They are designed to contain internal explosions and prevent ignition of surrounding flammable gases or dust. In this article, we will explore three key aspects: certification standards, material selection, and application-specific design considerations. ·Flameproof enclosure (Ex db), which can be used as feed distribution equipment in control and distribution system (such as distribution box, switch box of main circuit, control box, terminal box or motor starting box etc. ) Enclosure: 304 stainless steel, 316L stainless steel and Q235. Explosive gas mixtures:. Copper-free Aluminium Alloy (carbon steel), powder-coated surface, or stainless steel. Special requirements on request. Found It Cheaper? We Match It! Need Help? Share your thoughts! How would you rate this. CZ Electric Co., Ltd was established in 1990, is a CZ1290 Explosion-proof distribution boxes suppliers, and is headquartered in Jiaxing City, Zhejiang Province, CZ can provide users with comprehensive explosion-proof safety system solutions. Products are widely used in engineering projects such as. For decades, the only explosion protection technology available in North America was the cast metal enclosure systems designed for Class I, Division 1 environments, also known as NEMA 7 explosionproof enclosures.