Explosion-proof motor full inspection record:What should an explosion-proof motor full inspection record include in 2026?

Q: What should an explosion-proof motor full inspection record include in 2026?

A: An explosion-proof motor full inspection record in 2026 should capture both the mechanical and Ex-specific condition of the unit, plus digital traceability data. Start with identification: asset tag, manufacturer, model, frame size, serial number, Ex marking (for example Ex db IIC T4 Gb or Ex eb IIC T3), IECEx or ATEX certificate number, IP rating, and hazardous area classification. Record visual inspection of the enclosure, flamepaths, cable entries, and glands for corrosion, cracks, or unauthorized modifications. Then document electrical tests: insulation resistance, winding resistance, no-load current, and three-phase balance, with actual measured values and instrument serial numbers. Functionally verify the breather and drain devices, terminal box integrity, and grounding/bonding continuity. Include thermographic readings taken under load, vibration signatures, and bearing temperatures where applicable. Crucially, the 2026 record should include a QR-coded digital entry linked to the CMMS, inspector identity with competency certification, date, ambient conditions, and any corrective work orders raised. This gives auditors a complete, tamper-evident history proving the motor remained compliant with IEC 60079-17 and IEC 60079-19 throughout its service life.

Q: How often must an explosion-proof motor full inspection record be updated under IEC 60079-17?

A: Under IEC 60079-17, the required interval depends on the inspection grade and the site's hazardous area risk assessment, not on a single fixed number. A full inspection record is typically updated at each scheduled detailed inspection, which many operators set annually, with periodic visual checks monthly or quarterly. In high-risk or Zone 0/Zone 1 installations, or where corrosive atmospheres and heavy vibration exist, the interval should be shortened, sometimes to six months or even quarterly. The 2026 edition of IEC 60079-17 continues to emphasize a risk-based approach: the equipment's age, duty cycle, environmental severity, and historical failure data all influence the interval. After any repair, overhaul, or rewind to IEC 60079-19, a new full inspection record must be created rather than simply amended, because flamepath dimensions and Ex certification status may change. The record should state the inspection grade performed (visual, close, or detailed), the next due date, and the rationale for the chosen interval. Regulators increasingly expect a documented risk assessment justifying the frequency, so treat the record not as a formality but as a living compliance document that drives the maintenance plan.

Q: What are common failures found during an explosion-proof motor full inspection, and how should the record reflect them?

A: Common findings during a full inspection of flameproof and increased-safety motors include damaged or corroded flamepaths, worn bearings causing rotor eccentricity, moisture ingress through failed breathers or drain plugs, loose or incorrect cable glands, degraded terminal insulation, and unauthorized enclosure modifications that void Ex certification. Each finding must be recorded with its exact location, measured value, and severity, not just a tick box. For example, record the actual flamepath gap against the permitted maximum, and note any corrosion pitting depth. Include photographic evidence and thermographic or vibration data supporting the diagnosis. The record should then classify the defect against the site's acceptance criteria and IEC 60079-17, state whether the motor may remain in service, requires restricted operation, or must be isolated, and reference the corrective work order. If a repair is needed, the record must show whether the work falls under IEC 60079-19 and that a competent Ex repair facility was used. Finally, close the loop by updating the record after repair with re-test results, revised certification links, and the signature of the responsible Ex inspector, so the audit trail remains complete from detection through restoration.

Dialogue about

Common scenarios of "Explosion-proof motor full inspection record"

【Quality Inspector】 Good morning, everyone. We're here to conduct a full inspection record review for the explosion-proof motors. Let's start with the basic information. Can you confirm the motor model and quantity?

【Production Manager】 Sure. The motors are model YB3-315L1-4, and we have 10 units in this batch. They were manufactured last week.

【Quality Inspector】 Great. I'll need to check the explosion-proof certificates and nameplate details. Are the certificates up to date?

【Certification Specialist】 Yes, all certificates are valid. The explosion-proof grade is Ex d IIB T4 Gb, and they are certified by NEPSI. The certificates are attached to the inspection records.

【Quality Inspector】 Good. Now, let's move to visual inspection. Have all motors been checked for any physical damage, such as cracks or corrosion?

【Assembly Technician】 Yes, I personally inspected each motor. All enclosures are intact, no cracks or corrosion. The paint is also in good condition.

【Quality Inspector】 Excellent. Next, we need to verify the flameproof joints. Are the gaps within the specified limits?

【Assembly Technician】 We measured the joint gaps using a feeler gauge. The maximum gap is 0.15 mm, which is within the allowed 0.2 mm for IIB group.

【Quality Inspector】 That's correct. Now, let's check the cable entries and sealing. Are the cable glands explosion-proof and properly sealed?

【Certification Specialist】 Yes, we used certified Ex d cable glands. Each entry is sealed with a sealing ring and compound to maintain the IP66 rating.

【Quality Inspector】 Good. Insulation resistance test: what were the results?

【Test Engineer】 We performed the test at 500V DC. The insulation resistance for all motors is above 100 MΩ, which is well above the minimum requirement of 20 MΩ.

【Quality Inspector】 High resistance is good. Now, high-voltage test: did you apply the test voltage and for how long?

【Test Engineer】 Yes, we applied 2kV AC for 1 minute between windings and frame. No breakdown occurred. All passed.

【Quality Inspector】 Great. Temperature rise test: what were the results under full load?

【Test Engineer】 We ran the motors at full load for 2 hours. The maximum temperature rise on the windings was 65K, which is within the Class F insulation limit of 80K.

【Quality Inspector】 Good. Now, let's check the explosion-proof aspects: did you verify the flameproof enclosure integrity after assembly?

【Assembly Technician】 Yes, we performed a pressure test at 1.5 times the reference pressure. No deformation or leakage was observed.

【Quality Inspector】 Perfect. Finally, are all inspection records complete and signed off? We need to ensure traceability.

【Production Manager】 Yes, all records are filled out, including test data, inspector signatures, and dates. We also have the material certificates and routine test reports attached. Everything is ready for your final review.