Page 1 6
§ 1
N
t
"'
"'
c: 2
0
N
"'
c:
0
I
3200 A
)
1 600 A
)
200 A
)
N
3
M a i n
Z1
0.5 Sec
1 200 A
F
ee
d
e
r
Z2
0.3 Sec
400 A
Branch
0. 1 Sec
Z3
1 00 A
Fig. A. 1 Typical Zone Interlocking (Ground Fault Pro
tection)
M 1
0. 1 Sec
0.1 Sec
I.L. 29·8858
Notes: A1 : Wiring to be twisted pair of AWG No. 1 4
to AWG No. 20.
M2
Route Zone Interlocking wiring sepa
rate from power conductors.
DO N OT GROUND any Zone Interlock
Wiring.
A2: 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.
Legend
= Com mon (Ungrounded)
= Short Delay Output Signal
to Higher Level Zone
= Short Delay I nput Signal
from Lower Level Zone
= Ground Output Signal
to Higher Level Zone
= Ground Input Signal
from Lower Level Zone
/c
ault at Location
2
2
0.5 Sec
F21
F22
F23
0.1 Sec
0.1 Sec
0.1 Sec
Fig. A.2 Typical Zone Interlocking Connections with Two Main Breakers (M1, M2) and a Tie Breaker (T) (Short Delay
Protection)
Effective May 1 997
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