Veris Industries E31 Series Installation Manual page 16

E31 Series Installation Guide
Wiring (cont.)
Z205667-0G Page 16 of 23
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Aerospond, Veris, and the Veris 'V' logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
Figure 11
V2/N
90 to 277 Vac
V1
Line to Line (L-L) Voltage: 150 to 480 Vac, nominal
Line to Neutral (L-N) voltage: 90 to 300 Vac
Voltage taps are shared by both panels.
Wiring configurations:
120/240V High-Leg 3-wire (ungrounded)
Delta Delta
L3 L3
N
N
L2 L1 L2
120 V/240 V Delta High Leg (where the center tap of one of the three phase-to-phase transformers is grounded): the E3x supports
these applications, as long as the line-to neutral voltage [especially of the High Leg] does not exceed 300 Vac (as in North American
120/240 V High Leg Delta configurations).
In 3-wire (ungrounded) Delta applications, the E3x supports these applications with the following caveats:
Control Power for the meter cannot exceed 277 Vac. In applications where the L-L voltage is 277 Vac or less (e.g. 208 V line-to-
line) it can be connected to two of the phases being monitored without exceeding the limit. For higher voltages (e.g. 480 V
line-to-line), this must be supplied from a source that is 277 Vac or less. It could be a separate source or a transformer can be
used to step it down from two of the phases being measured.
All of the CT inputs (both branches and Aux inputs) are neutral-referenced. One side of each CT is essentially connected directly
to the neutral voltage input. If this is left floating, the solid-core CT strips, split-core CT adapter boards and all CTs will float at
the same potential (while the panel is energized). This does not present a risk to the equipment as long as it is within 300 V
of ground, but should be considered from a safety perspective in the overall application. The E3x will provide measurements
in this application with the accuracy specified, with the exception of line-to-neutral voltages, which will be calculated and
reported, based on a derived virtual neutral voltage, even though they are not relevant.
Corner-grounded delta: the E3x does not support these applications at any voltage level.
The E3x supports measurement of all 4-wire Wye, 3-wire split-phase and 2-wire single phase and configurations that operate
between 90 and 300 Vac line-to neutral.
©2015 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com
Other companies' trademarks are hereby acknowledged to belong to their respective owners.
V1 V2 V3 N
L - L L - N
Corner-grounded
Delta
L3
X
L1 L2 L1
4-wire 3-wire
Wye Split-phase
L3
L2
N
N
L1
L2 L1
TM
2-wire
Single-phase
L1
N
0815