Specifications

December 2013
REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-24
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14.3 Battery Terminals/Wiring/Protection
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a. The battery wiring shall be terminated with properly sized ring terminals. The
batteries shall include 7/16” positive and 3/8” negative terminals. The cable shall
be permanently marked with a "+" and "-" at the battery end. Cables shall be
extra flexible and routed in the battery box so as not to chafe or rub on the
battery tray and other components. Cables shall allow full slide-out of the tray.
Cable ends shall be sealed to eliminate corrosion from battery acid and/or fumes.
Cable ends shall be attached to the battery studs with non corroding flat
washers, spring washers and brass nuts. Cable ends will be coated with a
corrosion inhibitor after being attached to the batteries.
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b. A circuit breaker capable of interrupting a major short circuit shall be supplied on
the positive side of the batteries. The breaker shall be located near the batteries
in an easily accessible location, sealed from water and battery fumes.
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c. There shall be a set of battery jumper terminals located next to the battery
electrical main switch and a set located in an easily accessible location in the
engine compartment. Location and mounting of the terminals shall be approved
by the SRTA.
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d. An electrical main switch shall be provided to positively disconnect the battery
from electrical loads when the coach is not in use or in emergency situations.
The switch shall be located in an outside compartment which requires no tool(s)
for access. The switch shall be totally sealed in its own sub-compartment. It is
preferred that the switch handle be non-removable. If the switch handle is
removable, it shall be attached to the switch housing using a small corrosion
proof metal cable. Emergency flasher and radio power circuitry shall be
independent of the main switch. Exact location and details of the switch shall be
approved by the SRTA at the design review.
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14.4 Voltage Drop
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a. There shall be no more than a 3% volt cumulative drop on any circuit, measured
from the initiating source to the appliance load positive and from the appliance
load negative to the reference ground with the load fully operational.
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b. The initiating source for any 24 volt circuit is defined as the 24 volt output positive
post of the series connected batteries.
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c. The initiating source for any 12 volt circuit is defined as the 12 volt output positive
post of the battery equalizer/splitter.
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d. The reference ground is defined as the most negative post of the series
connected batteries.
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e. Measurement equipment and procedure to check voltage drops shall be
approved by the SRTA.
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14.5 Starter
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a. The engine starter shall operate from normal coach voltage and be sized to
provide sufficient torque to turn the engine reliably under all hot or cold engine or