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26 DOCA0005EN-04
Hardware and installation iEM3100 / iEM3200 / iEM3300 series user manual
LonWorks communications wiring: iEM3175 / iEM3275 / iEM3375
• The LON communications connection is polarity-independent.
Power system wiring
The diagrams below illustrate how to connect the meters to a single-phase or three-phase 3-wire or
4-wire power system.
Voltage input protection
The meter’s voltage inputs must be wired to fuses/breakers and a disconnect switch. If using a voltage
transformer (VT), both primary and secondary sides of the VT must be fused and switched.
• Clearly label the device’s disconnect circuit mechanism and install it within easy reach of the
operator.
• Fuses / circuit breakers must be:
— installed in accordance with all local and national electrical codes and standards, and
— rated for the installation voltage, available fault current, and sized for connected loads.
• Fuse for neutral is required if the source neutral connection is not grounded.
Current input protection for 1 A and 5 A meters
For all connected current inputs on 1 A and 5 A meters with external CTs, use a CT shorting block to
short-circuit the secondary leads of the CTs before removing the current input connections to the
meter.
NOTE: Ground any unused current inputs on 1 A and 5 A meters.
iEM31•• and iEM33•• devices associated with a contactor
Connection requirements for iEM3100 / iEM3110 / iEM3115 / iEM3135 / iEM3150 / iEM3155 /
iEM3165 / iEM3175 / iEM3300 / iEM3310 / iEM3335 / iEM3350 / iEM3355 / iEM3365 / iEM3375:
• When the meter is associated with a contactor, connect the meter upstream of the contactor.
• The meter must be protected by a circuit breaker.
Service
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices.
See NFPA 70E in the USA or applicable local standards.
• This equipment must only be installed and serviced by qualified electrical personnel.
• Turn off all power supplying this device and the equipment in which it is installed before working
on the device or equipment.
• Always use a properly rated voltage sensing device to confirm power is off.
• Replace all devices, doors and covers before turning on power to this equipment.
• Do not exceed the device’s ratings for maximum limits.
Failure to follow these instructions will result in death or serious injury.