GE MicroVersaTrip Plus - Page 26

SECTION
6
TESTING
AND
TROUBLESHOOTING
Table
6
-
1
.
Resistance
Values
Ampere
CT
Rating
FALSE
TRIPPING
BREAKERS
EQUIPPED
WITH
GROUND
FAULT
(
CONT
’
D
)
Resistance
in
Ohms
Breaker
14
-
18
225
A
KB
Step
4
.
On
ground
fault
breakers
serving
four
-
wire
loads
,
check
that
the neutral
sensor
is
properly
con
-
nected
.
See
cabling diagram
Fig
.
50
.
In
particular
,
the
following
:
Verify
that
the neutral
sensor
has the
same
rating
and
tap
setting
as
the
phase
sensors
.
Check
continuity
between the neutral
sensor
and its
equipment
-
mounted
secondary
disconnect
block
.
Also check
for
continuity
from
the breaker
-
mounted neutral
secondary
disconnect
block
through
to
the
female
har
-
ness
connector
.
If
the breaker
’
s
lower studs
connect to
the
supply
source
,
then the neutral
sensor
must
have its load end connected
to
the
source
.
See
Fig
.
50
.
Make
sure
that
the
neutral
conductor
is
carry
-
ing
only
that
neutral
current
associated with
the
breaker
’
s
load
current
(
neutral
not
shared
with
other
loads
.
)
40
-
50
600
A
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
identi
-
cal
,
their
resistance
should
closely
agree
.
$
26
Courtesy of NationalSwitchgear.com