with expansion chambers for full rating. Cutout shall be mounted on
galvanized steel junction boxes with bolted-on covers, unless indicated
otherwise.
2.1.16
Transformer, Substations and Switchgear
The transformer substations and switchgear shall be as specified in Section
16402 INTERIOR DISTRIBUTION SYSTEM.
2.1.17
Emergency Generator and Automatic Transfer Switch System
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NOTE: Sections UFGS-16410A AUTOMATIC TRANSFER
SWITCH AND BY-PASS/ISOLATION SWITCH, UFGS-16263A,
DIESEL-GENERATOR SET STATIONARY 100-2500 kW, WITH
AUXILIARIES, and UFGS-16264A, DIESEL-GENERATOR SET,
STATIONARY 15-300 kW, STANDBY APPLICATIONS shall be
edited and modified as necessary to suit the
specific airfield or heliport installation.
Airfield or heliport requirements include the
following. Emergency generator sets shall be rated
0.8 power factor lagging, either 4160/2400 or
480/277 volts, 3-phase, 4-wire, grounded wye, 60 Hz.
Installations for OCONUS usually require 50 Hz.
Governor shall provide speed regulation of 5 percent
from no load to full load. Provide manual voltage
control, electromagnetic interference suppression,
batteries, battery charger, and repair parts.
Parallel operation and remote control speed
adjustments are not required. Automatic transfer
switch shall be specified for ratings needed for the
airfield or heliport lighting installation. The
generator and automatic transfer switch system shall
accomplish a complete transfer to the emergency
power supply within 15 seconds of interruption of
the normal power supply for Category I airfields.
Time delay to override momentary normal source
outages to delay all transfer switch and engine
starting signals shall be set at three seconds.
**************************************************************************
The automatic transfer switch shall be in accordance with Section [16410A
AUTOMATIC TRANSFER SWITCH AND BY-PASS/ISOLATION SWITCH] [_____] and as
required by the contract drawings or contracting documents. The emergency
generator shall be in accordance with Section [16263A DIESEL-GENERATOR SET
STATIONARY 100-2500 kW, WITH AUXILIARIES] [16264A, DIESEL-GENERATOR SET,
STATIONARY 15-300 kW, STANDBY APPLICATIONS] [_____] and as required by the
contract drawings or contracting documents.
2.1.18
Circuit Selector Cabinet
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NOTE: Circuit selector cabinets were previously
referred to as distribution boxes and may be
provided to select one of two circuits or to select
any combination of up to four circuits.
**************************************************************************
The circuit selector cabinet shall be FAA AC 150/5345-5, Type L-847, for
SECTION 16526A
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