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Service entry, regulators, pipe sizing, plant room ventilation, commercial kitchens, interlocks, tightness testing, purging and commissioning. Each topic has its own page: the drawing first, then what you need to remember. 64 illustrated pages.
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Every page has one big drawing and a box with the numbers and steps you need to know:
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These are real pages from the book. The table of contents is the full one: 8 parts and 60 topics.
You're standing in a school plant room with 350 kW of boilers and you have to say whether the vents are big enough.
You read that section of the standard last week. But it was paragraphs and a table, and on site none of it comes back in order.
In the book, that job is one page: the plant room drawn, 350 kW totalled, the method chosen, the I.S. 820 figure applied and the grille free area checked against it.
The regulator, the restaurant kitchen supply, the interlock, the tightness test and purging work the same way: each one has its own page.
You see it, you follow it, and you know which figure to check in the standard, and why.
From domestic to non-domestic, supply and meters, pipework and sizing, plant rooms, commercial kitchens, tightness testing, purging and commissioning, and a review with exam-style practice: 64 pages, all illustrated.
Think of it this way:
You're on a restaurant fit-out. The chef wants a new range and the main contractor asks you whether the existing supply will carry it.
You open the book at the kitchen supply page and see it drawn: 100 kW turned into 9.2 m³/h, the run from the meter, and the pipe size checked.
The same goes for the regulator, the plant room vents, the interlock, the tightness test and purging: each one on its own page.
Non-Domestic Gas Illustrated is 8 parts and 60 topics, all drawn, with mistakes shown before and after, a site checklist and exam-style questions at the end.
What you see drawn, you don't have to memorize.
Where domestic ends, what changes on commercial jobs, who's who on site, natural gas and LPG, pressure tiers and the order of the job.
The service entry, the emergency control valve, meter installations, how a regulator works, safety devices, meter housings, labels and bonding.
Pipe materials, joints, routes, sleeves, supports, isolation valves, how sizing works, kW to m³/h and a worked kitchen supply.
Why a plant room needs air, high and low vents, mechanical ventilation, flues and terminals, access, gas detection and a worked vent sizing.
The commercial kitchen drawn, canopy and extract, make-up air, the ventilation–gas interlock and how to prove it, flexible connections and flame supervision.
What a tightness test proves, strength versus tightness, the equipment, installation volume, the test step by step, false readings and finding the leak.
Why and how to purge, purge volume, safe vent points, proving the purge, commissioning in order, gas rate at the meter, combustion checks and handover.
Mistakes before and after, the site checklist from survey to handover, the key numbers on one page and exam-style questions with answers.
At the end of the book: Mistakes shown before and after, a 9-box site checklist, the key numbers on one page and exam-style questions with answers.
Test yourself topic by topic with exam-style questions and clear answers, so you know what you've got and what to go back over.
Each frequent mistake drawn as before and after, so you spot it on site before the customer or the inspector does.
📄 This is a digital PDF book sent to your email: nothing is printed or shipped.
PDF by email: We email you Non-Domestic Gas Illustrated as a PDF, together with the two free books. It's a single payment: no installments, no extra charges.
Years of domestic jobs behind you and now commercial ahead: the book takes you through it in the order you'll work, supply to handover, one drawing per topic.
You go over it topic by topic, check yourself with the exam-style questions, and the key numbers sit on one page for the last look.
What you've done by ear for years, laid out page by page against I.S. 820. Print it and keep it in the van.
📄 This is a digital PDF book sent to your email: nothing is printed or shipped.
Try Non-Domestic Gas Illustrated for 30 days, bonus books included.
We refund everything if the file won't open, if the book isn't what you see here, if you were charged twice or if the email doesn't arrive. Just email us.
You pay once. No subscriptions.
Yes. It's written for installers who already know domestic work and need the commercial side: bigger pipework, plant rooms, kitchens, interlocks, testing and commissioning. It doesn't go back over the basics of the trade.
It's written for Ireland and checked against the current edition of I.S. 820 and the current requirements of the Registered Gas Installer scheme. The edition it was checked against is printed on the first page, and the test pressures and test times follow that edition. It's not UK material adapted. The worked examples use our own values, and we don't reproduce the text or tables of the standard.
No. It's an independent study guide. It is not affiliated with or endorsed by NSAI, CRU, RGII or any awarding body.
No. It's a book to study and go over the topics. It doesn't give you a certificate or count towards registration, and it doesn't replace the required training, the assessment or the standard itself.
No. They're exam-style questions written for this book, with answers, so you can test yourself topic by topic.
In PDF by email, to the address you enter at checkout. The two bonus books come the same way.
No. It's a one-off payment. No subscription.
Yes. The PDF is ready to print, so you can keep it in the van or on the desk.
You have 30 days. We refund everything if the file won't open, if the book isn't what you see on this page, if you were charged twice or if the email doesn't arrive: just email us.
No more rereading the standard with nothing sticking.
Plant room vents: you see them drawn once, and it sticks.
You go into the assessment knowing where everything is.
Drawings make studying faster.
The book is right below.
One-time payment: US$ 27 · Guarantee: 30 days · PDF by email
YES, I WANT NON-DOMESTIC GAS ILLUSTRATED FOR US$ 27📄 This is a digital PDF book sent to your email: nothing is printed or shipped.
