Eaton Cutler-Hammer Magnum Digitrip 220+ Instructions Manual page 34

Page 34
3200A
1 1600A
Zone 1
Zone 2
200A
2
Zone 3
3
Figure A.1 Typical Zone Interlocking
Figure A.2 Typical Zone Interlocking Connections with Two Main Breakers (M1, M2) and a Tie Breaker (T)
Courtesy of NationalSwitchgear.com
Main
C
Zone
ZO
0.5 Sec
ZI
1200A
Feeder
C
0.3 Sec
400A
ZO Zone
ZI
Branch
0.1 Sec
100A
C
Zone
ZO
ZI
See Note A4
Notes:
A1: 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.
1
A2: The maximum distance between two farthest breakers
on different zones (from the ZO downstream to ZI upstream
terminals) is 250 feet (76m).
A3: A maximum of 20 breakers may be contained in parallel
in one zone.
A4: Provide a self interlocking jumper (on Zone 3) if
coordination is desired with other downstream breakers
2
not providing the zone interlock feature.
= Common (ungrounded) - B7
C
= Zone Out Output Signal - B9
ZO
to Higher Level Zone
ZI
= Zone In Input Signal
3
from Lower Level Zone
= Fault at Location 2
2
I.L. 70C1037H04
Contact
Contact
- B8 Contact
Legend
Effective 7/1/2003