Domestic Meters

  1. Meter installation is covered by which standard.
    BS 6400
  2. What does BS 6400 cover?
    The installation of gas meters.
  3. General requirements for the installation of a gas meter.
    • The meter must be secure and cannot move.
    • The meter connections must not be subject to mechanical strain.
    • The meter must not compromise a fire escape route.
    • The meter must not be fitted where it can get rusty or attacked by corrosive substances.
  4. BS6400 Part 1 covers
    Low pressure installations.
  5. BS 6400 Part 2 covers
    Medium pressure installations.
  6. BS 6400 Part 3 covers
    LPG installations.
  7. Low pressure
    Less than 75mbar
  8. Medium pressure
    75mbar up to 2bar.
  9. Can gas meters be installed internally.
    Low pressure gas meters can be installed internally provided that the meter is fitted as close as possible to the incoming supply pipe, to minimise the length of pipe running distribution pressure inside the house.

    Medium pressure meter installations must not directly enter the property.
  10. The semi-rigid pipe that takes up any strain caused by the pipework fitted to a gas meter is known as.
    A pliable connector or an Anaconda.
  11. The meter regulator must provide an operating pressure of
    21mbar +/- 2mbar. I.e. 19 to 23 mbar.
  12. The minimum flow rate to confirm that a meter regulator is providing the correct operating pressure is
  13. The meter regulator should lock up at what pressure?
    A pressure not exceeding 30mbar.
  14. What labels should a gas meter and ECV have?
    An ECV label indicating ON and OFF position.

    A label on the meter indicating to the user the procedure to be followed in the event of a gas leak, including an emergency contact phone number.
  15. Where should protective equipotential bonding be situated on a meter installation.
    Within 600mm of the meter outlet and before the first tee in the pipework.
  16. What diameter should the protective equipotential bonding be that is connected to the pipework of a domestic primary meter installation?
  17. What is the maximum pressure absorption allowed across a domestic meter installation, including pipework and fittings.
    The pressure drop must not exceed 4mbar when the installation is operating at its capacity.
  18. What is the maximum pressure drop allowed between the outlet of the (primary) meter and the appliance(s) that it supply.
    The maximum pressure drop must not exceed 1mbar.
  19. AECV
    Additional Emergency Control Valve
  20. When must an AECV be fitted.
    An AECV must be fitted if the meter is positioned more than 2m from the ECV or is less than 2m but fitted in another room or housing.
  21. Maximum throughput of E6, U6, and G4 meters.
    6m3 per hour
  22. Maximum throughput of U16 and G10 meters.
    16m3 per hour
  23. Medium pressure meter installations.
  24. Pressure control.
  25. Vent pipe.
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Domestic Meters
Domestic Meters