GE AK-15 - Page 26

SECTION
8
TESTING
AND
TROUBLESHOOTING
Table
8
-
1
.
Resistance
Values
Frame
Size
Resistance
in
Ohms
CT
Rating
7
-
15
150
AK
-
15
FALSE
TRIPPING
BREAKERS
EQUIPPED
WITH
GROUND
FAULT
(
CONT
’
D
)
225
12
-
20
225
AK
-
25
AKU
-
25
12
-
20
40
-
50
Step
4
.
On
ground
fault
breakers
serving
four
-
wire
loads
,
check
that
the
neutral
sensor
is
properly
connected
.
See
cabling
diagram
Fig
.
8
-
1
.
In
particular
,
the
fol
-
lowing
:
600
AKR
-
30
S
AKRU
-
30
S
150
6
-
14
400
21
-
25
59
-
70
800
Verify
that
the
neutral
sensor
has
the
same
rat
-
ing
and
tap
setting
as
the
phase
sensors
.
Check
continuity
between
the
neutral
sensor
and
its
equipment
-
mounted
secondary
discon
-
nect
block
.
Also
check
for
continuity
from
the
breaker
-
mounted
neutral
secondary
disconnect
block
through
to
the
female
harness
connector
.
If
the
breaker
’
s
lower
studs
connect
to
the
sup
-
ply
source
,
then
the
neutral
sensor
must
have
its
load
end
connected
to
the
source
.
See
Fig
.
8
-
1
.
Make
sure
that
the
neutral
conductor
is
earning
only
that
neutral
current
associated
with
the
breaker
’
s
load
current
(
neutral
not
shared
with
other
loads
.
)
A
.
B
.
C
.
D
.
Step
5
.
If
the
preceding
steps
fail
to
identify
the
problem
,
then
measure
the
sensor
resistances
.
Since
the
phase
and
neutral
sensors
are
electrically
identical
,
their
resistance
should
closely
agree
.
)
;
;
26
Courtesy of NationalSwitchgear.com