Bulletin No. 3020IM9503R6/98 Power Meter
December 1998 Chapter 5—Wiring
1998 Square D All Rights Reserved 31
Deriving Control Power from Phase Voltage Inputs
Whenever possible, derive power meter control power from a stable voltage
source. If such a source is unavailable, the power meter can derive control
power from the metered circuit up to 600 V, or from its phase PT inputs. Due
to the wide range of permissible control power inputs, the power meter can
accept either L-N or L-L control power inputs up to 600 V.
HAZARD OF EQUIPMENT DAMAGE.
External fusing is required when bringing line voltages to the power
meter or other metering device.
Failure to observe this precaution can result in equipment damage.
2. Connect the spade connectors to the 3-phase voltage input terminals
(➀, figure 5-9) and the 3-phase current input terminals (➃, figure 5-9).
Tighten the terminal block screws to 9 lb-in (1.0 N•m).
3. Insert 14 AWG control power wires into the control power terminal block
as shown in figure 5-9. Derive control power from one of these sources:
– a stable ac source
– phase voltage inputs
– dc power source
Tighten terminal screws to 4 lb-in (0.45 N•m).
4. Ground the power meter. See Grounding the Power Meter in this chapter
for instructions.
5. If all wiring is complete, snap the terminal shield into the closed position.
HAZARD OF ELECTRICAL SHOCK, BURN, OR EXPLOSION.
• Turn off all power supplying this equipment before opening the
terminal shield or making connections.
• Snap terminal shield into closed position before turning power on.
Failure to observe these precautions will result in death or severe
personal injury!
DANGER
!
!
CAUTION
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