MET1 revision notes
Meters and the emergency control valve — installation, ventilation and tightness.
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BS 6400: Meter Housings, Regulators & ECV Access
Electrical Equipotential Bonding on Gas installations
Assess the need for main bonding, its connection position and the competence needed to correct defects.
Gas meter and emergency control valve (diagram)
The order of a domestic gas supply from the incoming service to the appliances, and why the emergency control valve must stay accessible.
Gas meter controls: ECV and meter ventilation
The emergency control valve, meter-box ventilation and why they exist.
Meter boxes: protection, ventilation and access
What a meter box is for and the features that make a boxed meter installation acceptable.
Meter installation and the emergency control valve
Why the emergency control valve drives how a meter installation is arranged.
Emergency Control Valve and Meter Regulator
Meter Location, Protection and Tightness Testing
Let-by and tightness test sequence (domestic)
The principle-level sequence for proving a domestic installation is gas sound.
Meter and gas testing terms glossary
Plain definitions of the meter, control and testing terms that come up in MET1.
Purging gas after meter or pipework work
Why and how an installation is purged so that no dangerous air or gas mixture is left in the pipework.
Where a gas meter can and cannot be located
The safety, access and protection reasoning behind acceptable and unsuitable meter positions.
Primary Meter Types & Components
Read a gas meter installation as a complete arrangement
MET1 revision brings the meter, regulator, emergency control and installation pipework together. When a question gives a pressure reading, name the measurement point and whether gas is flowing. Those details determine what the reading can establish.
Follow the MET1 guide for the installation checks and the gas-rate calculation guide for timed meter readings. Use the gas pipe-sizing worksheet when revising the downstream appliance load; calculating demand does not establish the condition of the meter or regulator.
In-depth guides for this module
Longer walkthroughs that sit alongside the revision notes.
MET1 revision guide: gas meters, regulators and the ECV
MET1 is about the meter installation itself: location, the ECV, regulator, seals, labels and leaving the installation safe.
BS 6891 gas pipe sizing explained: load, length and pressure drop
Gas pipe size is not chosen from boiler kW alone: each section needs its downstream load, route resistance, fuel, material and pressure-loss check.
More Gas modules
Every module has its own revision notes and question bank.