Schneider Electric iEM3100, iEM3300, iEM3200 Danger, Power system wiring, Voltage input protection

Hardware and installation iEM3100 / iEM3200 / iEM3300 series user manual

LonWorks communications wiring: iEM3175 / iEM3275 / iEM3375

Service

•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.

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.

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.

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