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Small knowledge in explosion-proof certificate: The meaning of U and X marked after the explosion-proof certificate number

1. The representation of the symbol "U" in the explosion-proof certificate

The symbol used to represent Ex components. The so-called Ex component indicates that this component is only a part of the explosion-proof structure and cannot be used alone. It can only be combined with other components or parts to become a complete explosion-proof equipment. This component is often a universal accessory of the manufacturer.

Generally, a "U" is added after the explosion-proof certificate number of this Ex component.

For example: "CNEx16.8999U"

2. The representation of the symbol "X" in the explosion-proof certificate

A symbol used to indicate special safety usage conditions or limiting conditions. For example, requirements for limiting the installation position of equipment, requirements for selecting incoming cables, and instructions on the impact resistance energy of the casing.

Usually, an "X" is added after the explosion-proof certificate number, and the limiting conditions are explained in the remarks column. For example, the certificate of conformity for explosion-proof lamps is CNEx16.6788X, and the remarks column indicates that "this lamp is only allowed to be installed vertically downwards".

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