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Important terms and concepts in explosion-proof certification

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| 2020-10-10|Return

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

Now let's start withZhongnuo TestingInterpret the concept of common professional terms in explosion-proof certification for everyone.

Associated devices:Electrical equipment with built-in energy limiting circuits and non energy limiting circuits, and structurally designed to prevent non energy limiting circuits from having 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:Separately tested from the equipment casing, it can be used as a separate device for certification and can be installed as a cable entry device on the equipment casing

Explosion proof certificate:A document used to determine the compliance of equipment with standard requirements, type tests, and applicable routine tests. Certificates can be used forExEquipment orExComponents.

Connector:Terminals, screws, or other parts used for electrical connections with external circuit wires.

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

ExSealing components:Inspect separately from the equipment casing, and assemble threaded sealing components without additional conditions on the equipment casing with explosion-proof certification

ExComponent:Cannot be used alone with symbols"U"Components or components of electrical equipment for explosive environments that require additional certification when used in conjunction with electrical equipment or systems(Ex)Except for cable entry devices.

Maximum surface temperature:The maximum temperature reached by any component or surface of electrical equipment during operation under the most unfavorable operating conditions (but within the specified 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 passage, it refers to the parts of the explosion-proof shell where the surfaces or shell connections of different components are matched together and can prevent internal explosions from spreading to the explosive gas environment around the shell.

ExComponent housing:haveExExplosion proof certificate for components and uncertain air 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 information of the composite manufacturer, the composite can meet the temperature requirements of this section during the expected service life of the equipment.

Clamping components:The components introduced into the device are used to prevent pulling or twisting of the cable from being transmitted to the connector.

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

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


 

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