S&C Instruction Sheet 775-510
11
Figure 7. A typical surge arrester mounting arrangement.
(Optional disconnect and front brackets shown.)
Figure 8. The Scada-Mate SD switch terminal pad. The discon-
nect pad is shown. Do not wire-brush the surfaces.
Plated terminal pad
Figure 9. The sensor terminal pad. Do not wire-brush the
surfaces.
Sensor terminal pad
Installing Surge Arresters
Use the following procedure when installing surge
arresters on a Scada-Mate SD Switching System:
STEP 9.
Install surge arresters (customer furnished), if
applicable, using the mounting provisions
provided. Surge arrester brackets are provided
on the pole-saddle side of the switch and are
optionally available on the front side of the
switch. Each surge arrester bracket has three
9∕16
-inch (14-mm) diameter holes. Mount the surge
arrester using one of the holes and connect the
surge arrester ground to one of the other holes.
When properly installed and connected, the
surge arresters are grounded through the switch
base. A separate ground wire can be run for the
arresters at user discretion. See Figure 7.
Preparing Connector and Terminal Pad
Surfaces
Before installing connectors on the terminal pads, use the
following procedure to prepare their surfaces:
STEP 10.
Do not wire-brush Scada-Mate SD switch
terminal pads.
They are plated, and wire
brushing will scratch the protective coating.
Apply a coating of high-voltage connector grease
to these pads before securing the connectors to
the terminal pads. See Figures 8 and 9.
STEP 11.
Securely tighten the connector using customer-
supplied ½—13 UNC hardware. Typical
tightening torque may vary depending on the
hardware type and material. Check with the
manufacturer for correct torque.
STEP 12.
Prepare the conductors using established
procedures before clamping them in their
respective connectors. Torque S&C connectors
to between 40 and 50 ft-lbs.
CAUTION
DO NOT apply excessive load to the
terminal pads .
The jumper connections should be in line
with and level to the terminal pad bolt holes
before securing the jumper fasteners to the
terminal pad . Large pull-off forces may
misalign the blades with the stationary
contacts or prevent proper closing .
Do not exceed 90 lbs . in line and 30 lbs .
perpendicular to the terminal pad . (IEEE
Standard ANSI C37 .32-1996, Section
8 .8 .2 .2 .)
Misaligned contacts may overheat,
causing arcing and damage to the switch.
Damage to equipment and injury to
operating personnel may result.
Installation
Surge arrester brackets
Surge arrester brackets
