The starting system for [standby engine generator sets used in emergency
applications shall be in accordance with NFPA 99 and NFPA 110and as
follows.] [engine generator sets used in non-emergency applications shall
be as follows.]
2.11.1
Controls
An engine control switch shall be provided with functions including:
run/start(manual), off/reset, and, automatic mode. Start-stop logic shall
be provided for adjustable cycle cranking and cooldown operation. The
logic shall be arranged for [manual starting] [and] [fully automatic
starting in accordance with paragraph AUTOMATIC ENGINE-GENERATOR-SET SYSTEM
OPERATION]. Electrical starting systems shall be provided with an
adjustable cranking limit device to limit cranking periods from 1 second up
to the maximum duration.
2.11.2
Capacity
The starting system shall be of sufficient capacity, at the maximum
[outdoor] [indoor] summer temperature specified to crank the engine without
damage or overheating. The system shall be capable of providing a minimum
of three cranking periods with 15 second intervals between cranks. Each
cranking period shall have a maximum duration of 15 seconds.
2.11.3
Electrical Starting
Manufacturers recommended dc system, utilizing a negative circuit ground.
2.11.3.1
Battery
**************************************************************************
NOTE: Select nickel-cadmium only when the battery
temperature cannot be maintained above minus 6
degrees C (22 degrees F).
**************************************************************************
A starting battery system shall be provided and shall include the battery,
battery rack, intercell connectors, spacers, automatic battery charger with
overcurrent protection, metering and relaying. The battery shall be in
accordance with SAE J537. Critical system components (rack, protection,
etc.) shall be sized to withstand the seismic acceleration forces
specified. The battery shall be [lead-acid] [nickel-cadmium], with
sufficient capacity, at the minimum [outdoor] [indoor] and maximum
[outdoor] [indoor] temperature specified, to provide the specified cranking
periods. Valve-regulated lead-acid batteries are not acceptable.
2.11.3.2
Battery Charger
A current-limiting battery charger, conforming to UL 1236, shall be
provided and shall automatically recharge the batteries. The charger shall
be capable of an equalize-charging rate [for recharging fully depleted
batteries within [24] [_____] hours] [which is manually adjustable in a
continuous range] and a floating charge rate for maintaining the batteries
at fully charged condition. An ammeter shall be provided to indicate
charging rate. A voltmeter shall be provided to indicate charging voltage.
A timer shall be provided for the equalize-charging-rate setting. A
battery is considered to be fully depleted when the output voltage falls to
a value which will not operate the engine generator set and its components.
SECTION 16263A
Page 49
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