[RE-wrenches] Fwd: Neutral Sizing 705.95

[Al Frishman]

Hey Wrenchers,
Wondering what you all think about NEC Article 705.95 and if downsizing the Neutral is common practice.   If your JHA accepts it and the model inverter you are installing complies do you see any issues with downsizing the Neutral?  This section of code has been in place since 2011 and I must admit I have been slow to adopt it.

705.95 Ampacity of Neutral Conductor. The ampacity of the neutral conductors shall comply with either (A) or (B)
(A) Neutral Conductor for Single Phase, 2-Wire In- verter Output. If a single-phase, 2-wire inverter output is connected to the neutral and one ungrounded conductor (only) of a 3-wire system or of a 3-phase, 4-wire, wye- connected system, the maximum load connected between the neutral and any one ungrounded conductor plus the inverter output rating shall not exceed the ampacity of the neutral conductor.

(B) Neutral Conductor for Instrumentation, Voltage Detection or Phase Detection. A conductor used solely for instrumentation, voltage detection, or phase detection and connected to a single-phase or 3-phase utility-interactive inverter, shall be permitted to be sized at less than the ampacity of the other current-carrying conductors and shall be sized equal to or larger than the equipment grounding conductor. 

Al Frishman
EvolvedSolar
(917) 699-6641

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