16 S&C Instruction Sheet 663-500
Installation
STEP 8.
Refer to the applicable wiring diagram and
make the appropriate connections from the
current sensors (with polarity marks on top) to
the terminal blocks. Then, attach each current
sensor to its associated high-voltage cable as
follows:
(a) Remove the ¼—20 gap nut on the current sensor.
With polarity marks on top, open the current
sensor and place it around the appropriate high-
voltage cable. Then, replace and securely tighten
the gap nut.
(b) Secure the current sensor to the high-voltage
cable at a point below the cable terminator or
stress cone using the plastic wire ties furnished.
See Figure 10. The current sensor may be placed
against the cable grounded concentric neutral
and the concentric neutral must be brought back
through the sensor or it may be placed against
the cable semiconducting jacket and the
terminator drain wire must be brought through
the sensor.
Note:
The terminal blocks furnished with the optional
auxiliary switches (catalog number suffix “-C9” or “-C10”),
optional
Remote Indication
feature (catalog number
suffix “-.Y4”), or optional
Supervisory Control
feature
(catalog number suffix “-Y6”) are also located in the
terminal-block compartments. Refer to the applicable
wiring diagram and make the connections as required.
STEP 9.
Connect the cable concentric-neutral ground
wires and ground pads inside the pad-mounted
gear enclosure to the system ground facility in
accordance with the user’s standard grounding
practice. Use the equivalent of 4/0 copper cable
(or cable sized in accordance with the user’s
standard practice) in either a single or multiple
connection to realize the maximum momentary
rating of the gear. For a multiple connection,
cables smaller than 1/0 copper or equivalent
should not be used.
Figure 10. The typical method for attaching an S&C Current Sensor to high-voltage cable.
Terminator drain
wire
must be
brought through
the sensor
Conductor concentric
neutral
must be brought
back through the sensor
Sensor above the cable
grounded concentric neutral
Sensor around the cable
grounded concentric neutral
Output terminals
(not visible)
S&C Current
Sensor
¼–20 gap nut
Wire ties
Lead wires
