What 29 CFR 1926.503 requires (plain English)
29 CFR 1926.503 is the training component of construction fall protection: the third part of the Subpart M trio, alongside 1926.501 (the duty to provide fall protection) and 1926.502 (the systems criteria). Fall protection equipment only works if workers understand the hazards and know how to use the systems correctly, so the standard requires the employer to train each employee who might be exposed to fall hazards, using a competent person as the trainer.
The training must enable each employee to recognize the hazards of falling and to follow the procedures that minimize those hazards. It covers the nature of fall hazards in the work area; the correct procedures for erecting, maintaining, disassembling, and inspecting the fall protection systems to be used; the use and operation of guardrail, personal fall arrest, safety net, warning line, controlled access zone, and safety monitoring systems; the role of each employee in any safety monitoring system; the limitations on mechanical equipment; the correct procedures for handling and storing equipment and materials; and the role of employees in fall protection plans.
Two administrative duties complete the standard. The employer must prepare a written certification record that includes the name (or other identifier) of each employee trained, the dates of the training, and the signature of the person who conducted the training or the employer. And the employer must retrain any employee when there is reason to believe the employee does not have the required understanding, for example, when workplace changes render previous training obsolete, when fall protection systems or equipment change, or when inadequacies in an employee's knowledge or use of the systems become apparent.