Trident Emergency Products, LLC
2940 Turnpike Drive | Suite #9 | Hatboro, PA USA
215-293-0700 Fax: 215-293-0701
© 2017 Trident Emergency Products, LLC. All rights reserved.
Upgrade to AirPrime™
Trident’s AirPrime™ series of air powered fire pump
primers offer the following advantages…
f Automatic and manual versions
f Automatic version ensures constant
f Optional lift gauge indicates feet of lift
f Single or multiple inlet priming
f Vacuum created with No Moving Parts
f Fast, easy installation
f Utilizes air pressure from the air brake
f Installs on any fire pump with an air
brake equipped chassis
f Weighs only 8-1/2 pounds and requires
f No high amp draw on the chassis
f Lowest noise level in the industry
f No water lines to pump panel, great for
cold weather environments
system, the accuracy of the final foam solution is extremely
important. For foam solution that is less than one percent, the
accuracy must be between -01 and + 40 percent; for foam greater than one percent, the accuracy range is -01 to + 30 percent.
Chapter 21, Compressed-Air
Foam Systems (CAFS)
Compressed-air foam systems combine air under pressure
with a foam concentrate and water mix to create the finished
Most of these modern systems automatically regulate the
foam-proportioning system and balance the air pressure to the
water pressure. The user has the ability to adjust from a light
fluffy foam to a wet, blanketing mixture.
A CAFS air compressor with relief valve is required as part
of the system. The system must provide a means of mixing air
and foam solution that provides a homogenous mixing, resulting in the finished compressed-air foam.
When specifying a CAFS, specify the discharges requiring
foam and the type of wet/dry control.
Chapter 22, Line Voltage Electrical Systems
Line voltage electrical systems refer to power sources pro-
ducing up to 275 volts and associated equipment provided as a
fixed installation on the fire apparatus. Some of the many ways
of producing this current are direct-drive power take-off (PTO)
generator, hydraulically driven generator, auxiliary engine-driv-
en (gasoline and diesel) generators, and belt-driven generators.
The power source must continuously produce its rated voltage
+/ – 10 percent and if alternating current at 60 Hz + / – 3 Hz.
If the power source is less than three kilowatts (k W, or 3,000
watts), a power activation light is required. From three k W to less
than eight k W, a voltmeter is required; eight k W or more requires
a voltmeter, a current indicator for each leg, a frequency meter in
Hz, and an hour meter.
Overcurrent protection in the form of circuit breakers must
be provided for each branch circuit. If the power source is eight
k W or larger or there are more than six branch circuits, a main
circuit breaker is required. Ground fault circuit interrupters
(GFI breakers) can be specified but are only required on special
service apparatus that is equipped with a lavatory where the
receptacle is within six feet of a sink, toilet, shower, or tub.
The apparatus can be equipped with a shore line connection
that powers line voltage equipment when the vehicle is station-
ary. If certain outlets or equipment needs to be powered from
either the shore line or the generator, a transfer switch that
isolates one power source from the other will be required.
Line voltage receptacles can be located at any number of
places on the apparatus for powering extension cords or radio
chargers, meters, or other rechargeable portable equipment.
Exterior outlets must be suitable for wet locations and must
be mounted not less than 24 inches from the ground. Outlets mounted in the cab or compartments are considered dry
locations. Be sure to specify the correct plug configuration for
outlets. The NFPA 1901 Annex has drawings and descriptions
of the configurations and ratings of outlets and plugs.
Cord reels are extremely handy for powering electrical accessories such as fans and portable lighting being used away
from the apparatus. The minimum cord size for use on reels
is 12 gauge; however, because of voltage drop in long lengths
of cord, I usually specify 10 gauge. A reel can support either a
single 120-volt circuit (three-wire cord) or 240 volts (four-wire)
for equipment such as fans. The cord termination can be either
a receptacle that might plug into a distribution box or a box
permanently attached to the cord. A junction box must be listed for use in wet locations, have a visible light when powered,
and have a strain relief on the cord. Some purchasers specify
a variety of receptacles in the junction box to add versatility.
For example, one 240-volt and two 120-volt twist locks and one
120-volt household duplex receptacle can all be powered from a
single four-wire cord.
Many apparatus with generators also have one or more light
towers. Requirements for light towers include being raised in less
than two minutes, being able to withstand a 50 mile-per-hour
wind load, a secondary means of lowering the tower in case of a
failure of the main system, automatic illumination of the operating envelope, and having the tower wired to a hazard warning
light in the cab.
The apparatus line-voltage power source must be tested and
certified to be able to produce 100 percent of its rated wattage
continuously for two hours. If the generator is mounted on an
apparatus with a fire pump, it must meet this requirement
while the pump is pumping at 100 percent capacity 150 psi