Knowledge of ex certificate

- Jul 31, 2019-

IP Rating

Short for Ingress Protection Rating. Defined by IEC 60529, we see the IP Rating topic come up frequently in consumer electronics like mobile devices and smartwatches. As the rating only deals with the penetration of dust or liquids into the product, it has its limitations in the Ex world where there is often the explosion risk from gas fumes. Naturally if you are working in Ex areas Zone 20 or 21, or you are otherwise working with liquids (like paints), IP Ratings matter.
With Ex products, we typically use IP56 and IP66 ratings. The first digit of the rating indicates dust protection level, and the second digit is the liquid protection level. So, an IP56 rating means the product has level 5 dust protection. It’s not completely impervious (not dust tight), but most dust and dirt cannot get inside. And with level 6 protection against liquids, the product can withstand a reasonable spray, but should not be completely submerged in water. IP66 bumps the dust protection up to maximum – no dust particles can get inside.


Short for Korea Occupational Safety and Health Agency. Like INMETRO in Brazil, this is the local authority responsible for Ex product imports and distribution. 


Short for Light-Emitting Diode. The go-to modern day light source, LEDs have come a long way from their humble beginnings as little red indicators. In addition to visible light, they can be used to generate infra-red and even ultra-violet light.

Light Fixture

Light fixtures (UK English ‘light fittings’) in the everyday context refers to the whole luminaire – the light-emitting element (lamp or LED), the housing, the stand or mount, and the electrical wiring.