Page
1 6
I
3200 A
)
1 600 A
)
5
1
N
'
"'
)
Q)
200 A
c: 2
0
N
+-
"'
Q)
c:
0
N
3
Main
0.5 Sec
1200 A
Feeder
0.3 Sec
400 A
Branch
0 . 1 Sec
1 00 A
Z1
Z2
Z3
Fig.
A
1 Typical Zone Interlocking (Ground Fault Pro
tection)
F 1 1
0 . 1 Sec
M 1
0.5 Sec
1 N4004
F 1 2
D1
0.1 Sec
0.3 Sec
Notes: A1 :
A2:
I.L. 29-8858
Wiring to be twisted pair of AWG No. 1 4
to AWG No. 20.
Route Zone Interlocking wiring sepa
rate from power conductors.
DO NOT GROUN D any Zone Interlock
Wiring.
The maximum distance between first
and last zone is 250 feet (1 1 0 m).
A3: A Maximum of 20 breakers may be con
nected in parallel in one Zone.
M2
0.5 Sec
F21
F22
0.1 Sec
0.1 Sec
Legend
; Common (Ungrounded)
; Short Delay Output Signal
to Higher Level Zone
; Short Delay Input Signal
from Lower Level Zone
= Ground Output Signal
to Higher Level Zone
= Ground Input Signal
from Lower Level Zone
/>
ault at Location 2
2
F23
0.1 Sec
Fig. A.2 Typical Zone Interlocking Connections with Two Main Breakers (M1, M2) and a Tie Breaker (T) (Short Delay
Protection)
IF !y-•N
Effective May 1 997
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