Install Cts For Metering - enphase Envoy-S Installation And Operation Manual

3. Install CTs for Metering

The IQ Gateway Metered (ENV-S-EM-230) uses terminal blocks for power and metering connections.
When wiring the IQ Gateway for production and consumption metering, be sure to install the
NOTES:
current transformers (CTs) exactly as described for your application.
When using CTs, do not energise the PV system before the CT installation is complete.
Do not install the CTs 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.
You can run more than one wire through the CT if all wires are on the same phase and they
fit the opening in the CT.
Install one split-core CT (model CT-100-SPLIT-ROW) per monitored phase for production metering
and one split-core CT (model CT-100-SPLIT-ROW) per monitored phase for consumption metering.
Use a protected route in conduit (raceway) for the CT wires to the IQ Gateway. If you need to
extend the leads (up to 148 meters, see "Extend CT Leads, If Needed" on page 16.
Preparation
a. Before running the CT wires through conduit, use coloured tape to mark each of the CTs and
the free ends of its wires, marking each with a different colour. You can run multiple CT
wires through a single conduit.
b. When installing CTs, it is important to match CT and voltage sense phases. Be sure to
consistently identify all the AC lines at three points: the main switchboard feed, the IQ
Gateway, and the solar production circuit breaker. Wire colours may not always consistently
identify Lines 1, 2 and 3. If in doubt, use a multimeter to check.
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IQ Gateway Metered Installation and Operation
© 2022 Enphase Energy Inc. 15 Nov, 2022