3
Instruction Leaflet
IL29C109J
E
ive November 2013
Installation Instructions for ND, HND, NDC, CND,
CHND, CNDC Circuit Breakers with Digitrip OPTIM
Trip Unit and Powernet, and/or Zone Interlock
EATON CORPORATION
www.eaton.com
2.0
INSTALLATION
The installation procedure consists of inspecting the cir-
cuit breaker and, as applicable, installing the rating plug
and terminals; mounting the circuit breaker; connecting
the line and load conductors; torquing terminals; and
attaching terminal covers. Circuit breaker frames, rating
plugs, accessories, mounting hardware, and unmounted
terminals may be supplied in separate packages. To
install the circuit breaker, perform the following steps.
Compare nameplate data with existing equipment
ratings and system requirements to make sure that the
circuit breaker is suitable for the intended installation.
Prior to mounting, confirm that the circuit breaker has
not been damaged during transit or initial handling.
Remove line and load end covers. Mount wire con-
necting terminals as shown in Figure 2-1. Secure the
terminals to the circuit breaker using
two
cap screws
and lockwashers. Torque to 40 to 50 lb-ft. (54.2 to 67.8
N. m). With the circuit breaker mounted and before the
conductors are installed and conductor clamping screws
inserted, the terminal mounting screws may be checked
for correct torque.
THE VOLTAGES IN ENERGIZED EQUIPMENT CAN
CAUSE DEATH OR SEVERE PERSONAL INJURY.
BEFORE MOUNTING THE CIRCUIT BREAKER IN AN
ELECTRICAL SYSTEM, MAKE SURE THERE IS NO
FORMED. SPECIAL ATTENTION SHOULD BE PAID
TO REVERSE FEED APPLICATIONS TO ENSURE
NO VOLTAGE IS PRESENT.
VOLTAGE PRESENT WHERE WORK IS TO BE PER-
Depending on the equipment configuration, the cir-
cuit breaker can be mounted using different styles
of hardware. The following steps describe how to
mount the circuit breaker using standard hardware.
When special hardware is needed (for example, with
the motor operator), the instruction leaflet describ-
ing the accessory also describes the special mount-
ing arrangements.
2-3. To mount the circuit breaker, perform the following
steps:
a. For individual surface mounting, drill mounting panel
using the drilling plan shown in Figure 2-3. For
front cover applications, cut out cover to correct
escutcheon dimensions, see Figure 2-4. Make sure
accessory wiring is accessible when the circuit breaker
is mounted.
Figure
2-1
Terminal Installation
b. Position circuit breaker on mounting surface.
c. Install circuit breaker mounting screws and washers.
Torque mounting screws to 30-35 Ib-ft. (41-47
CAUTION
WHEN ALUMINUM CONDUCTORS ARE USED, THE
APPLICATION OF A SUITABLE JOINT COMPOUND
IS RECOMMENDED TO REDUCE THE POSSIBILITY
OF TERMINAL OVERHEATING. OVERHEATING CAN
CAUSE NUISANCE TRIPPING AND DAMAGE TO
THE CIRCUIT BREAKER.
Connect line and load conductors and accessory
leads.
Install the supplied neutral current sensor in the
neutral pole of a four-wire system, see Figure 2-7 and
wiring diagram 29C894.
After the circuit breaker is installed, check all
mounting hardware and terminal connecting hardware
for correct torque loading. Torque values for line/load
terminals are given on the circuit breaker nameplate.
Re-install load end and line end covers and secure
with pan head screws provided. Torque large screws to
35-45 Ib-in. (4.0-5.0
and small screws to 24-30
in. (2.7-3.4
When using the terminals TA700NB1
or T700NB1, or when prospective fault currents of
cabled installations exceed 65kA (such as NDC applica-
tions) the conductors are to be braced in accordance
with Figure 2-5.
!
WARNING
2.1
2.2
