ISO/TS 28923:2012 specifies the safety requirements and their verification for the design and construction of fixed guards to be opened by the use of a tool and interlocking movable guards for moving parts of the power transmission on self-propelled ride-on machines and mounted, semi-mounted or trailed machines used in agriculture. In addition, it specifies the type of information on safe working practices (including residual risks) to be provided by the manufacturer.

It deals with the significant hazards, hazardous situations and events relevant for fixed guards to be opened by the use of a tool and interlocking movable guards of moving parts of power transmission used as intended and under the conditions foreseen by the manufacturer.

It is not applicable to guards of moving parts of the power transmission of agricultural and forestry tractors, aircraft and air cushion vehicles used in agriculture, lawn and garden equipment, or guards for PTO drive shafts between agricultural and forestry tractors and mounted or towed implements.