Solar Tap per 705.11 and 705.12

Three code sections apply to sizing buses with PV interconnections.

705.11 addresses connections on the line side of the main breaker.   The bussing after the MCB does not need to be oversized.

705.12 addresses load-side interconnections.

705.12(3) addresses busbar sizing and has two parts:

(1) states that the bus must be sized to the MCB plus the PV disconnect.

SAMPLE SOLAR SINGLE LINE DIAGRAM11

(2) addresses the situation when the PV disconnect is at the opposite end of the MCB and states that the PV can be as large as 20% of the MCB without the need for oversizing the bus bar.

1.2x BASBAR-MAIN OCPD>=MAX SOLAR BACKFEED CALCULATION

SAMPLE SOLAR SINGLE LINE DIAGRAM1
SAMPLE SOLAR SINGLE LINE DIAGRAM2

NOTE: ENSURE THERE IS ADEQUATE SPACE FOR SLAR EQUIPMENT, INCLUDING AT LEAST AN NGOM METER AND A FUSED DISCONNECT.

SAMPLE SOLAR EQUIPMENT ELEVATION 200A