Schneider Electric HRB1684301-01 Voltage and current input wiring, Balanced system considerations

Chapter 2—Hardware referencePowerLogic™ PM5500 series user manual

Power system setup parameters (Continued)

Power system description		Direct connect maximum		# of VTs
—	Symbol
		UL	IEC	(if required)
Meter setting
3-phase 4-wire ungrounded Wye		347 V L-N /	347 V L-N /
—				3 VT or 2 VT
		600 V L-L	600 V L-L
3PH4W Wye Ungnd
3-phase 4-wire grounded Wye		347 V L-N /	400 V L-N /
—				3 VT or 2 VT
	N	600 V L-L	690 V L-L
3PH4W Wye Gnd
3-phase 4-wire resistance-grounded
Wye		347 V L-N /	347 V L-N /	3 VT or 2 VT
—
	N	600 V L-L	600 V L-L
3PH4W Wye Res Gnd

Voltage and current input wiring

For wiring instructions and safety precautions, see the meter installation sheet that was shipped with your meter, or download a copy at www.schneider-electric.com.

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 wired to fuses/breakers and disconnect switches.

•Clearly label the device’s disconnect circuit mechanism and install it within easy reach of the operator.

•The fuses / circuit breakers must be rated for the installation voltage and sized for the available fault current.

•Fuse for neutral terminal is required if the source neutral connection is not grounded.

See the meter installation sheet for fuse ratings.

Current input protection

For all connected current inputs, 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.

Balanced system considerations

In situations where you are monitoring a balanced 3-phase load, you may choose to connect only one or two CTs on the phase(s) you want to measure, and then configure the meter so it calculates the current on the unconnected current input(s).

NOTE: For a balanced 4-wire Wye system, the meter’s calculations assume that there is no current flowing through the neutral conductor.

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