Advertisement
External A ccessories
N eutral Sensing Transformer
Important
The SB series of electronic trip c i rcuit breakers equipped
with g round fault protection may be used i n the Residual
or G round Return mod es . When used in the Residual
mode the orientation of the neutral sensing transformer
is important for proper operation . See i l lustrations below
for proper orientation of the neutral sensor for Residual
mode Ground Fault. Orientation of the neutral sensor is
not requ i red when used in the G round Return mode of
Ground Fault.
Grounding
Electrode - ,
Bonding Jumper
LT1 1
LT1 2
Standard Connection
LT1 1
Neutral Sensing
Transformer
LT1 2
(terminal face)
Reverse Connection
'IF ':J - � J.. " >7.
.:..>
1 7 °
,;Lff
6
8
A
B
A
B
5Z
·-
3 .2- )
�· "'
><
. -
Bonding Jumper
Grounding
El e ctrode
Installation of neutral transformer
Terminal Connections
If secondary d i sconnects or terminal block has been fac
tory mounted and the transformer has been properly ori
ented and mounte d , connect transformer termi nal X1 to
LT1 1
and X2 to LT1 2 using # 1 8 AWG stranded copper wire.
If left top secondary disconnects or termi nal blocks are field
added , user must remove the c i rcuit breaker cover follow
ing instructions on page
35
L T1 1
wires marked
and LT1 2 . Properly connect these wires
to the secondary d i sconnect or terminal block terminals
T1 1
L
L
and
T 1 2.
Following instructions steps 1 9 and 20 on page 42, replace
the cover being careful not to pinch the wire leads .
Route wires in channel
under me t al plates as
shown.
.2 6
-t-
3
! Go
·+-
7
+-
c
1 :2..
I t
N
8
+
J s·
and
36.
Locate the two grou nd
Wire posi t ions
and
marked on back.
#8
# 1 5
L i t (
.X,
L T t ;L
\
·-
-
- )( l..
Advertisement
