Free · Independent · Candidate-First
Whether you're preparing for Ex01âEx04 for the first time or working through your 5-year refresher â this is where you come to understand, prepare, and arrive ready. Free. Independent. Not tied to any provider.
Where to begin
Start here. Every path through TEU begins with understanding where you are and what you actually need.
New to Gas & Vapours hazardous areas qualifications. Want to understand what's involved, how to prepare, and what to expect on the 5-day course.
Start here â new candidateExisting certificate holder. Need to understand the RPP refresher route, what the renewal process involves, and how to prepare.
Refresher and RPP routeUnsure whether you need Gas & Vapours, Dust, Fuel Forecourts, Design, or another route. Need to understand the landscape before booking anything.
Which route do I need?Have some experience of the qualification already â possibly a first attempt. Want to understand what catches candidates out and how to approach it differently.
Common mistakes â Gas & VapoursQualification Routes
TEU covers the full qualification family â from Gas & Vapours (our deepest authority) to Dust, Fuel Forecourts, Mechanical, Design and beyond.
Our deepest coverage. Written by someone who has passed this multiple times. Installation, inspection, maintenance â theory and practical. The 5-day course. What catches people out.
Dust atmosphere qualifications. Parallel structure to Gas & Vapours but distinct in scope, classification, and equipment requirements. Overview and structured guidance.
Fuel forecourt hazardous areas qualifications. Defined scope and audience. Structured guidance on what's involved, who it's for, and how it differs from the core gas route.
Water treatment hazardous areas routes. Honest overview of scope, audience, and what distinguishes this from the gas and vapours track.
The design route â for engineers with area classification and design responsibility. What it covers, who it's built for, and how it sits differently to the installation and inspection routes.
The Responsible Persons route â for duty holders, safety managers, and those with legal accountability for hazardous area compliance. Who needs it and what it covers.
Practical Preparation
Knowing the theory is not the same as being ready for the practicals. This section covers the hands-on material that candidates most often wish they had prepared better.
Glanding, cabling, installation. What the assessor watches for. The errors that cost candidates marks they cannot recover.
Build Day guide âCable gland selection, installation, and common errors. The practical knowledge that most textbooks cover too lightly.
Glands & Cables guide âEx d, Ex e, Ex i, Ex n, Ex p, Ex m â what each protection method is, what it protects against, and how to identify it correctly.
Protection Methods guide âZone 0, Zone 1, Zone 2 â and the Dust equivalents. Classification logic, common zone layouts, and how zoning affects equipment selection.
Zoning guide âFive days is mentally demanding. This section covers managing pressure, staying focused across the assessment, and approaching the exam in the right state of mind.
Calm & Focus âStandards, protection concepts, gas groups, temperature classes, and inspection categories â structured for quick reference during preparation.
Ready Reckoner âOur Editorial Rule
This is not modesty. It is the thing that makes TEU worth trusting. A site that bluffs its way through content it does not understand destroys the trust that makes the credible content valuable.
Ex01âEx04 Gas & Vapours gets our deepest, most detailed coverage â because we have lived and passed it, repeatedly. Other routes get honest structured guidance where public source material is strong, and clear overviews where it is not. Where we do not know enough, we say so and point you to better sources.
About TEU
I built The Engineering University because, after more than 40 years in Engineering and Hazardous Areas work, I have seen too many good people struggle with exams and assessments they could have passed with the right guidance and proper preparation. I am a Senior Instrument Engineer and Technical Authority, and this site is my way of laying things out clearly, calmly, and honestly for real candidates. TEU is free and independent — it is not a training provider, not an awarding body, and not tied to any one course company. "I've passed Ex01âEx04 more times than most people have attempted it. I built TEU because there was nowhere free, independent, and honest to prepare â just provider sales pages and dry official documentation. This is the resource I wish had existed."
Free Resources
Free to download. No email required. No account. No paywall.
Standards, protection methods, gas groups, temperature classes, and inspection categories â structured for fast reference during preparation.
View Ready Reckoner âWeek-by-week preparation guide for candidates booked onto the 5-day Gas & Vapours course. What to cover, in what order, and how.
Download Guide â200+ exam-style questions covering Gas & Vapours theory and practical scenarios. Free. No account. Use them as part of your preparation.
View Questions â