Circuit Protection; Line Wiring - Fronius Smart Meter 240V-3 UL Operating Instructions Manual

Circuit Protection

The Fronius Smart Meter is considered "permanently connected equipment" and requires
a disconnect means (circuit breaker, switch or disconnect) and overcurrent protection (fuse
or circuit breaker).
The Fronius Smart Meter only draws 10-30 mA, so the rating of any switches, disconnects,
fuses and / or circuit breakers is determined by the wire gauge, the mains voltage and the
current interrupting rating required.
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Line Wiring

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Connect each conductor to the appropriate phase; also connect ground and neutral (if ap-
plicable). The neutral connection "N" is not required on delta models but we recommend
connecting it to ground if neutral is not present.
The screw terminal can handle wire up to 12 AWG. Connect each voltage line to the green
terminal block as shown in the following figures. After the voltage lines have been connect-
ed, make sure both terminal blocks are fully seated in the Fronius Smart Meter.
When power is first applied, check that the LEDs behave normally. If you see LEDs flashing
red-green-red-green, the voltage is too high for this model, so disconnect the power switch
immediately!
9.8 mm (0.386 in)
Ø
136.6 mm (5.375 in)
5.1 mm (0.200 in)
Ø
38 mm (1.50 in) High
The switch, disconnect or circuit breaker must be within sight and as close as practi-
cable to the Fronius Smart Meter and must be easy to operate.
Use circuit breakers or fuses rated for 20 amps or less.
Use ganged circuit breakers when monitoring more than one line voltage.
The circuit breakers or fuses must protect the mains terminals labeled L1, L2 and L3.
In the rare cases where neutral has overcurrent protection, the overcurrent protection
device must interrupt both neutral and ungrounded conductors simultaneously.
The circuit protection / disconnect system must meet IEC 60947-1 and IEC 60947-3,
as well as all national and local electrical codes.
Always turn off power before connecting the line voltage inputs to the Fronius Smart
Meter.
For the line voltage wires, 16 to 12 AWG stranded wire, type THHN, MTW or THWN,
600 V are recommended.
Do not place more than one wire per screw terminal; use separate wire nuts or termi-
nal blocks if needed.
Verify that the line voltages match the line-to-line and line-to-neutral values printed in
the white box on the front label.
153 mm (6.02 in)
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