Consumption Cts; Solar Design Software - enphase IQ8D-72-E-US Design Manual

Consumption CTs

• Consumption monitoring is optional, and Installers can
order three Consumption CTs Capable of measuring up
to 600A continuous current with 2.5% accuracy.
• Internal aperture of the split core Consumption CTs
measures 50mm x 50mm to support maximum size of
300 KCMIL THWN conductor.
• Two 600A Consumption CTs can be connected in
parallel if needed with a maximum of two CT wires per
IQ8D Commercial Gateway terminal block.
• Do not install the Consumption CTs in a panel where
they exceed 75% of the wiring space of any cross-
sectional area within the panel. (NEC 2017 312.8).
• For net consumption metering, ensure there is
sufficient room to install both CTs around lines 1, 2 and
3 from the main feeds.
• For total consumption metering, ensure there is
sufficient room to install the CTs around the lines that
feed the consumption circuit.
• You must use a protected route in conduit for the CT
wires from the AC mains to the IQ8D Commercial
Gateway.

Solar Design Software

A range of design tools are available to simplify your Enphase Commercial design project. Enphase is supported by major
design/simulation tools available in market. Please contact software vendor for more information.
© 2022 Enphase Energy Inc. All rights reserved.
• Consumption CTs lead extension – If needed, an
electrician may extend the leads of the Consumption
CTs using the following guidance:
- WARNING! To extend the CT leads, the electrician
must use appropriately rated, 18-14 AWG, twisted
pair wire and install it in accordance with all
applicable local electrical codes and the National
Electrical Code (NEC; NFPA 70).
- The electrician may add as much as three ohms
round trip resistance to the Consumption CT or up
to 1.5 ohms per wire.
- Select wire that is Code type, NRTL certified, and
rated for voltage and temperature for the specific
application. Mechanically protect the wires in a
Code type, NRTL certified conduit or raceway.
Use NRTL certified connectors for splices and
insulated splices from one another and from the
raceway, conduit, or junction box, if metallic.
- If you need to extend the leads, refer to the
Enphase IQ8D Commercial Gateway Installation
and Operation Manual at: enphase.com/support.
Do not extend the leads of the production CT.
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