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Fault Block Shielded Cable
Table 3 shows the maximum distance between the con-
trol and the high-voltage switches for a range of conduc-
tor sizes and fault-block settings. The table is based on
conductor voltage drop and saturation of the current
sensing transformers in the switch. Lower actuating lev-
els and lower multipliers could allow longer lines.
However, the limitation on switch control cable lengths,
Table 2, preclude their use.
Shielded cable is required between the transfer switches
and the S control for operating the fault block accessory.
The shield must be grounded to the equipment housing
at both the switch and control ends. Shield connections
are made at connector plug pin or socket as shown in
Figure 13. This pin mates with the receptacle pin or sock-
et which is grounded in the switch and in the control as
shown in Figures 6 and 8.
Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions
14
TABLE 3
Fault Block Cable Limitations
Max. Distance in Feet
Phase
Between Switch and
Actuating
Con-
S Control
Current
ductor
Level
Size
For X 8
For X 6
For X 4
(Amps)
(AWG)
Multi-
Multi-
Multi-
plier
plier
plier
640
18
600
1000
1800
640
16
950
1600
2900
640
14
1500
2550
4600
640
12
2400
4000
7300
448
18
1100
1700
–
448
16
1800
2700
–
448
14
2800
4300
–
448
12
4500
6850
–
320
18
1800
–
–
320
16
2900
–
–
320
14
4600
–
–
320
12
7300
–
–
Figure 13.
Fault block cable plug.
KEYWAY
SOCKET A
SWITCH END
STRIP JACKET TO EXPOSE SHIELDING
RUBBER GROMMET
ACCOMMODATES
.50 TO .56 DIA. CABLE
A
A
KEYWAY
CONTROL END
PIN G
SOLDER #16 AWG JUMPER WIRE
FROM SHIELD TO PIN G TO
COMPLETE SHIELD CONNECTION
IMPORTANT: Only shielded cable is to be used on fault
block accessory and is mandatory to validate the
Cooper Power Systems warranty. Use of a non-shielded
cable could result in misoperation.