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CLASS 320 METER
6.2 Main Power Board Connections (continued)
Wire Entry:
3.
enclosures. This opening is used for bringing in MAINS power and for current
sensor wiring. One 1/2" conduit opening on the top of the metal enclosure
CL320 can be utilized as an interface for the low- voltage signals, pulse input, or
RS-485 communications wiring to the unit. CL320 meters are available in an
MMU (Multiple Meter Unit) enclosure that holds eight (8) meters (see MMU
installation manual for additional details).This enclosure comes without knock-
outs and allows the user to choose entry points for the wiring.
Any unused openings must be sealed with a UL rated plugging device or hub
suitable for the rating of the enclosure - such as NEMA 1 or 4X
4. Unit MAINS wiring:
The four positions on terminal block TB1, located at the bottom left corner of the
main power board, are clearly labeled Phase A, B, C, N (neutral). Earth Ground
MUST be connected to the PCB mounting screw in the lower right corner.
A. Connect the NEUTRAL wire to the appropriate terminal block position.
NOTE: For 3-wire delta-type applications, do NOT connect the NEUTRAL wire.
Remove the terminal block screw for this position.
B. Earth Ground
Connect the Earth Ground to the PCB mounting screw in lower right corner.
C. External Switch Mechanism/In-Line Fuse Installation
To ensure a safe installation, the Class 320 meter requires an external switch
mechanism, such as a circuit breaker, be installed on the meter's MAINS
input wiring. The switch mechanism must be installed in close proximity to
the meter and easily reachable for the operator. This device must also be
marked as the disconnecting device for the Class 320 meter. 1/10 Amp Slow
Activation in line fuses (KLDR.100, UL listed, Littelfuse rated 600V/100ma)
must be installed for each conductor phase at the MAINS input to the meter.
The fuses must be labeled to indicate voltage and current rating as well as
element characteristics.The fuse element must be slow activating type.
62-0397-02
One 3/4" conduit opening is located on the bottom of the CL320
Fig. 6. Terminal Block TB1, TB2, TB3, and TB4.
14
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