GB/T 38874.4-2020 Active

This part of GB/T 38874 specifies the general principles for the design and development of safety-related components (SRP/CS) of control systems. This part applies to agricultural and forestry tractors, self-propelled agricultural machinery, fully and semi-trailer agricultural machinery, agricultural traction machinery, and municipal machinery (such as road sweepers).
This part does not apply to:
——Agricultural aircraft and agricultural vehicles;
——Lawn and gardening equipment.
This part specifies the characteristics and categories required for SRP/CS to perform safety-related functions, but it does not specify performance levels for specific applications.
Note 1: Mechanical-specific Class C standards may specify agricultural performance levels (AgPL) for safety-related functions within their scope. Otherwise, the specification of AgPL is the responsibility of the manufacturer.
This part applies to safety components of electrical/electronic/programmable electronic systems (E/E/PES) related to electromechanical systems. This part covers the hazards that may arise from the failure behavior of E/E/PES safety-related systems (including the interaction between these systems). This part does not address hazards related to electric shock, fire, smoke, high temperature, radiation, toxicity, flammability, chemical reactivity, corrosion, or energy release, unless directly caused by the failure of E/E/PES safety systems. This part also covers the failure behavior of E/E/PES safety-related systems under non-E/E/PES hazards, involving protective measures, safeguards, or safety-related functions.
This part includes examples within the following scope:
——SRP/CS limits the current in electric hybrid systems to prevent insulation failure/electric shock hazards;
——Electromagnetic interference of SRP/CS;
——Fire protection design of SRP/CS.
This part does not include examples within the following scope:
——Insulatio