Document ID: chunk:federal_register_of_legislation:F2018C00341:body:0:p27
Version: federal_register_of_legislation:F2018C00341
Segment Type: other
Provision Reference: 
Character Range: 80477–83374

12 or 24 volt operation. The voltage must be marked on the plug and a warning label must be provided in the cabin to warn the driver. The power supply must provide DC current having a nominal voltage level of 12 volts or 24 volts.

       1.3.2     The connector must be wired to have the following functions:

       1.3.2.1 For 12 volt operation
        Pin 1  +ve high current trailer solenoid valve supply, 20 amps minimum continuous rated capacity 30 amps maximum capacity
        Pin 2  +ve low current trailer electronic unit supply, 4 amps minimum rated capacity
        Pin 3  -ve low current trailer electronic unit supply, 6 amps minimum rated capacity
        Pin 4 -ve high current trailer solenoid valve supply, 20 amps minimum continuous rated capacity 30 amps maximum capacity
        Pin 5 trailer 'Antilock System' failure, switched to -ve (eg pin 3 or pin 4) upon fault detection, 2 amps minimum rated capacity.

       1.3.2.2 For 24 volt operation
       Pin 1  +ve high current trailer solenoid valve supply, 10 amps minimum continuous rated capacity 15 amps maximum capacity
       Pin 2  +ve low current trailer electronic unit supply, 2 amps minimum rated capacity
       Pin 3  -ve low current trailer electronic unit supply, 3 amps minimum rated capacity
       Pin 4 -ve high current trailer solenoid valve supply, 10 amps minimum continuous rated capacity 15 amps maximum capacity
       Pin 5 trailer 'Antilock System' failure, switched to -ve (eg pin 3 or pin 4) upon fault detection, 1 amp minimum rated capacity.

       1.3.3     Either the optical warning lamp specified in clause 1.2.1 of this APPENDIX or an additional yellow optical warning signal (appropriately labelled) must light up whenever Pin 5 of the connector specified in clause 1.3.2 of this APPENDIX is connected to ground or a -ve connector.

APPENDIX 1 – Annex 1
       Additional Provisions for vehicles of categories MD4, ME, NB or NC.

       1.1 Where a vehicle is equipped to tow a trailer, it must be fitted with an electrical connection for the 'Antilock System' meeting Appendix 1 clauses 1.3.1 to 1.3.3.

       1.1.1    Where the vehicle also provides an electrical 'Control Signal' via an electric 'Control Line', the electrical connection shall conform to ISO 11992-1 and 11992-2:2003 and be a point-to-point type using the seven pin connector according to ISO 7638-1 or 7638-2:1997. The data contacts of the ISO 7368 connector shall be used to transfer information exclusively for braking (including the 'Antilock System') and running gear (steering, tyres and suspension) functions as specified in ISO 11992-2:2003.

        The braking functions have priority and shall be maintained in the normal and failed modes. The transmission of running gear information shall not delay braking functions. The power supply, provided by the ISO 7638 connector, shall be used exclusively for