Load
Transient Recovery Time
[_____] seconds
with Step Load Decrease
(Voltage)
Transient Recovery Time
[_____] seconds
with Step Load Decrease
Maximum Voltage Deviation
[5] [10] [30]
with Step Load Decrease
[_____] percent of
rated voltage
Maximum Frequency Deviation
[2.5] [5] [_____]
with Step load Decrease
percent of rated
frequency
Maximum Time to Start and Assume Load. Choose 10
seconds for emergency-standby applications (critical
for life safety), NFPA 70 requires that standby
engine-generator sets used in emergency applications
start and assume load in 10 seconds. Most
commercially available engine generator sets are
capable of starting and assuming load within 10
seconds, however, a default value of 20 seconds is
non-restrictive and provides a reasonable maximum
value for non-critical applications.
Temperature Management. The designer is responsible
for temperature control in the space occupied by the
engine generator set. However, because the genset
supplier normally provides the engine cooling system
(and block heaters where required), the designer
must provide ambient conditions under which the
engine generator must operate, so that the supplier
can size the equipment. Typically, high temperature
provides the most restrictive condition, therefore
the designer must design air-flow of adequate
temperature and sufficient quantity to maintain the
temperature of the generator and engine space within
acceptable limits. This requires the designer to
consult manufacturers literature and/or
representatives to determine the nominal heat
rejection to the surroundings at rated capacity
(from all heat sources) to determine the required
cooling or air flow through the engine generator set
room or enclosure. In turn the manufacturer must
submit the specific operating data in order for the
Contracting Officer and designers to verify that the
proposed equipment meets the design parameters.
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ENGINE GENERATOR PARAMETER SCHEDULE
Service Load
[_____] [kVA] [kW]
Power Factor
[0.8] [_____] lagging
SECTION 16264A
Page 21
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