Circuit Protection
The Fronius Smart Meter is considered “permanently connected equipment“ and
requires a disconnect means (circuit breaker, switch or disconnect) and overcurrent pro-
tection (fuse or circuit breaker).
The Fronius Smart Meter only draws 10-30 mA, so the rating of any switches, discon-
nects, fuses and / or circuit breakers is determined by the wire gauge, the mains voltage
and the current interrupting rating required.
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The switch, disconnect or circuit breaker must be within sight and as close as prac-
ticable to the Fronius Smart Meter and must be easy to operate.
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Use circuit breakers or fuses rated for 20 amps or less.
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Use ganged circuit breakers when monitoring more than one line voltage.
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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 pro-
tection device must interrupt both neutral and ungrounded conductors simultan-
eously.
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The circuit protection / disconnect system must meet IEC 60947-1 and IEC 60947-3,
as well as all national and local electrical codes.
Line Wiring
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Always turn off power before connecting the line voltage inputs to the Fronius Smart
Meter.
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For the line voltage wires, 16 to 12 AWG stranded wire, type THHN, MTW or THWN,
600 V are recommended.
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Do not place more than one wire per screw terminal; use separate wire nuts or ter-
minal blocks if needed.
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Verify that the line voltages match the line-to-line and line-to-neutral values printed in
the white box on the front label.
Connect each conductor to the appropriate phase; also connect ground and neutral (if
applicable). The neutral connection “N“ is not required on delta models but we recom-
mend 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
connected, make sure both terminal blocks are fully seated in the Fronius Smart Meter.
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