GB/T 3836.36-2022 Explosive atmospheres—Part 36:Electrical safety devices for the control of potential ignition sources from Ex Equipment

Scope

This document specifies the basic requirements, functional requirements, testing and verification, and marking and user manuals for electrical safety devices that control potential ignition sources in explosion-proof equipment. This document applies to electrical safety devices that perform safety functions to control potential ignition sources in electrical or non-electrical explosion-proof equipment in explosive environments. This document provides guidance for equipment manufacturers, where the use of electrical safety devices to reduce potential ignition sources in explosion-proof equipment in explosive environments becomes a potential effective ignition source. This document can also be applied to combinations of components that perform safety functions, such as: -- sensors; -- logic systems; -- final elements. This document can also be used for independent assessment of safety devices for specific explosion-proof equipment designs. Safety devices can serve as a measure to achieve the required equipment protection level (EPL) for explosion-proof equipment against potential ignition sources. The combination of safety devices and explosion-proof equipment will comply with the relevant standards for EPL in GB/T 3836 (all parts). However, increasing the EPL of explosion-proof equipment by simply adding safety devices is beyond the scope of this document. This document does not apply to: -- mechanical control devices, such as pressure relief valves, mechanical speed regulators, and other mechanical safety devices; -- the use of gas detection; -- control devices that prevent the formation of explosive environments, such as inerting systems and ventilation systems; -- explosion mitigation. Note: Some potential ignition sources may not be operable when controlled by safety devices. If the safety integrity level of electrical safety devices is determined in other parts of GB/T 3836, this document can be used as a reference for achieving the safety integrity level. Elect

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