China Ex Standards

China Ex certification is primarily based on the GB/T 3836 series of standards, which define the safety requirements for electrical equipment used in explosive atmospheres. These standards are aligned with international IEC 60079 requirements and are widely applied in China’s hazardous area industries.

Key GB/T 3836 Standards

China Ex certification commonly involves the following standards:

GB/T 3836.1 — General Requirements

GB/T 3836.2 — Flameproof Enclosure “Ex d”

GB/T 3836.3 — Increased Safety “Ex e”

GB/T 3836.4 — Intrinsic Safety “Ex i”

GB/T 3836.5 — Pressurized Enclosure “Ex p”

GB/T 3836.8 — Type of Protection “Ex n”

GB/T 3836.9 — Encapsulation “Ex m”

GB/T 3836.31 — Protection Against Dust Ignition “Ex t”

GB/T 3836.28 — Equipment Protection Level (EPL) “Ex h”

Overview

These standards form the technical foundation of the China Ex certification system and are used to evaluate both electrical and non-electrical equipment intended for use in explosive gas and dust environments. Depending on the product type and application, additional related GB/T standards may also apply.