j.
[_____]
2.5.2.2
Line Tie
**************************************************************************
NOTE: Delete either 86B or 87B relays if not
required.
**************************************************************************
The line tie units shall be rated [as shown] [the same as the incoming line
units], and shall be electrically or mechanically interlocked with other
high-voltage items of equipment as shown. The line tie unit shall be
equipped with control and monitoring system items the same as described for
the incoming line unit. The instrument and relay cabinet shall house the
same equipment listed for the incoming line unit cabinet except [_____].
The cabinet shall also house three bus differential relays, device 87B, and
an auxiliary lockout relay, device 86B.
2.5.2.3
Instrument and Relay Cabinet
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NOTE: The control switch, status lights, metering,
and relaying will be located on the secondary
metal-clad switchgear; additionally, a control
switch, status lights, and a local-remote selector
switch will be mounted at the device. If this
equipment cannot be mounted on the secondary
metal-clad switchgear, then these devices will be
installed in an instrument and relay cabinet
adjacent to the operating mechanism cabinet.
Transformer differential and differential lockout
relays will be located in the metal-clad switchgear.
Where there is no metal-clad switchgear, the
appropriate material from the paragraph will be
included as a part of paragraph SUBSTATION EQUIPMENT.
**************************************************************************
Enclosures shall be provided for housing instruments, relays, and devices
specified. Devices such as instruments, relays, and control and transfer
switches shall be installed in the [metal-clad switchgear lineup where
indicated] [an instrument and relay cabinet]. Enclosures shall comply with
NEMA 250 for Type [3R] [4] [_____], and paragraph CABINETS AND ENCLOSURES.
Rigid supports, conduits, fittings, raceways, troughs, etc., shall be
provided for mounting and connection to the associated equipment. Standard
enclosure equipment shall include the following:
a.
A light connected to a cabinet door-actuated switch, so that the
light is energized only when doors are open.
b.
A heater continuously energized to prevent condensation within the
cabinet over an ambient temperature range of [minus 29] [_____] to
[40] [_____] degrees C [minus 20] [_____] to [104] [_____] degrees
F. The heater and thermostat contact shall be connected to a
cabinet door-actuated switch, so that the heater is de-energized
when the cabinet door or doors are open. High temperature thermal
protection shall be included.
c.
One-pole or two-pole thermal-magnetic molded-case circuit breakers
SECTION 16311A
Page 27
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