Windsor-Severence Fire Protection District
Heavy Rescue
Production Specification
SVI #774 Page 16 of 126 April 19, 2010
UL 120/240 VAC CERTIFICATION
The 120/240 volt electrical system shall be tested and certified by Underwriters Laboratories, to perform as listed below;
The prime mover shall be started from a cold start condition, and the unloaded voltage and frequency shall be recorded.
The line voltage electrical system shall be loaded to at least 100 % of the continuous rated wattage stated on the power
source specification label. Testing with a resistive load bank shall be permitted.
The power source shall be operated in the manner specified by the apparatus manufacturer as documented on instruction
plates or in operation manuals. The power source shall be operated at a minimum of 100 % of the continuous rated
wattage as stated on the power source specification label for a minimum of 2 hours.
The load shall be adjusted to maintain the output wattage at or above the continuous rated wattage during the entire 2-
hour test.
The following conditions shall be recorded at least every 1/2 hour during the test:
1. The power source output voltage, frequency, and amperes
2. The prime mover’s oil pressure, water temperature, and transmission temperature, if applicable
3. The power source hydraulic fluid temperature, if applicable
4. The ambient temperature and power source air inlet temperature
The following conditions shall be recorded once during the test for power sources driven by dedicated auxiliary internal
combustion engines:
1. Altitude
2. Barometric pressure
3. Relative humidity
If the generator is driven by the chassis engine and the generator allows for operation at variable speeds, the chassis
engine speed shall be reduced to the lowest rpm allowed for generator operation and the voltage and frequency shall be
recorded.
The load shall be removed, and the unloaded voltage and frequency shall be recorded.
Voltage shall be maintained within ±10 % of the voltage stated on the power source specification label during the entire
test. Frequency shall be maintained within ±3 Hz of the frequency stated on the power source specification label during
the entire test.
The total continuous electrical loads, excluding those loads associated with the equipment defined in NFPA
22.15.7.3.11.2, shall be applied during the testing unless an auxiliary engine drives the power source.
If the apparatus is equipped with a fire pump, the 2-hour certification test of the power source shall be completed with the
fire pump pumping at 100 % capacity at 150 psi (1000 kPa) net pump pressure. The test shall be permitted to be run
concurrently with the pump certification test.
DOCUMENTATION
The manufacturer shall deliver the following with the fire apparatus:
The results of each test shall be recorded on an appropriate form and provided with the delivery of the fire apparatus.
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