Windsor-Severence Fire Protection District
Heavy Rescue
Production Specification
SVI #774 Page 109 of 126 April 19, 2010
Circuits shall be provided with properly rated low voltage overcurrent protective devices. Such devices shall be readily
accessible and protected against heat in excess of the overcurrent device’s design range, mechanical damage, and water
spray. Circuit protection shall be accomplished by utilizing fuses, circuit breakers, fusible links, or solid state equivalent
devices.
If a mechanical-type device is used, it shall conform to one of the following SAE standards:
1. SAE J156, Fusible Links
2. SAE J553, Circuit Breakers
3. SAE J554, Electric Fuses (Cartridge Type)
4. SAE J1888, High Current Time Lag Electric Fuses
5. SAE J2077, Miniature Blade Type Electrical Fuses
Switches, relays, terminals, and connectors shall have a direct current (dc) rating of 125 % of maximum current for which
the circuit is protected.
Power Supply
A 12 V or greater electrical alternator shall be provided. The alternator shall have a minimum output at idle to meet the
minimum continuous electrical load of the vehicle, at 200°F (93°C) ambient temperature within the engine compartment,
and shall be provided with full automatic regulation.
Minimum Continuous Electrical Load
The minimum continuous electrical load shall consist of the total amperage required to simultaneously operate the
following in a stationary mode during emergency operations:
1. The propulsion engine and transmission
2. All legally required clearance and marker lights, headlights, and other electrical devices except windshield wipers
and four-way hazard flashers
3. The radio(s) at a duty cycle of 10 percent transmit and 90 % receive (for calculation and testing purposes, a
default value of 5 A continuous)
4. The lighting necessary to produce 2 fc (20 lx) of illumination on all walking surfaces on the apparatus and on the
ground at all egress points onto and off the apparatus, 5 fc (50 lx) of illumination on all control and instrument
panels, and 50 percent of the total compartment lighting loads
5. The minimum optical warning system, where the apparatus is blocking the right-of way
6. The continuous electrical current required to simultaneously operate any fire pumps, aerial devices, and hydraulic
pumps
7. Other warning devices and electrical loads defined by the purchaser as critical to the mission of the apparatus
If the apparatus is equipped to tow a trailer, an additional 45 A shall be added to the minimum continuous electrical load
to provide electrical power for the federally required clearance and marker lighting and the optical warning devices
mounted on the trailer.
The condition of the low voltage electrical system shall be monitored by a warning system that provides both an audible
and a visual signal to persons on, in, or near the apparatus of an impending electrical system failure caused by the
excessive discharge of the battery set.
The charge status of the battery shall be determined either by direct measurement of the battery charge or indirectly by
monitoring the electrical system voltage.
If electrical system voltage is monitored, the alarm shall sound if the system voltage at the battery or at the master load
disconnect switch drops below 11.8 V for 12 V nominal systems, 23.6 V for 24 V nominal systems, or 35.4 V for 42 V
nominal systems for more than 120 seconds.
(116 strony)
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