shall be of the heavy-duty, oil-tight type, rated 600 volts ac, and have a
contact rating designation of A600. Switches shall be provided with
contact blocks shall be provided to make up the electrically separate
contacts required for lead-lag selector switches.]
2.6.10.2
LED Indicating Lights
Red and green LED's shall be furnished where shown on the drawings,
indicating contact "open" and "closed" position. The LED's shall be
accessible and replaceable from the front of the control center through a
finished opening in the compartment door. The LED assemblies shall be of
the heavy duty oiltight, watertight, and dusttight type.
2.6.10.3
Control relays shall be of the electrically operated, magnetically held,
self-reset, open type, suitable for mounting inside the starter
compartments, and shall be [125-volt dc] [120-volt ac]. Contacts shall be
as indicated on the drawings and shall have a contact rating designation of
A600 or N600, as required, in accordance with NEMA ICS 2.
2.6.10.4
Timers shall be pneumatic type. They shall be suitable for mounting inside
the control center and shall be rated 120 volts ac, 60 Hz. Instantaneous
and time delay contacts shall be provided as indicated on the drawings, and
shall have a contact rating designation of A600 or N600, as required, in
accordance with NEMA ICS 2. Means shall be provided for manual adjustment
over a range as indicated on the drawings.
2.6.10.5
Alternators
Alternators 120-volt, 60 Hz, single-phase, open type, suitable for mounting
inside of control center as indicated. Alternators shall automatically
cycle two motor starters in such a manner that No. 1 will lead and No. 2
will lag during the first cycle, and during the second cycle No. 2 will
lead and No. 1 will lag, and the third cycle will repeat the first cycle.
The duration of a cycle will be determined by an [external device]
[adjustable time delay]. Contacts shall have a minimum contact rating
designation of A600 or N600, as required, in accordance with NEMA ICS 2.
2.6.10.6
Elapsed-Time Meters
Hour-indicating time meters shall have 6- digit registers with counter
numbers at least 6 mm 1/4 inch high. White numbers on black backgrounds
shall provide hour indication with the last digit in contrasting colors to
indicate tenths of an hour. The enclosure shall be 90 mm 3-1/2 inches
square and dust resistant. Operating voltage shall be 120 volts ac. They
shall be of the nonreset type.
2.6.11
Feeder Tap Units
Feeder tap units shall be provided as indicated on the drawings.
2.6.12
Metering Section
Metering section shall be provided with instruments as indicated on the
drawings.
SECTION 16403A
Page 28