Before Starting
The bypass accessory allows the interrupter of
the Trans-Rupter II to be “bypassed” allowing
operation of the Trans-Rupter II and testing
of the associated relays without interrupting
service.
The Trans-Rupter II Transformer Protector
has four sets of upper and two sets of lower
terminal pad mounting bosses. (See “Terminal
Pad and Conductor Connections” on page 34
for more details.) The upper terminal pad of
each pole-unit can be mounted in one of four
positions located 90° apart. The lower terminal
pad of each pole-unit can be mounted in one of
four positions located 180° apart. Determine the
appropriate terminal pad locations before pro-
ceeding. The bypass accessory must be attached
to the terminal pad mounting bosses so that the
bypass blade swings at a 90° angle away from
the pole-unit and away from other pole-units.
To avoid damage to the bypass blade the
bypass should be installed after the pole-unit
is secured to its mounting structure but before
conductor connections are made. If retrofitting
the blade to an existing Trans-Rupter II Trans-
former Protector, make sure the Trans-Rupter II
is de-energized and grounded at all six terminals
before beginning. Remove the existing conduc-
tors, terminal pads and associated hardware.
Step 54
Thoroughly clean the surface of the
Trans-Rupter II casting and the surface of the
bypass accessory terminal pads using a soft
cloth. Immediately apply a liberal coating of
Burndy Penetrox
®
A or other suitable aluminum
connector compound to the clean surfaces.
Step 55
Using the two
Z\x
–
13
3
1 hex-head stainless-steel
cap screws and
Z\x
-inch stainless-steel lock
washers furnished, attach the upper bypass
contact to the appropriate set of tapped holes.
The mounting bracket uses the same holes that
the terminal pad would normally occupy. The
mounting bracket should be perpendicular to
the pole-unit as shown in Figure 61. Tighten to
a torque of 40 to 45 ft.-lbs.
Ç
CAUTION
Never exceed the recommended torque limit .
The pole-unit base is pressurized and
damage to the pole-unit may occur.
Installing Optional Bypass Accessory
Figure 62. Attach the upper bypass contact to the pole-unit.
Upper bypass contact
Z\x
–
13
3
1 hex-head
stainless-steel cap screws
and lockwashers
Figure 63. Attach lower bypass blade assembly. Front view.
Bypass blade assembly
Spacer
Z\x
–
13
3
1 hex-head stainless-steel
cap screws and lockwashers
Figure 61. Attach lower bypass blade assembly. Rear view.
Z\x
–
13
3
1 hex-head
stainless-steel cap
screws and
lockwashers
Blade
stop
Spacer between
pole-unit and blade
assembly
Terminal
pad
Hinge support
hardware
32
S&C Instruction Sheet 731-502
