March 4, 2013 - Cabarrus County

labeled with circuit number and function. These labels shall match the “as built” wiring schematic included
with the vehicle(s) at time of delivery. It is preferred that this panel be mounted on or near the bulkhead of
the patient compartment. It must have a closed, locking, well ventilated cabinet. Electrical cabinets which are
accessed through exterior ambulance doors are not acceptable due to the possibility of the introduction of
dirt, moisture, or other undesirable and potentially damaging agents. All circuit breakers, relays, flashers and
diodes shall be mounted on this panel and be easily accessible.
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Wiring Criteria (2)
Adjacent to the main power distribution board there shall be the electronic control module. This module shall
include four (4) etched trace "printed" circuits connected to the total electrical system by three (3) computer
type cables. This module shall direct low voltage switch commands from the front and rear control panels to
the relays on the main power distribution board. This module shall include a five-minute delay timer circuit
for patient compartment dome lights to function as checkout lights. Opening the rear or curbside doors with
the battery switch off shall activate this circuit. After five minutes the circuit shall automatically turn off the
dome lights. Cycling the left dome circuit switch will reactivate the circuit. This module shall be capable of an
upgrade to include, if specified, an automatic sequencer circuit for emergency lighting and/or a load manager
circuit to automatically "unload" non-critical lighting in the event of battery or charging system problems.
There shall be spare jumper cards supplied with the vehicle for the logic board; one (1) each for the fiveminute
timer circuit and the sequencer/load manager circuits, if specified.
A six-inch service loop of wire or harness shall be provided at all electrical components, terminals, and
connection points. Circuit breakers shall be of the automatic reset type and designed specifically for each
circuit. One spare 15-ampere circuit breaker shall be provided for future use. All connections and terminals
provided shall comply with SAE J163, or J561 or J928 as applicable.
The main wiring harness for the module body shall be installed down the center of the patient compartment
ceiling. Each electrical circuit shall branch from the master harness as needed. There shall be no splices in this
harness. Each circuit wire shall run from the distribution panel to the fixture without a break or connection.
An access panel shall run the entire length of the center of the ceiling to simplify access to the "master" wiring
harness. A padded upholstery type material to prevent head injuries shall cover the access panel. This panel
shall be fastened to the ceiling with collared trim screws. Wiring runs accessed by removing interior cabinets
or portions thereof are not acceptable to the Purchaser.
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