2.2.6.1
Control Devices and Wiring
Manual or automatic control protective or signal devices required for the
specified operation and all control wiring for these controls and devices
shall be provided whether indicated or not. Electrical control devices
shall have minimum current and voltage ratings in accordance with the
requirements of NEMA ICS 2 contact rating designation A 300, as applicable,
unless larger ratings are indicated or are required. Control devices shall
be provided with the number and arrangement of contacts required to perform
the specified control functions. Devices shall be provided with or
installed in NEMA 4X enclosures.
2.2.6.2
Pressure switches shall have a minimum pressure rating of [_____] kPa psi
with set point operating as shown. The switches shall be enclosed in
watertight, [galvanized] [stainless] steel, NEMA 4X housings. The switches
shall be provided with a normally open, normally closed contact having a
minimum rating of 5 amps, 125/250 volts AC.
2.2.6.3
Electronic Limit Switches
The electronic limit switches shall have solid-state, thumbwheel,
programmable limits with a count/revolution range of 0000 to 3599; four
decades of limit programming; set point switch function selection; initial
power supply that provides four AC power levels (plus 5 V, plus 15 V, plus
24 V) from standard 120 or 240 VAC sources; and outputs for read-outs on
two [digital] [analog] displays (one remote digital read-out in the control
room and one at the hydraulic power unit). The operating temperature range
of the electronic limit switches shall be [0] [minus 20] degrees C to plus
65 degrees C. The limit switches shall be located and mounted as shown.
2.2.6.4
Transducer (Electromagnetic Position Sensor)
The transducer shall be single turn, heavy duty, and enclosed in a
water-resistant NEMA 13 enclosure and shall have an operating range of
minus 20 degrees C to plus 85 degrees C.
2.2.6.5
Remote Read-Out [Digital] [Analog] Display
The Contractor shall provide a remote [digital] [analog] display which is
to be connected to the BCD output from the limit switch.
2.2.6.6
Manual Switches
Manually operated switches, including push-button switches, selector
switches, and key-operated switches, shall be heavy-duty, oil-tight type
conforming to the requirements of NEMA ICS 1. Switches shall be the
[momentary contact type with standard operators] [maintained contact type
with [mushroom head] [illuminated button] [latching button]].
2.2.6.7
Relays
Relays used in control circuits shall be industrial magnetic control relays
conforming to NEMA ICS 2 contact rating designation A 300, except where
other ratings are indicated. Relays shall be applied in control circuits
in such a manner that proper control functions shall be obtained regardless
of whether the contacts are overlapping or non-overlapping.
SECTION 15010A
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