Short answer: Explosion-proof lighting inspection verifies the suitability and integrity of explosion-proof lighting fixtures used in explosive environments. It is evaluated within the framework of the IEC 60079 series and related protection types.
In explosive environments, an ordinary lighting fixture can be a source of ignition due to an arc or hot surface inside. Ex-proof fixtures eliminate this risk through their design.
However, a damaged glass, a loose bolt, or an incorrectly replaced gasket will invalidate the luminaire's protection class. Therefore, periodic inspection of Ex-proof lighting is critically important.
What is checked during an Ex-Proof Lighting Inspection?
- Luminaire protection type (Ex d, e, n) and environmental suitability
- Glass, housing and seal integrity.
- Ensuring that bolts and cable glands are complete and correct.
- Temperature class (T1–T6) and labeling compliance.
- Grounding and electrical connections.
Correct Protection Type and Temperature Class
Explosion-proof lighting fixtures must have the appropriate protection type and temperature class for their zone and the gas/dust group present. For example, the surface temperature of a fixture must remain below the ignition temperature of the gas in the environment (appropriate T class); the protection type must be at the level required by the zone. During inspection, it is not sufficient for the fixture to simply have an 'Ex label'; the protection type, gas group, and temperature class on the label must be verified to match the requirements of the installation location. Furthermore, gaskets that have deteriorated over time and missing bolts are specifically checked, as they compromise the integrity of the protection.
Legal Framework and Assessment
Explosion-proof equipment is subject to periodic inspections under the IEC 60079 series and explosive atmosphere regulations; these inspections are carried out and documented by authorized personnel.
Frequently Asked Questions
How often are explosion-proof fixtures checked?
Explosive atmosphere equipment is generally inspected at least once a year or at risk-based intervals.
Is a cracked glass a problem?
Yes; damaged glass or housing invalidates the explosion protection rating of the fixture and it must be replaced.
Why is the temperature rating important?
The surface temperature of the fixture must be within a range that will not ignite the gas in the environment.
Ex-Proof Lighting Systems Inspection — Accredited Service
For detailed information Explosive Atmosphere (ATEX/Ex-Proof) Inspections Please review our page for the legal framework. mandatory periodic inspection Check our guide.