Maximum Voltage
[5] [10] [30] [_____]
Deviation with Step
percent of rated
Load Decrease
voltage
Maximum Frequency
[2.5] [5] [_____]
Deviation with Step
percent of rated
Load Decrease
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 second 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 genset
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/designer to
verify that the proposed equipment meets the design
parameters.
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Each engine-generator set shall be provided and installed complete and
totally functional, with all necessary ancillary equipment to include: air
filtration; starting system; generator controls, protection, and isolation;
instrumentation; lubrication; fuel system; cooling system; and engine
exhaust system. Each engine-generator set shall satisfy the requirements
specified in the Engine-Generator Parameter Schedule.
1.3.1
Engine-Generator Parameter Schedule
ENGINE-GENERATOR PARAMETER SCHEDULE
Power Rating
[Prime] [Limited Running Time]
[Emergency Standby] [Industrial]
SECTION 16263A
Page 25
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