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How to wire phase monitor
Why use phase monitor?
The problems of low voltage and phase fluctuation (lower voltage on one wire) do not affect resistance loads like light bubs or electric water heater, except to make them burn at dimmer capacity.
However low voltage and phase fluctuations do affect inductive loads like contactors, relays, motors, pumps, HVAC causing problems such as chatter on contactors and relays, and lower rotation speed on motor, causing higher temperatures, and burning out the motor or shortening motor lifespan.
voltage monitor
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IMC492 Single-phase Voltage monitor
Household power 120-240 volt is single phase.
Voltage monitor Protect motors and equipment from low voltage.
Adjustable voltage range
Caution: select monitor voltage to match incoming Line voltage
Select amp rating of contactor to match amp rating of Load (motor, pump etc)
Select matching contactor voltage and coil voltage range
Undervoltage on contactor coil will cause chattering and malfunction, Overvoltage on coil will melt coil.

Single phase 95-270 volt range
3-phase 80-300 volt range
ICM phase monitor
Voltage monitoring relay
Siemens monitoring relay

Surge protector
Difference between surge and ground
Difference between single phase and 3-phase
IMC492 manual
Siemens .pdf
Siemens volotage monitor
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Siemens Single-phase Voltage monitor
Rated 24-240 volt AC

Single phase monitor
"Switching a relay or solid state switch at the zero-crossing point reduces spark across the contacts, extending relay life, and also reduces EMI (electromagnetic interference)."
Extend life of relay by switching at zero cross .pdf
ICM402 phase monitor IMC402 3-phase phase monitor
Protects against phase loss, phase reversal and phase unbalance.
Phase Loss Condition: Equals 25% of nominal for any given phase; system will shut down should this occur

Line voltage on 3-phase 190-600V
Control voltage 115-230V
Output to contactor max 30 amps
Contactor coil rated 27 amp inrush, 7 volt operation

Single phase 95-270 volt range
3-phase 80-300 volt range
ICM phase monitor

IMC 402 pdf
IMC400 manual
Siemens .pdf
IMC400 wiring
IMC400 3-phase phase monitor
Protects against phase loss, phase reversal and phase unbalance.

IMC400 phase line voltage monitor
IMC450 3-phase voltage monitor

IMC 402 pdf
IMC400 manual
IMC450 manual
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /

10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp

Yellow/ #12 gauge wire for 20 amp
with ground
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
White 14 gauge 15 amp

White/ #14 gauge wire for 15 amp
with ground
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
armored cable
Armored cable
Southwire armored cable cutter
Southwire armored cable cutter
Rolls of stranded wire

Stranded wire
stranded wire
Rolls of stranded wire
50-60 amp breaker use 6 gauge /
6-2 wire
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
6-2 wire
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
Copper ground wire
Use same size as other wire in circuit

12 gauge copper ground wire
Ground wire
Green ground wire
Ground pigtails
Ground rods/ ground clamps at Amazon

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When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point.
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