Interconnecting Cables
Interconnecting cable conductor size is dependent upon
the distance between the control, switches, and potential
transformers. Maximum lengths of various cable combi-
nations for No. 18 through No. 12 AWG conductors are
shown in Table 2. The longest combination for the partic-
ular installation will determine the minimum conductor
size. All cables are to be the same conductor size.
Note:
If the control is equipped with the fault block accesso-
ry, see Table 3 for additional cable length limitations.
On the switch end, the cables are wired to connector
plugs provided as standard with the switches. On the S
control end, the cables are wired either directly to termi-
nal blocks in the control or to connector plugs provided
with the Plugs and Receptacles accessory. Figure 9
shows the location of the accessory plugs and recepta-
cles in the bottom of the control cabinet. See the appro-
priate switch installation manual for the location of the
plugs and receptacles on the switch.
Switch Cable
A conductor cable is required between the S control and
each high-voltage switch to operate the switches. This
cable is wired to a socket plug at the switch end and to
either a plug or TB1 at the control end. Pin identification,
and cable OD and maximum conductor size accommo-
dated by the plugs are shown in Figures 10 and 11.
Potential Transformer Cable
A four-conductor cable is required between the S control
and the potential transformers to transmit source voltage
intelligence and to supply operating power for the control.
This cable is wired to a five-pin socket plug or TB2 at the
control end. Pin socket identification, cable OD, and
maximum conductor size accommodated by the plugs
are shown in Figure 12.
Note:
Connectors are not supplied for the transformer end of
the cable.
S260-75-1
13
!
SAFETY
FOR LIFE
Maximum Length of
Cable Wire
Control Cable Combinations (ft.)
Size
VR, VLR, or VRV Switches
TSC Switch
(AWG)
A+B+D or C+B+D
A+B or A+D
or C+B or C+D
18
1450
1250
16
2300
2000
14
3700
3200
12
5900
5050
LOAD
S CONTROL
HV
SW
2
D
C
HV
SW
1
B
A
TABLE 2
Maximum Control Cable Lengths
Figure 9.
Plugs and receptacles accessory.
KEYWAY
PIN F
VIEW A-A
MAX. WIRE SIZE – NO.16 AWG
PIN INSERT CONNECTIONS INTO CONTROL
RUBBER GROMMET
ACCOMMODATES
1/2" TO 5/8" DIA. CABLE
A
A
KEYWAY
SOCKET E
MAX. WIRE SIZE – NO.12 AWG
SOCKET INSERT – CONNECTS INTO CONTROL
RUBBER GROMMET
ACCOMMODATES
3/8" TO 1/2" DIA. CABLE
A
A
Figure 10.
Switch cable plug for VR, VLR, VRV, and TSC.
Figure 12.
PT cable plug.
020079KM
Note: The control cable lengths are not applicable for the C
switch and the PST switch.
KEYWAY
PIN F
VIEW A-A
PIN INSERT CONNECTIONS INTO CONTROL
A
A
PST-6
8, 7, & 19 PIN RECEPTACLES
PST-9
8 & 19 PIN RECEPTACLES
A
F
E
G
D
C
B
A G
F
E
H
D
C
B
8 PIN 7 PIN 19 PIN
L M A
K U N B
C
D
P
V
T
J
R
S
E
F
H
G
Figure 11.
Switch cable plugs for PST-6 and PST-9.
