Of the three primary fall-protection systems the Occupational Safety and Health Administration's (OSHA's) construction regulations specify for workers, personal fall-arrest (PFA) systems can be one of the more complex to use correctly.
A PFA system usually is composed of a body harness, rope-grab lanyard attached to the D-ring on the back of the harness, lifeline to which the rope-grab attaches and anchor to which the lifeline attaches with a snap hook.
Complying with OSHA
Arresting forces applied to the human body when stopping a fall can be substantial. According to OSHA rules, the arresting force must be limited to 900 pounds when a body belt is used and 1,800 pounds when a body harness is used.