Direct connect voltage limits
The meter's voltage measurement inputs are rated by the manufacturer for up to 400 V L-N / 690 V L-L. However, the maximum voltage allowed for direct connection may be lower, depending on the local electrical codes and regulations. In US and Canada the maximum voltage on the meter voltage measurement inputs may not exceed 347 V L-N / 600 V L-L.
If your system voltage is greater than the specified direct connect maximum voltage, you must use VTs (voltage transformers) to step down the voltages.
|
Power system description |
Meter setting |
Symbol |
Direct connect maximum (UL) |
Direct connect maximum (IEC) |
# of VTs (if required) |
|---|---|---|---|---|---|
|
Single-phase 2-wire line-to-neutral |
1PH2W LN |
|
347 V L-N |
400 V L-N |
1 VT |
|
Single-phase 2-wire line-to-line |
1PH2W LL |
|
600 V L-L |
690 V L-L |
1 VT |
|
Single-phase 3-wire line-to-line with neutral |
1PH3W LL with N |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
2 VT |
|
3-phase 3-wire Delta ungrounded |
3PH3W Dlt Ungnd |
|
600 V L-L |
600 V L-L |
2 VT |
|
3-phase 3-wire Delta corner grounded |
3PH3W Dlt Crnr Gnd |
|
600 V L-L |
600 V L-L |
2 VT |
|
3-phase 3-wire Wye ungrounded |
3PH3W Wye Ungnd |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
2 VT |
|
3-phase 3-wire Wye grounded |
3PH3W Wye Gnd |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
2 VT |
|
3-phase 3-wire Wye resistance-grounded |
3PH3W Wye Res Gnd |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
2 VT |
|
3-phase 4-wire open Delta center-tapped |
3PH4W Opn Dlt Ctr Tp |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
3 VT |
|
3-phase 4-wire Delta center-tapped |
3PH4W Dlt Ctr Tp |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
3 VT |
|
3-phase 4-wire ungrounded Wye |
3PH4W Wye Ungnd |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
3 VT or 2 VT |
|
3-phase 4-wire grounded Wye |
3PH4W Wye Gnd |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
3 VT or 2 VT |
|
3-phase 4-wire resistance-grounded Wye |
3PH4W Wye Res Gnd |
|
347 V L-N / 600 V L-L |
400 V L-N / 690 V L-L |
3 VT or 2 VT |
|
NOTE:
|
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