2.7.11.3
Bus Tie Unit
[The unit shall be electrically interlocked with [incoming line]
[transformer main secondary] units as indicated.] [The unit shall be
provided with [_____].]
2.7.11.4
Feeder Units
Units shall be provided for the protection of outgoing feeder circuits and
shall include the following:
a.
[Three] [Six] [Nine] current transformers.
[One ground sensor
current transformer.]
b.
c.
Three overcurrent relays, device [50] [51].
d.
Ground overcurrent relay, device [50GS] [50N].
e.
f.
An automatic-reclosing relay, device 79.
g.
[Single] [Three] phase secondary potential test blocks with
associated test devices, quantity as shown.
h.
[Single] [Three] phase secondary current test blocks with
associated test devices, quantity as shown.
i.
[_____].
2.7.12
2.7.12.1
Space Heating and Ventilation
Continuously-energized space heaters (with high-temperature thermal
protection) shall be installed in each switchgear unit and auxiliary
compartment in accordance with the manufacturer's standard practice and
shall be sized to prevent condensation over an ambient temperature range of
[minus 29] [_____] to [40] [_____] degrees C [minus 20] [_____] to [104]
[_____] degrees F. Aisle ventilation fans shall be provided where
indicated and shall be sized to provide at least 10 air changes per hour.
Fans shall be wired to three-way switches located at each end of the
switchgear aisle and adjacent to aisle lighting switches. In addition,
fans shall be thermostatically controlled to turn fans on when interior
temperatures exceed 40 degrees C 104 degrees F.
2.7.12.2
Aisle Lighting
Fluorescent luminaires shall be a manufacturer's standard fixture equipped
with a cold-weather ballast, and installed in the switchgear aisle to
provide a maintained lighting intensity level of 538.2 lux (50 footcandles)
50 footcandles at floor level in the aisle and on faces of units and
compartments. Luminaires shall be wired to three-way switches located at
each end of the switchgear aisle.
SECTION 16311A
Page 53
Previous Page
