Extend Ct Leads, If Needed - enphase ENV-S-WM230 Installation And Operation Manual

WARNING! Do not install the CT in a panel where they exceed 75% of the wiring space of
any cross-sectional area within the panel, or refer to local standards for guidance.
a. Make sure that the AC mains wire(s) are de-energised until you have secured the CT wires in the
terminal blocks.
b. Take care to identify L1, L2 and L3.
c. Connect the white wire from Line 1 to "I1•" and the blue wire to "I1".
d. Connect the white wire from Line 2 to "I2•" and the blue wire to "I2".
e. Connect the white wire from Line 3 to "I3•" and the blue wire to "I3".
Open and clamp the CT on the main supply lines (Line 1, Line 2, and Line 3, if used). When the
f.
consumption CT is on the line (active) conductor, the arrow should point toward the load (away
from the grid).
g. Tighten all connections to 0.56 Nm.
NOTE: Only run active conductors through the CT. The CT can monitor multiple active
conductors.

Extend CT Leads, If Needed

If needed, an electrician may extend the CT leads using the following guidance:
WARNING! To extend the CT leads, the electrician must use appropriately rated, 0.75 mm
to 2.5 mm
The electrician may add as much as three ohms round trip resistance to the CT or up to 1.5 ohms per
wire. For reference, the following maximum lengths at 75° C by gauge are:
64 meters of 0.75 mm

85 meters of 1 mm

128 meters of 1.5 mm

213 meters of 2.5 mm

Resistance figures may not be appropriate for all geographies or installation conditions. A qualified
electrician must determine the wire gauge and type to obtain a maximum round trip resistance of three
ohms.
Select wire that is code type and rated for voltage and temperature for the specific application.
Mechanically protect the wires in a code type conduit or raceway. Use certified connectors for splices
and insulate splices from one another and from the raceway, conduit, or junction box, if metallic.
Buried wires must be certified for direct burial and follow the code for installation. Do not bury splices
unless in a certified junction box rated for the application, and use a certified moisture resistant
connection method.
16
2 , twisted pair wire and install it in accordance with all applicable electrical codes.
7-strand Cu = 1.5 ohms
2
7-strand Cu = 1.5 ohms
2
2 7-strand Cu = 1.5 ohms
2 7-strand Cu = 1.5 ohms
© 2016 Enphase Energy Inc.
Envoy-S Metered Multiphase Installation and Operation
2
141-00035 Rev 01