---
title: "Basics of nomenclature, short forms and abbreviations"
space: "Wiki"
url: "https://www.sapconinstruments.com/wiki/is"
updated: "2026-10-18"
---

IEC : International Electrotechnical Commission

ATEX : ATmosphere EXplosibles

ia : Very High Protection Level - safe after two consecutive malfunctions

ib : High Protection Level - safe after one malfunction

ic : Normal Protection Level - safe under normal operation conditions

Ex : Explosion Proof, Explosion Protected, Ex Proof, Ex Rated

Ex i : Intrinsic safety

Ex d : Flameproof