2.6
SEL-734 Meter Instruction Manual Date Code 20090730
Installation
Making Rear-Panel Connections
Making Rear-Panel Connections
Refer to Figure 2.8 and Figure 2.9 for wiring examples of typical applications.
Refer to Figure 2.6 for rear-panel connections and component location.
Required Equipment
You will need the following equipment to install SEL-734 rear-panel
connections:
➤ Tools: 1/4" (6 mm) slotted-tip screwdriver for current inputs;
5/32" x 1/32" (4 mm x .8 mm) slotted-tip screwdriver for
Connectorized
®
terminal blocks. See recommended torque
settings and wire sizes in Specifications on page 1.7.
Chassis Ground
(Earthing)
Ground the meter chassis at the ground terminal located on the rear of the
meter.
You must connect the ground terminal labeled GND on the rear of the panel to a
rack frame or switchgear ground for safety and performance. Use 10 AWG
(6 mm
2
) to 12 AWG (4 mm
2
) less than 2 m (6.6 feet) in length for the ground
connection.
Figure 2.7 Grounding Terminal Symbol
Power Supply
Follow these steps to connect power to the SEL-734:
NOTE: The polarity indicators on
terminals A01(+) and A02(–) control
power passes through the POWER
terminals to a fuse and to the
switching power supply. The control
power circuitry is isolated from the
meter chassis ground.
Step 1. Connect the control voltage to the POWER terminals.
Step 2. Apply power to the meter.
➢ Refer to Section 1: Introduction and Specifications for
power supply ratings. The meter power supply rating is
listed on the serial number sticker on the left side of the
meter.
➢ The terminals labeled POWER on the rear panel (A01[+]
and A02[–]) must connect to a power source that
matches the power supply characteristics that your
SEL-734 specifies on the rear-panel serial number
label.
➢ The POWER terminals are isolated from chassis ground.
Use 12 AWG (4mm
2
) to 16 AWG (1.5 mm
2
) size to
connect to the POWER terminals. Connection to external
power must comply with IEC 60947-1 and IEC
60947-3.
Step 3. Place an external switch or circuit breaker in the POWER leads
for the SEL-734. This disconnect device must interrupt both the
hot (H) and neutral (N) power leads.
The maximum current rating for the power disconnect circuit
breaker or optional overcurrent device (fuse) must be 20 A. Be
sure to locate this device within 3.0 m (9.8 feet) of the meter.
Operational power is internally fused by power supply fuse F1.
GND
Grounding Terminal Symbol
Courtesy of NationalSwitchgear.com
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