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INSTALLATION Page 13
MOUNTING THE CIRCUIT BREAKER CELL
The circuit breaker cell is designed to mount to
the floor or shelf of the installation compartment.
The floor or shelf to which the cell is mounted
should be flat and level within ± 0.5 mm (± 0.02
in.). If there are any noticeable gaps between
the cell base and the mounting surface, fill them
in using flat washers as spacers.
Fasten the cell using four (4) M8 hex head bolts
(Fig. 11). The tightening torque should be 120-
150 kgf-cm (9-11 ft-lb).
MAIN CIRCUIT CABLE CONNECTIONS
Route cables that connect to the circuit breaker
cell to avoid interference with sharp edges and
moving parts. Observe minimum bending radius
for the type of cable used.
Power cables should be braced and/or laced to
withstand short-circuit forces wherever such
cables are unsupported. Power cables should
be adequately sized to carry the maximum
continuous current in accordance with NEC
requirements and should have an adequate
voltage rating. Cables should be dressed and
terminated as appropriate to the voltage class
and cable manufacturer’s recommendations.
When terminating shielded cables, use
termination kits appropriate for the system
voltage to taper the insulation and reduce
electrical stress. Follow the manufacturer’s
installation instructions provided with the
termination kit.
Fasten the cables to the main circuit terminals
(Fasten the cables to the main circuit terminals
Fig. 12). Use 35 mm Class 8.8 M10 or M12
hex head bolts, 2 flat washers, a lock washer
and a nut. While securely preventing the nut
from rotating with a wrench, torque the bolt to
250-315 kgf-cm (18-23 ft-lb) for M10 bolts or
450-565 kgf-cm (32-41 ft-lb) for M12 bolts.
Use two wrenches to torque
the connection to prevent
applying excessive force to
the terminal that can
damage the frame.
Fig. 11 Fastening Cell to Compartment Floor
or Shelf
Fig. 12 Fastening Cables to Main Circuit
Terminals
CAUTION
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