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In explosion-proof certification, there are many professional terms, such as glass components in explosion-proof, which are called transparent components. For example, the screws and nuts that fix the shell are called fasteners......

Below, Zhongnuo Testing will explain the concepts of common professional terms in explosion-proof certification.

Associated devices:Electrical equipment that contains energy limiting circuits and non energy limiting circuits, and is structurally designed such that non energy limiting circuits cannot have adverse effects on energy limiting circuits.

Cable entry device:Allow one or more cables or optical cables to be introduced into electrical equipment and ensure their safetyExplosion proof typeThe device.

ExCable entry device:A cable entry device that can be tested separately from the equipment casing and can be used as a separate device for certification, and can be installed on the equipment casing

Explosion proof certificate：The document used to determine whether the equipment meets the requirements of standards, type tests, and routine tests for adaptation. Certificates can be targeted towardsExEquipment orExComponents.

Connector:Terminals, screws, or other components used for electrical connection with external circuit wires.

Equipment protection level:The protection level of equipment is determined based on the possibility of it becoming an ignition source and the different characteristics of explosive gas environment, explosive dust environment, and coal mine A burning explosive environment.

ExSealing components:Inspection shall be conducted separately from the equipment casing, and threaded sealing elements that do not require additional conditions shall be assembled on the equipment casing with explosion-proof certification

ExComponents:Cannot be used alone with symbols"U"'When used in conjunction with electrical equipment or systems, components or parts of electrical equipment for explosive environments that require additional certification(ExExcept for cable entry devices.

Maximum surface temperature:The maximum temperature reached by any component or surface of electrical equipment when operating under the most unfavorable operating conditions (but within the prescribed allowable range).

Working temperature:The temperature reached by the equipment under rated operating conditions.

Explosion proof type:Various specific measures taken on electrical equipment to prevent ignition of the surrounding explosive environment.

Explosion proof joint surface:Also known as flame path, it refers to the surface or shell connection of different components of the explosion-proof shell that are matched together and can prevent internal explosions from spreading to the explosive gas environment around the shell.

ExComponent casing:haveExExplosion proof certification for components and uncertain explosion-proof enclosures for internal equipment. When the entire device is takenExplosion proof certificateThe shell does not require repeated type testing.

Creepage distance:The shortest distance between two conductive parts along the surface of the insulating material.

Electrical clearance:The shortest spatial distance between two conductive components.

Continuous operating temperature of the composite(COT)：According to the manufacturer's information, the composite can meet the temperature requirements of this section during the expected service life of the equipment.

Clamping components:The component introduced into the device to prevent the transmission of cable pulling or twisting to the connecting piece.

Pressing parts:The component used in the cable entry device to apply pressure to the sealing ring to ensure its effective function.

seal ring:The ring used in cable entry devices or conduit entry devices to ensure the sealing between the entry device and the cable or conduit and cable.

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