Bulletin No. 3020IM9503R6/98 Power Meter
December 1998 Chapter 5—Wiring
1998 Square D All Rights Reserved 21
CHAPTER 5—WIRING
HAZARD OF PERSONAL INJURY OR DEATH.
Only qualified electrical workers should install and wire this equipment.
Such work should be performed only after reading this complete set of
instructions. Follow proper safety procedures regarding CT secondary
wiring. Never open circuit the secondary of a CT.
Failure to observe this precaution will result in death or severe
personal injury!
DANGER
!
WIRING CTs, PTs, AND CONTROL POWER
System Type Sys ID # CTs # PTs
➀
PT Conn. Currents Voltages Figure #
3Ø, 3W Delta 30 2 0 or 2 Open Delta A, B
➁
, C A-B, C-B, C-A
➁
5-3,
Calculated B 5-4
3∅, 3W Delta 31 3 0 or 2 Open Delta A, B, C A-B, C-B, C-A
➁
5-5
Metered B Phase
3∅, 4W Wye 40 3 0 or 3 Wye-Wye A, B, C, N
➂
A-N, B-N, C-N 5-6,
A-B
➃
, B-C
➃
, C-A
➃
5-7
Table 5-1
System Connection Types
➀ PTs not required at 600 volts (line-to-line) or below.
➁ Calculated.
➂ Calculated, PM-620 and PM-650.
➃ Line-to-line voltage in the 4-wire mode is calculated and fundamental only.
!
CAUTION
HAZARD OF EQUIPMENT DAMAGE.
External fusing (customer-supplied) is
required
for control power inputs.
Failure to observe this precaution can result in equipment damage.
The power meter supports a variety of 3-phase power system wiring
connections, including 3-wire delta, and 4-wire wye. Table 5-1 lists some
of the most widely used system connections. Additional system connections
are shown in Appendix D.
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