The encapsulated type involves completely enclosing the components that may generate sparks or heat capable of igniting explosive mixtures within a compound or a non-metallic casing with adhesive bonding, ensuring that they cannot ignite dust layers or explosive environments under operating or installation conditions.
The above is the definition of potting type. In simple terms, it means to enclose the possible ignition sources so that they do not have the ability to ignite under normal operation and fault conditions. Common enclosure processes include die-casting and casting.
For equipment protected by potting type “m”, the compound, potting structure, equipment temperature, testing and marking need to be considered.
1. Consider the manufacturer of the compound used for potting, material composition, surface treatment, continuous operating temperature (COT), long-term heat resistance index TI (when used as part of the enclosure), insulation dielectric strength and water absorption.
2. The potting structure should take into account the internal net space volume limit, the thickness requirements of the potting compound at each point, the rated value limit of the internal switch contacts, the requirements for batteries and battery packs, the protection of permanently connected cables and exposed live parts, and the determination and protection of equipment faults.
3.Under normal operation and specified fault conditions, the maximum surface temperature should not exceed the limit value of the temperature class. Protective devices should be used to limit the temperature when necessary.
4. The equipment should meet the requirements of type tests, and be subject to routine inspections and tests as required. Markings should be made on the equipment as required.
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