Specifications

FCS1362 Page 44 of 74 © Nov 2010
If the ignition sense facility is not required it still may need to be connected to a permanent positive
supply to ensure the equipment functions. Follow equipment manufacturer’s instructions and
recommendations at all times.
In either event the ignition feed to the equipment must be via an in-line fuse of the correct current rating.
4.6.5.2. Provision of an ignition feed
If equipment is solely powered from a positive feed controlled by the vehicle’s ignition switch the feed
must be checked to ensure it can supply adequate current for both the equipment being installed and
other vehicle or supplementary equipment connected to it.
Consult with the vehicle manufacturer to determine a suitable ignition feed.
The ignition feed to the equipment must be via an in-line fuse of the correct current rating.
4.6.6. Vehicle supply greater than 12 volt
A 12 volt tap must not be taken from the batteries of a vehicle that has a supply greater than 12 volts.
Where a vehicle has a supply greater than 12 volts then it is essential that either the equipment is rated
for the higher voltage or a suitable regulator or converter is used that will provide the nominal supply
voltage and current for which the equipment is designed.
4.6.6.1. Voltage regulator/converter
Any regulator used must be compliant with requirements in section 2.2. Also, if applicable, see section
4.6.7.1
A means of switching off the regulator or converter must also be provided. This can be via the ignition
feed acting as a sense, direct switching from the mobile radio, a master switch or some other means
agreed with the customer.
The supply cable to the regulator or converter must be as short as practicable and suitable fuses should
be fitted to the input and output leads as close as possible to the supply.
The converter unit must be securely mounted in accordance with the manufacturer’s instructions.
Unless the converter unit is suitably environmentally protected it must be located in a dry and well-
ventilated position.
4.6.7. Isolated power supply
The installation of the mobile radio equipment should be carried out to maintain the integrity of the vehicle
isolated power supply.
4.6.7.1. 24V or higher isolated supply
When a 24 volt, or higher, supply is used on an isolated return vehicle system, a suitable DC converter,
providing DC isolation, i.e. no DC continuity between battery and output, must be used. After fitting the
converter, it must be verified that isolation has been maintained, see section 4.7.2.1.
4.7. Basic checks of an installation
Once physical installation of equipment has taken place it should be checked. The installation must be
safe prior to applying power for further checks.
4.7.1. Equipment power supply checks
The equipment power supply checks should be undertaken prior to power being applied to the newly
installed equipment.
The power source should be checked for reversed polarity prior to connection to the installed equipment.
Fuses should be verified to ensure that they are the correct rating for the installation.