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Effective 10/2004
Page 44
I.L. 70C1036H05
Figure A.1 Typical Zone Interlocking
Figure A.2 Typical Zone Interlocking Connections with Two Main Circuit Breakers (M1, M2) and a Tie Circuit Breaker (T)
1600A
Main
Zone 1
Zone 2
Zone 3
2
200A
1
800A
3
Branch
0.3 Sec
400A
0.1 Sec
100A
0.5 Sec
1200A
Feeder
Zone
1
Zone
2
Zone
3
C
C
C
ZO
ZO
ZO
ZI
ZI
ZI
Notes:
A1:
A2:
A3:
A4:
Wiring to be twisted pair of AWG #14 to #20. Route
Zone Interlocking wiring separate from power conductors.
DO NOT GROUND any Zone Interlocking wiring.
The maximum distance between two farthest circuit breakers
on different zones (from the ZO downstream to ZI upstream
terminals) is 250 feet (76m).
A maximum of 20 breakers may be contained in parallel
in one zone.
Provide a self interlocking jumper (on Zone 3) if
coordination is desired with other downstream circuit breakers.
2
C
ZO
ZI
Legend
= Common (ungrounded) - B7 Contact
= Zone Out Output Signal - B9 Contact
to Higher Level Zone
= Zone In Input Signal - B8 Contact
from Lower Level Zone
= Fault at Location 2
See Note A4
F23
C
ZO
ZI
F22
C
ZO
ZI
T
0.5 Sec
0.5 Sec
0.1 Sec
0.1 Sec
0.1 Sec
0.3 Sec
0.1 Sec
0.1 Sec
C
ZO
ZI
F21
C
ZO
ZI
F12
1N4004
D1
C
ZO
ZI
M2
C
ZO
ZI
M1
C
ZO
ZI
F11
C
ZO
ZI