GE Industrial Solutions Spectra Series Power Panelboards AMCB6FJ, AMCB3FJ, AMCB2FJ, and AMCB4FJ - Manual (Page 2)

b. Double-branch breakers. Install the circuit breaker
straps beginning with the outermost poles, as
shown in Figures 4 and 5. Slide an antiturn clip
[30] over the square shank of a carriage bolt [20].
Insert the carriage bolt assembly into the front
square hole so that the pin rests on top of the
vertical bus.
Align the square hole in the straps [18 & 19] with
the carriage bolt [20] and slide it against the
vertical bus, so that the pin on the antiturn clip
[30] is inserted into the small hole on the strap, as
shown in Figures 4 and 5.
Secure the complete strap assembly to the vertical
bus with the Belleville washer [21] and nut [22].
Leave the connection finger tight at this time.
Repeat the process on the center-pole straps [23]
and then install the last straps [18 & 19], as shown
in Figures 4 and Figure 5.
2. Install the circuit breaker mounting brackets and
cover supports.
a. Main and single-branch breakers.
Fasten the
breaker mounting bracket [7] to the panel side rail
with thread-forming screws [9]. Attach a cover
support (included in the breaker cover kit) to the
threaded holes in the mounting bracket with the
#10-32 x
1 / 2 " machine screws [14] and lock
washers [15] tightened to 18 in-lb.
Attach the breaker mounting bracket [8] to the
opposite side rail with thread-forming screws [9]
tightened to 30 in-lb. With the mounting tabs on a
cover support oriented outward, slide the lowest
slot on the support onto the breaker mounting
bracket until it snaps into place, as illustrated in
Figure 6.
The cover support can be easily removed by
inserting a screwdriver into the mounting slot on
the underside of the mounting bracket assembly
and gently prying downward, while pushing the
cover support off, as illustrated in Figure 7.
b. Double-branch breakers. Attach the breaker
mounting brackets [24] to the panel side rails with
thread-forming screws [25], tightened to 30 in-lb.
With the mounting tabs on the cover supports
oriented inward, slide the lowest slot on the
supports onto the breaker mounting brackets until
they snap into place.
Cover supports can be easily removed by inserting a
screwdriver into the mounting slot on the
underside of the mounting bracket assembly and
gently prying downward, while pushing the cover
support off.
3. Install the circuit breakers.
a. Main and single-branch breakers. For main breaker
operation, mount the device such that the load- or
OFF -side terminals rest on the straps and the
mounting bracket supports the opposite end of the
breaker housing. For single-branch operation,
position the circuit breaker such that the line- or
ON -side terminals rest on the straps and the
opposite side is supported by the mounting
bracket.
Align the holes in the circuit breaker housing with
the corresponding holes in the mounting bracket.
Secure the breaker to the bracket with the #10-32 x
3
3 / 4 " machine screws [12] and flat washers [13],
tightened to 30 in-lb. Attach the circuit breaker
terminals to the threaded holes in the straps using
the
1 / 4 -20 x 3 / 4 " machine screws [10] and
Belleville washers [11]. Tighten each terminal
connection to 50 in-lb.
NOTE: Straps may require minor adjustments for
proper hole alignment.
b. Double-branch breakers. Position each circuit
breaker such that the line- or ON -side terminals rest
on the straps and the opposite side is supported by
the mounting bracket. Align the holes in each
circuit breaker housing with the corresponding
holes in the mounting bracket. Fasten the breakers
to the brackets with the #10-32 x 3
3 / 4 " machine
screws [28] and flat washers [29], tightened to 30
in-lb. Attach the line-side circuit breaker terminals
to the threaded holes in the straps using the
1 / 4 -20
x 3 / 4 " machine screws [26] and Belleville washers
[27]. Tighten the line-side screws to 50 in-lb.
NOTE: Straps may require minor adjustments for
proper hole alignment.
4. Tighten the bolted connections. Tighten the bolted
strap connections at the main to 65 in-lb. It may be
necessary to remove the adjacent circuit breaker to
allow access to the bolted connections at the vertical
bus.
5. Two-pole configurations. For phase-balancing
purposes, single-phase panels, and dc applications, see
Table 3 for the two-pole breaker mounting
configurations available with the listed strap kits.
Strap Kit
Catalog No.
A-Phase
Location
B-Phase
Location
C-Phase
Location
X X
X* X* AMCB4FJ
X X
X X
X* X* AMCB2FJ
X X
* Use for single-phase panels and dc applications.
Table 3. Possible phase connection combinations with strap kits.
6. Tape unused contacts. Apply multiple wrappings of
insulation to unused strap contact surfaces, as
illustrated in Figure 8. A UL-recognized 105° C
thermoplastic tape (OANZ2, Permacel P-30-105, or
3M 66R) is required. Overlap greater than one-half of
each preceding turn, as shown, to achieve a minimum
tape thickness of 0.028 inch. This insulation thickness
requires two complete layers of overlapping turns.