Earthing of FL vehicles

Tanks made of metal or of fibrereinforced
plastics material of FL tank-vehicles and battery elements
of FL batteryvehicles
shall be linked to the chassis by means of at least one good electrical
connection. Any metal contact capable of causing electrochemical corrosion shall be avoided.
NOTE: See also and

Stability of tank-vehicles

The overall width of the ground-level bearing surface (distance between the outer points of contact
with the ground of the right-hand tyre and the left-hand tyre of the same axle) shall be at least 
equal to 90% of the height of the centre of gravity of the laden tank-vehicle. In an articulated 
vehicle the mass on the axles of the load-carrying unit of the laden semi-trailer shall not exceed 
60% of the nominal
total laden mass of the complete articulated vehicle.

In addition, tank-vehicles with fixed tanks with a capacity of more than 3 m3 intended for the carriage
of dangerous goods in the liquid or molten state tested with a pressure of less than 4 bar, shall comply
with the technical requirements of ECE Regulation No. 111 1 for lateral stability, as amended, in
accordance with the dates of application specified therein. The requirements are applicable to tankvehicles
which are first registered as from 1 July 2003.

Rear protection of vehicles

A bumper sufficiently resistant to rear impact shall be fitted over the full width of the tank at the rear
of the vehicle. There shall be a clearance of at least 100 mm between the rear wall of the tank and the
rear of the bumper (this clearance being measured from the rearmost point of the tank wall or from
projecting fittings or accessories in contact with the substance being carried). Vehicles with a tilting
shell for the carriage of powdery or granular substances and a vacuumoperated
waste tank with a
tilting shell with rear discharge do not require a bumper if the rear fittings of the shell are provided
with a means of protection which protects the shell in the same way as a bumper.
NOTE 1: This provision does not apply to vehicles used for the carriage of dangerous goods in
MEGCs or portable tanks.
NOTE 2: For the protection of tanks against damage by lateral impact or overturning, see
and or, for portable tanks, and

Combustion heaters

Combustion heaters shall meet the requirements of,, and the following:
(a) The switch may be installed outside the driver's cab;
(b) The device may be switched off from outside the load compartment; and
(c) It is not necessary to prove that the heat exchanger is resistant to the reduced afterrunning
In addition for FL vehicles, they shall meet the requirements of and

If the vehicle is intended for the carriage of dangerous goods for which a label conforming to models
Nos. 1.5, 3, 4.1, 4.3, 5.1 or 5.2 is prescribed, no fuel tanks, power sources, combustion air or heating
air intakes as well as exhaust tube outlets required for the operation of the combustion heater shall be
installed in the load compartment. It shall be ensured that the heating air outlet cannot be blocked by
cargo. The temperature to which the load is heated shall not exceed 50 ºC. Heating devices installed
inside the load compartments shall be designed so as to prevent the ignition of an explosive
atmosphere under operating conditions.

Electrical equipment

The electrical installation on FL vehicles shall meet the relevant requirements of,,,,, and
However additions to or modifications of the electrical installations of the vehicle shall meet the
requirements for the electrical apparatus of the relevant group and temperature class according to the
substances to be carried.
NOTE: For transitional provisions, see also 1.6.5.
1 ECE Regulation No. 111: Uniform provisions concerning the approval of tank-vehicles of categories N and O
with regard to rollover stability.

Electrical equipment on FL vehicles, situated in areas where an explosive atmosphere is, or may be
expected to be, present in such quantities as to require special precautions, shall be suitable for use in
a hazardous area. Such equipment shall meet the general requirements of IEC 60079 parts 0 and 14
and the additional requirements applicable from IEC 60079 parts 1, 2, 5, 6, 7, 11 or 18. The
requirements for the electrical apparatus of the relevant group and temperature class according to the
substances to be carried shall be met.
For the application of IEC 60079 part 14, the following classification shall be used:
Inside tank compartments, fittings for filling and discharge and vapour recovery lines.
Inside cabinets for equipment used for filling and discharge and within 0.5 m of venting devices and
pressure relief safety valves.

Permanently energized electrical equipment, including the leads, which is situated outside Zones 0
and 1 shall meet the requirements for Zone 1 for electrical equipment in general or meet the
requirements for Zone 2 according to IEC 60079 part 14 for electrical equipment situated in the
driver's cab. The requirements for the relevant group of electrical apparatus according to the
substances to be carried shall be met.

Additional safety requirements concerning EX/III vehicles

EX/III vehicles shall be equipped with automatic fire extinguisher systems for the engine

Protection of the load by metal thermal shields against tyre fire shall be provided.

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