Eaton Cutler-Hammer Digitrip 520M Instructions Manual page 14

Page 14
Figure 2.8 Zero Sequence Sensing Scheme for 3200A Frame
Figure 2.9 Multiple Source/Multiple Ground Scheme
Courtesy of NationalSwitchgear.com
I /2
N
G
I /2
G
B 5
i /2
g
B 4
M 1
i /2
G
R 5
B 5
i /2 B 4
g
R 5
Notes:
B reaker M 2 trips since this is the only breaker seeing the I
No jum per on B -6, B -7 term inals - all breakers are program m ed for standard Residual Ground Fault
protection.
A UX CTs not show n. W iring needed at system level is shown as a dotted line.
Capital letters repre se nt prim ary cu rren t. L ow ercase letters represent second ary current.
Th e three breakers (M 1, M 2 , and T) m ust all have th e sam e breaker/sensor rating .
I /2
N
G
I /2
G
i /2
i
g
g
B 5
I
G
i /2
g
B 4
M 2
T
R 5
N eutral S ensors W ired
in a Loop C on figuration
G round Fault
I
G
fault via elem ent R .
G 5
I.L. 70C1037H02
Internal
Digitrip
S ensor
i
g
Effective 8/13/99