Ex Fundamentals

IP65, IP66, IP67 and IP68 are not interchangeable – and none of them is explosion proof. What each test proves, and which rating your installation needs.

Zone, gas group and temperature class are derived — not chosen. Here is how the three blocks are set, and the six lines a supplier needs to quote compliant equipment.

Flameproof, increased safety and intrinsic safety are three different answers to the same question. One fact about the device decides which one applies.

Read any Ex nameplate left to right: protection concept, gas group, temperature class, equipment protection level — and the ambient range that quietly limits where it may be installed.