2.8 Wiring Configurations
The WIRING MODE must be set in the instrument in accordance with the wiring
configuration. The wrong wiring mode may result in incorrect readings.
There are seven possible wiring configurations:
No. Wiring Configuration Wiring Mode
1 3-wire direct connection using 2 CTs (2-element)
3DIR
2 3-wire open delta connection using 2 PTs, 2 CTs (2-element)
3OP2
3 3-wire open delta connection using 2 PTs, 3 CTs (2½-
element)
3OP3
4 4-wire WYE direct connection using 3 CTs (3-element)
4Ln3 or 4LL3
5 4-wire delta direct connection using 3 CTs (3-element)
4Ln3 or 4LL3
6 4-wire WYE connection using 3 PTs, 3 CTs (3 element)
4Ln3 or 4LL3
7 4-wire WYE connection using 2 PTs, 3 CTs (2½-element)
3Ln3 or 3LL3
In 4-wire configurations, '4Ln3' or '3Ln3' wiring modes represent line-to-neutral
voltage readings; '4LL3' or '3LL3' wiring modes represent line-to-line voltages.
For 3-wire configurations, voltage readings will always represent line-to-line
voltages. These do not affect readings for harmonic voltages (see Section 2.7).
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