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Planning for a Three-Phase IQ Microinverter System – North America
Β© 2017 Enphase Energy Inc. All rights reserved. September 20, 2017
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branch circuit breaker wired directly off the solar subpanel. Wire the IQ Envoy with two hot conductors and a
neutral.
A 208Y/120V interconnection is a Wye type interconnection. A Wye utility service requires a neutral ground
bond at the center point of the transformer.
208Y/120V Electrical Service Conceptual Schematic
Ampacity Calculations for 208V Branch Circuits on Two-Pole Circuit Breakers
Calculate the ampacity of a two-pole branch circuit as follows:
# π‘œπ‘“ π‘€π‘–π‘π‘Ÿπ‘œπ‘–π‘›π‘£π‘’π‘Ÿπ‘‘π‘’π‘Ÿπ‘  βˆ— πΌπ‘›π‘£π‘’π‘Ÿπ‘‘π‘’π‘Ÿ πΆπ‘œπ‘›π‘‘π‘–π‘›π‘œπ‘’π‘  𝑂𝑒𝑑𝑝𝑒𝑑 πΆπ‘’π‘Ÿπ‘Ÿπ‘’π‘›π‘‘ π‘…π‘Žπ‘‘π‘–π‘›π‘” = π΅π‘Ÿπ‘Žπ‘›π‘β„Ž πΆπ‘–π‘Ÿπ‘π‘’π‘–π‘‘ 𝑂𝑒𝑑𝑝𝑒𝑑 πΆπ‘’π‘Ÿπ‘Ÿπ‘’π‘›π‘‘
IQ 6 (208V)
IQ 6+ (208V)
Continuous Output Current Rating
1.11A
1.35A
For a fully populated branch circuit of 11 IQ 6+ Microinverters, the continuous output current rating is:
11 βˆ— 1.35𝐴 = 14.85𝐴
NEC Article 690.9(B) requires a 125% factor be applied to the continuous output current for sizing
overcurrent protection of the branch circuit:
14.85𝐴 βˆ— 1.25 safety factor = 18.6𝐴
A 20A branch circuit overcurrent protection device (OCPD) is required for 11 IQ 6+ Microinverters at 208V.