23 Year Industrial Explosion-Proof Manufacturer

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Maintenance Methods

Inspection for Loss of Explosion-Proof Capability in Explosion-Proof Electrical Equipment

1. Explosion-proof Enclosures

Explosion-proof enclosures must be clean and intact, with clear markings. A loss of explosion-proof capability occurs in cases such as: cracks, weld openings, or obvious deformations in the enclosure; use of explosion-proof parts not approved by national inspection agencies; rust inside or outside the enclosure exceeding 0.2mm in thickness; ineffective locking devices; loose, cracked, or non-explosion-proof windows; connection or junction boxes without insulation; and insufficient electrical clearance or creepage distance.

explosion proof electrical equipment

2. Explosion-proof Joint Surfaces

The surfaces of explosion-proof enclosures should be smooth, complete, and rust-protected. Loss of explosion-proof capability is indicated by: insufficient length or diameter of plane and cylindrical explosion-proof surfaces, improper surface finish, excessive gap between motor shaft and bore, improperly covered motor junction boxes, missing bolts, or improperly compressed spring washers.

3. Cable Entry Devices

Loss of explosion-proof capability in cable entry devices occurs when: sealing rings or baffles are missing, causing looseness; the inner diameter of the sealing ring exceeds the cable’s outer diameter by more than 1mm; multiple sealing rings are used in one entry or multiple cables pass through a single hole; and when sealing rings are cut open, preventing full coverage over the cable, or when other layers between the sealing ring and cable are separated.

4. Wiring

Loss of explosion-proof capability in wiring is indicated by: exposed core wires or shielding layers in rubber sheathed cables, significant cracks in the cable, disorganized wiring in switches, ability to push or sway steel ropes, and when sealing rings are placed directly on the lead sheath of armored cables, or when cable insulating heads are cracked.

5. Sockets and Lighting Fixtures

Improper connections of explosion-proof sockets or lack of explosion-proof protection devices, and explosion-proof lights without screwless sockets or without interlocking devices, indicate a loss of explosion-proof capability.



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