GE Industrial Solutions Spectra Series Power Panelboards AMCB4EY and AMCB6EY - Manual (Page 3)

5. Install the isolator and upper mounting brackets.
Align the free ends of the B-phase isolator [11] with
the corresponding #8 threaded holes on the top face
of the lower mounting brackets, as shown in Figure 3.
Place the upper mounting brackets [9] on top of the
isolator ends and align them with the holes, as shown
in Figure 1. Secure the resulting assembly with the #8-
32 screws with lockwashers [10], leaving the screws
fingertight. Slide the brackets to their outermost
positions.
6. Install the circuit breakers. Position the breakers so
that the line- or ON -side terminals rest on the straps.
Fold the isolator flaps upward and insert them into
the opposing grooves in the breaker housing between
the phases, as shown in Figure 4. Secure the captive
screws in the breaker terminals to the corresponding
threaded holes in the straps and tighten to 35 in-lb.
(The straps may require minor adjustments to obtain
proper hole alignment.) For each breaker, slide the
upper breaker mounting bracket until the steel flange
on the underside of the breaker housing is fully
engaged with the toothed section of the bracket, then
tighten the bracket mounting screws to 18 in-lb.
7. Tighten the bolted connections. Tighten the strap
connections at the vertical bus to 65 in-lb. It may be
necessary to remove adjacent circuit breaker modules
to obtain access to the bolted connections at the
vertical bus.
Figure 3. Installing the B-phase isolator.
Figure 4. Installing the breaker with the B-phase isolator.