ASME A17.3

This Code ofsafety standards covers existing elevators,escalators, and their hoistways (except as modified by 1.1.2).

The American Society of Mechanical Engineers (ASME) has published since 1921 a safety code for elevators, escalators,and related equipment. The following is a brie fhistory  of how the various editions of this Code addressed the matter of retroactive requirements for existing installations. The 1921 edition did not differentiate between new and existing installations.