In this Schedule—

• “an accredited testing laboratory” means a testing laboratory which has been accredited by the United Kingdom Accreditation Service or by an equivalent body in another EEA State under European Standard EN 45001 : 1989 for general criteria for the operation of testing laboratories (British Standard BS 7501 : 1989);

• “articulating connector” means a connector bridging the space between two separate and rigid vehicle structures;

• “bar” means bar gauge;

• “BS 5430 : Part I : 1990” means—

  1. a

     Part I of the British Standard for the periodic inspection, testing and maintenance of transportable gas containers (excluding dissolved acetylene gas containers), published by the British Standards Institution under the reference BS 5430 : Part I : 1990; or

  2. b

     any equivalent standard published by a recognised testing body in another EEA State;

  and, in a case falling within paragraph (b), a reference in this Schedule to any particular provision of the British Standard is to be taken as a reference to the equivalent provision of any such EEA equivalent standard;

• “compressed natural gas” means natural gas stored at a pressure above 30 bar;

• “design pressure” means the pressure that a part of a gas propulsion system has been designed to withstand;

• “gas container” means a container for gas falling within paragraph 2(1);

• “g” means gravity;

• “high pressure” means a pressure exceeding 7 bar;

• “large bus” means a vehicle constructed or adapted to carry more than 16 seated passengers in addition to the driver;

• “low pressure” means a pressure not exceeding 75 millibars;

• “medium pressure” means a pressure not exceeding 7 bar but exceeding 75 millibars; “millibars” means millibars gauge;

• “mm” means millimetres;

• “mm²” means square millimetres;

• “N” means newtons;

• “°C” means degrees Celsius;

• “pipeline” means any pipe or passage connecting any two parts of a gas propulsion system;

• “pressure relief device” means a device to protect a gas container against over-pressure; and

• “regulator” means a device that automatically reduces and controls the pressure of the gas flowing through it.