GE Industrial Solutions Spectra Series Power Panelboards AMCB2KM and AMCB3KM - Manual

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Spectra Series™ Power Panelboards
Bolt-On Circuit Breaker Kits
Application
This instructions applies to bolt-on circuit breaker kits
with catalog numbers AMCB3KM and AMCB2KM.
For use with circuit breaker types SKH, SKL, SKP, TKM,
and THKM.
For use with circuit breaker cover kit AFP6SKS.
Installation
WARNING: Danger of electrical shock or injury.
Turn OFF power ahead of the panelboard or
switchboard before working inside the
equipment or removing any component
.
Equipment is to be installed and maintained by
properly trained and qualified personnel only.
In the following instructions, numbers in brackets in the
text and figures refer to the items in Table 1.
1. Confirm the contents of the kit. These kits are used to
install Spectra K-frame main circuit breakers into
Spectra APNB bolt-on–style interiors. The parts
included in these kits are listed in Table 1.
Item Description Qty. in
AMCB2KM
Qty. in
AMCB3KM
1 A pole strap assembly 1 1
2 Carriage bolt, 1 / 4 -20 x 1 1 / 2 " 4 6
3 Conical spring washer, 1 / 4 " 4 6
4 Nut, 1 / 4 -20 4 6
5 B pole strap assembly 1 1
6 C pole strap assembly 1 1
7 Breaker mounting bracket 2 2
8 Thread-forming screw 4 4
9 Conical spring washer, 3 / 8 " 2 3
10 Nut, 3 / 8 -16 2 3
11 Screw, 1 / 4 -20 x 1 1 / 4 " 4 4
12 Flat washer, 1 / 4 " 4 4
Table 1. Parts included in kits AMCB2KM and AMCB3KM.
2. Locate the side of the interior with a 2.75-inch
reference distance. The circuit breaker straps are
mounted on the side of the panel interior bus at
which the distance from the nearest vertical bus face
to the inner face of the bus-support rail is 2.75 inches,
as indicated in Figure 2.
3. Install the circuit breaker straps. For three-phase
applications (kit AMCB3KM), align the strap
assemblies [1, 5, 6] with the corresponding holes in
the vertical bus, as shown in Figure 1. Fasten each
strap assembly loosely to the vertical bus with two
carriage bolts [2], conical washers [3], and nuts [4].
For single-phase panels, dc applications, and phase-
balancing purposes (kit AMCB2KM), Table 2 lists the
possible configurations. Align the appropriate strap
assemblies [1, 5, 6] with the corresponding holes in
the vertical bus, as shown in Figure 1. Fasten each
strap assembly loosely to the vertical bus with two
carriage bolts [2], conical washers [3], and nuts [4].
A Phase B Phase C Phase
X X
X* X*
X X
* Use for single-phase panels and dc
applications.
Table 2. Possible pole configurations with kit AMCB2KM.
4. Install the breaker mounting brackets. Attach the
breaker mounting brackets [7] to the panel side rails
with two thread-forming screws [8] each. Tighten the
screws to 35 in-lb.
5. Install the circuit breakers. Position the main circuit
breaker so that the strap assembly bolts extend
through the holes in the load- or
OFF -side terminals
and the breaker base is supported by the mounting
brackets. Align the holes in the breaker base with the
holes in the mounting brackets. Secure the breaker to
the brackets with the machine screws [11] and flat
washers [12], tightened to 50 in-lb. Secure the load-
side breaker terminals to the straps with conical
washers [9] and nuts [10]. Tighten the connections to
275 in-lb. Note that the straps may require minor
adjustments for proper hole alignment.
6. Tighten the strap connections. Tighten the bolted
strap connections at the vertical bus to 65 in-lb. It may
be necessary to remove adjacent circuit breaker
modules to allow access to the bolted connections at
the vertical bus.
DEH061 Installation Instructions R02