.303 - Requirements for emergency eyewash stations in retail autoparts stores - 08/11/1994
- 1910.303 - Testing equipment for use in potentially hazardous environments. - 10/29/1986
- 1910.303 - Unapproved Plug and Socket Combination. - 01/05/1984
- 1910.303 - Use of personal cooling fans listed for "residential use only" in an industrial setting. - 02/01/2005
- 1910.303(a) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine. - 05/13/2003
- 1910.303(a) - Application of 29 CFR 1910 Subpart S to design of industrial machinery - 12/16/2013
- 1910.303(a) - Certification of Nurse Call Systems - 12/29/1989
- 1910.303(a) - Clarification of the Electrical Standard as it applies to flexible power cords on appliances. - 09/09/1997
- 1910.303(a) - Control systems used for emergency evacuation are required to be listed by Underwriter's Laboratories. - 10/15/1990
- 1910.303(a) - Electrical conductors and equipment must be approved and used according to its listing/label. - 05/27/2003
- 1910.303(a) - Electrical equipment approved by a NRTL is acceptable to OSHA. - 05/11/2004
- 1910.303(a) - NRTL certification for electrically-operated sewer inspection equipment. - 02/07/2000
- 1910.303(a) - NRTL requirements for shielding gas regulators. - 04/24/2012
- 1910.303(a) - OSHA practices in recognizing national testing laboratories. - 08/19/1982
- 1910.303(a) - Repair/Rebuilding of UL Listed Equipment for Hazardous Locations. - 07/05/1990
- 1910.303(a) - Workplace use of electrical equipment designated as "Household Use Only" and recordkeeping requirements. - 07/16/2003
- 1910.303(b) - Electrical equipment approved by a NRTL is acceptable to OSHA. - 05/11/2004
- 1910.303(b) - Workplace use of electrical equipment designated as "Household Use Only" and recordkeeping requirements. - 07/16/2003
- 1910.303(b)(1) - Approval of employee-furnished equipment for use in hazardous locations; definition of "electric utilization equipment." - 07/24/2006
- 1910.303(b)(1) - Clarification of under voltage protection on metal-working equipment and emergency stop devices. - 04/28/1999
- 1910.303(b)(1)(i) - Acceptable job-made extension cords. - 06/17/1992
- 1910.303(b)(2) - Acceptability of using a light switch as a disconnecting means for the electrical lockout/tagout standard. - 10/27/2005
- 1910.303(b)(2) - Applicable OSHA standards and safety considerations for microwave device use in a laboratory - 08/08/2002
- 1910.303(b)(2) - Compliance requirements for relocatable power taps or "power strips" - 11/18/2002
- 1910.303(b)(2) - Electrical conductors and equipment must be approved and used according to its listing/label. - 05/27/2003
- 1910.303(b)(2) - Installation and use of electrical equipment must be consistent with NRTL intructions for that equipment. - 08/26/2003
- 1910.303(b)(2) - The listing requirements in the U.S. for Industrial Packaging equipment. - 02/28/1990
- 1910.303(b)(2) - Use of personal cooling fans listed for "residential use only" in an industrial setting. - 02/01/2005
- 1910.303(b)(2) - Workplace use of electrical equipment designated as "Household Use Only" and recordkeeping requirements. - 07/16/2003
- 1910.303(e) - Acceptable job-made extension cords. - 06/17/1992
- 1910.303(g) - Guarding energized electrical parts within cable trays (H.D. Roberts Jr/DEP/GIE/Harvey/26006) - 07/01/2015
- 1910.303(g) - Guarding energized equipment at voltages below 60 volts DC. - 09/04/2015
- 1910.303(g) - Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. - 07/26/2004
- 1910.303(g)(1) - Electrical equipment grounding requirements on concrete floors. - 11/26/2003
- 1910.303(g)(1) - Safety electrical work practices; motor disconnects;work clearances. - 02/07/1996
- 1910.303(g)(1) - Update to September 26, 2002 interpretation letter regrading the guarding of live parts electrical requirements. - 07/01/2005
- 1910.303(g)(1)(i) - Access and working space requirements for electric equipment (600V or less). - 05/28/1999
- 1910.303(g)(2) - Guarding energized electrical parts within cable trays (H.D. Roberts Jr/DEP/GIE/Harvey/26006) - 07/01/2015
- 1910.303(g)(2) - Guarding energized equipment at voltages below 60 volts DC. - 09/04/2015
- 1910.303(g)(2) - Motor wiring connects. - 04/02/1996
- 1910.303(g)(2) - Update to September 26, 2002 interpretation letter regrading the guarding of live parts electrical requirements. - 07/01/2005
- 1910.303(g)(2) - Use of ANSI C2-1997 as guidance for protecting employees working near insulated shielded conductors - 09/26/2002
- 1910.303(g)(2)(i) - Guarding requirements for 50 volts or more DC. - 09/04/2015
- 1910.303(g)(2)(ii) - Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. - 07/26/2004
- 1910.303(h) - Guarding energized electrical parts within cable trays (H.D. Roberts Jr/DEP/GIE/Harvey/26006) - 07/01/2015
- 1910.303(h) - Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. - 07/26/2004
- 1910.303(h)(2) - Use of ANSI C2-1997 as guidance for protecting employees working near insulated shielded conductors - 09/26/2002
- 1910.303(h)(2)(ii) - Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. - 07/26/2004