On February 14, 2007, the Occupational Safety and Health Administration (OSHA) published a final rule revising the electrical installation standard for general industry. The revised standard became effective on August 13, 2007. This standard [72 FR 7136] is intended to reduce the risk of injury and death caused by unsafe electrical installations.


Some of the requirements of sections 1910.303 through 1910.308 do not apply to all electrical installations. When using the standard, one must check §1910.302(b) to determine which requirements apply to the installation based on the time period in which it was built or last modified. This eTool is designed to do that for you.

Why are there six date columns instead of four?


Using this eTool

This eTool shows employers all of the Subpart S installation requirements that apply based on the time period in which an installation was built or last modified. This system will display only requirements applicable to an installation built or modified during that time period.

Just select the appropriate box in the table.

My installation was built or last modified:

Requirement Category On or before March 15, 1972 On or after March 16, 1972 up to and including April 15, 1981 On April 16, 1981 On or after April 17, 1981 up to and including August 12, 2007 On August 13, 2007 On or after August 14, 2007
General Requirements
Wiring Design & Protection
Wiring Methods & Equipment
Specific Purpose Equipment & Installations
Hazardous Locations
Special Systems

Note 1:The requirements displayed by this system for any given installation time period might not match the exact text of the standard. Asterisks indicate missing text and modified text is indicated by brackets.

Note 2: Information about the scope of Subpart S is contained in §1910.302(a).

Note 3: As indicated in §1910.302(c), the requirement in §1910.147(c)(2)(iii) that energy-isolating devices be capable of accepting a lockout device whenever replacement or major repair, renovation, or modification of a machine or equipment is performed, and whenever new machines or equipment are installed after January 2, 1990, applies in addition to any requirements in §1910.303 through §1910.308 that disconnecting means be capable of being locked in the open position under certain conditions.

OSHA developed this eTool to assist employers and workers in determining which provisions of 29 CFR 1910.303 through 1910.308 apply to an installation based on the date that installation was built or last modified. eTools are "stand-alone," interactive, Web-based training tools on occupational safety and health topics. Employers in States with OSHA-approved State plans should contact the State for specific information on State requirements, which may differ from Federal requirements. A list of States with OSHA-approved plans and contact information may be found on the OSHA website.

This eTool is intended to provide information about the Subpart S Electrical Standards. The Occupational Safety and Health Act requires employers to comply with safety and health standards promulgated by OSHA or by a state with an OSHA-approved state plan. However, this eTool is not itself a standard or regulation, and it creates no new legal obligations.

The Department of Labor/Occupational Safety and Health Administration maintains this Web site to enhance public access to the Department's information. This is a service that is continually under development. We will make every effort to keep this site current and to correct errors brought to our attention.