2.7.11
Specific Unit Requirements
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NOTE: Specify devices to be located on a swinging
or interior panel for aisleless switchgear and on
unit or compartment doors for switchgear provided
with interior aisles.
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In addition to the basic circuit breaker unit requirement listed in NEMA SG
6, each individual unit or section shall contain other devices as required
for the application. The following requirements are not to be considered
complete in every detail and miscellaneous equipment and devices necessary
for correct operation, as indicated or specified, shall be provided as
necessary. Protective relays, meters, instruments, and control and
instrument switches, shall be mounted [on a swinging panel located behind
the exterior door of no-aisle switchgear] [on a unit or compartment door].
[Where space is not available for these devices, indicated devices may be
installed on auxiliary compartment doors as shown.] [Devices specified in
paragraph [INCOMING LINE SWITCHING EQUIPMENT] [and paragraph] [SUBSTATION
EQUIPMENT] to be installed in the metal-clad switchgear shall be located
where indicated.]
2.7.11.1
Incoming Line and Transformer Main Secondary Units
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NOTE: Specify "Incoming Lines" for switching
stations and "Transformer Main Secondary" for power
transformers.
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Units shall be coordinated with the [requirements of the serving utility]
[and] [the transformer to be protected] and shall include the following:
a.
[Three] [Six] [_____] current transformers.
b.
c.
[Voltmeter] [Voltmeter, recording type] and a voltmeter switch.
d.
Watthour [demand] meter.
e.
Wattmeter [, recording type].
f.
Varmeter [, recording type].
g.
Duplex watt-varmeter, recording type.
h.
Watt transducer integral with the associated wattmeter or mounted
on the [back of a section door] [interior panel].
i.
VAR transducer integral with the associated varmeter or mounted on
the [back of a section door] [interior panel].
j.
Three overcurrent relays, device 51.
k.
Three directional overcurrent relays, device 67.
l.
Overcurrent relay, device 51 [N] [G] [connected to the associated
SECTION 16311A
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