All modifications to existing facility and projects and new facilities should be subject to inspection by the authority having jurisdiction or their authorized designee to verify compliance with the codes and standards in effect on the date that such work was approved by a final design review. If the installation involves a hazard to life, equipment, or property, current standards and codes should be used to mitigate the hazard.

According to OSHA, under the Department of Labor (DOL), there are specific rules that apply to all installations and others that apply retroactively to installations installed after certain dates. Requirements listed in Table 2-1 are applicable to all electrical installations regardless of the date that they were designed and installed. All electrical systems and pieces of equipment that were installed after March 15, 1972, shall comply with all the requirements of 29 CFR 1910.302 through 1910.308, and not just the requirements listed in Table 2-1.

All major replacements, modifications, repairs, or rehabilitation performed after March 15, 1972, on electrical systems and equipment installed before March 15,1972, are required to comply with all the requirements of 29 CFR 1910.302 to 1910.308. OSHA considers major replacements, modifications, or rehabilitation to be work similar to that involved when a new building or facility is built, a new addition is built, or an entire floor is renovated.

A revision to 29 CFR 1910, Subpart S, was implemented and became effective April 16, which contained revised parts of 29 CFR 1910.302 through 1910.308 that apply to electrical systems and equipment installed after April 1, 1981.

Table 2-1. OSHA regulations that apply to all installations, regardless of the time they were designed or installed.

See Table 2-2 for a list of the sections and regulations that apply to electrical installations and equipment installed after April 16, 1981.

Table 2-2. OSHA regulations that apply to those electrical installations only if they were designed and installed after April 16, 1981.