Which set of regulations places the primary legal duty on gas operatives to ensure domestic gas appliances and installations are safe?
Gas Safety Legislation
Question · Easy
ACS CCN1 2026: Free Guide to the Core Gas Assessment
What the ACS CCN1 Core Domestic Natural Gas Safety assessment covers in 2026: registration route, appliance categories, the IGEM/UP/1B Edition 4 change, costs and prep.
Blog
What does GSIUR 1998 stand for and what does it govern?
Gas Legislation & GSIUR
Flashcard
Under GSIUR 1998, a person carrying out gas work for hire or reward in domestic premises must be registered with which body?
Which 1998 statutory instrument covers domestic appliance work and landlord duties in Great Britain?
Gas legislation
Guess the Term
Chapter 0: Introduction & ACS CCN1 Overview
0.1 ACS CCN1 Assessment Format, Open-Book Strategy & Gas Safe Path
Study guide
Cheat sheet
What is the approximate gross calorific value (CV) of UK natural gas used when calculating heat input?
Gas Rating Calorific Value
Question · Medium
Read the clue and guess the term in 6 tries.
Game
Which body must a gas operative working for hire or reward be registered with, and what did it replace?
When gas rating a domestic appliance on a metric (m3) meter, what does the timed test dial reading allow you to calculate?
What statutory term describes gas getting into premises, which the responsible person must act on at once by shutting off the supply?
Emergency actions
What is the standard nominal operating (working) pressure for natural gas at the outlet of a domestic meter?
How often must a landlord arrange a gas safety check on relevant appliances and flues, and what record is issued?
Before applying a tightness test on a domestic installation with a U6/G4 meter, why is a let-by test performed first?
Tightness Testing Let By
Which abbreviation names the shut-off intended for consumers to stop the supply of gas when it escapes, unlike an AIV at one appliance?
Emergency isolation
0.2 Properties of Natural Gas, Fuel Gas Classification & Combustion Basics
On a domestic natural gas installation, what test pressure is applied during a tightness test using a U6/G4 meter?
Swap tiles to line up three of the same term.
Term Match
Which body enforces gas safety law, and which body holds the operative register?
What is the duration of the timed tightness test (after stabilisation) on a domestic installation?
What at the burner should be blue when combustion is complete but may be yellow or orange when it is not?
Combustion
On an existing installation with a U6/G4 meter and pipework up to 28mm with appliances connected, what is the maximum permissible pressure drop over the 2-minute tightness test?
Question · Hard
What must an operative hold to prove competence for domestic natural gas work under GSIUR?
On a NEW domestic installation with no appliances connected (pipework only), what pressure drop is permitted during the tightness test?
What device sounds an early warning of carbon monoxide but must not replace regular servicing and safety checks?
Chapter 1: Gas Safety Legislation & Regulations
1.1 Gas Safety (Installation and Use) Regulations 1998 (GSIUR) — Operative Duties
If a smell of gas is reported and you cannot trace or stop an escape, what is the correct immediate action?
Emergency Unsafe Situations
Flip two cards at a time to find matching terms.
Term Pairs
On discovering a dangerous gas appliance you were not called to work on, what must you do?
Under the Gas Industry Unsafe Situations Procedure (GIUSP / IGEM/G/11), which classification applies to a situation that, if left connected, is an immediate danger to life or property?
What must be supplied in adequate quantity for gas to burn completely, so that ventilation must never be blocked?
Ventilation
Under GIUSP, what does the classification 'At Risk' (AR) mean?
Under GSIUR, may an operative leave an appliance they know to be immediately dangerous connected and in use?
What CO/CO2 ratio is the generally accepted maximum for a correctly operating domestic gas appliance during combustion analysis?
Combustion Co Co2 Analysis
Besides an air vent, which ventilation fitting must be sized by free area and identified as a correct or incorrect type?
1.2 Gas Safe Register Rules, Competence Categories & Operative ID Cards
What is the principal product of complete combustion of natural gas (methane) alongside water vapour?
Find five hidden terms in a grid of letters.
Term Search
What is the nominal working (operating) pressure of natural gas at a domestic meter outlet?
Tightness Testing & Let-By
For an open-flued gas appliance, why is a spillage test carried out after installation or servicing?
Flue Flow Spillage
What verb describes safely removing all air from installation pipework so that only the gas to be supplied remains?
Pipework
Which British Standard governs flueing and ventilation provision for domestic gas appliances of rated input not exceeding 70kW net?
Ventilation Requirements
What is the purpose of the let-by test, and at what pressure is it carried out?
Per BS 5440-2, what free ventilation area is generally required per kW of net heat input above the first 7kW for an open-flued appliance in a room?
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