Install The Ct For Consumption Metering (Optional); Extend Consumption Ct Leads, If Needed - enphase ENV-S-WM-230 Installation And Operation Manual

Install the CT for Consumption Metering (optional)

Install one split-core CT to provide consumption metering. Create a protected route with conduit for the
CT wires to the IQ Gateway.
DANGER! Risk of electrocution! CTs must be installed with no current flowing in the sensed
circuit. Always install CT wires in the terminal blocks before energising the sensed circuit.
DANGER! Risk of electric shock. Be aware that installation of this equipment includes risk of
electric shock. If you wire the IQ Gateway at the sub-board, always de-energise the sub-
board before beginning wiring. If it cannot be de-energised, a qualified electrician may safely
install the CT as directed, making sure to connect the leads and then place the CT around
the wire and latch.
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. Connect the white wire to "IA•" and the blue wire to "IA".
c. Clamp the CT on the solar supply Line (active). When the consumption CT is on the line (active)
conductor, the arrow should point toward the load. Unlatch the CT and place Line (active) in
through the opening. Latch the CT and listen for the click as it closes.
NOTE: Only run active conductors through the CT. The CT can monitor multiple active
conductors.
d. Tighten the terminal block screws to 0.56 Nm.

Extend Consumption CT Leads, If Needed

If needed, an electrician may extend the leads of the consumption CT using the following guidance:
WARNING! To extend the CT leads, the electrician must use appropriately rated, 0.75mm
to 1.5mm
2
NOTE: Be advised that this step applies only to the IQ Gateway-M (model ENV-S-WM-230
or ENV-S-AM1-230-60) and not to the IQ Gateway Standard (model ENV-S-WB-230). The
terminal block on Envoy S Standard cannot be used for metering and as these connections
are not internally complete in the IQ Gateway Standard and cannot provide metering
features.
The electrician may add as much as three ohms round trip resistance to the consumption 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
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 insulated 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.
14
, 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
7-strand Cu = 1.5 ohms
2
© 2022 Enphase Energy Inc. All rights reserved.
IQ Gateway-M Installation and
Operation
2
141-00031 Rev 02