Template · Solar and storage

PV through a meter socket adapter single line diagram

A meter collar connects the solar ahead of the main breaker, so the panel bus is left alone. Use this when the panel bus has no room for a backfed breaker and the utility accepts a meter socket adapter. The adapter sits between the meter socket and the meter and connects the solar ahead of the main breaker, so the panel is not opened up.

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PV through a meter socket adapter single line diagram: A meter collar connects the solar ahead of the main breaker, so the panel bus is left alone. — PV through a meter socket adapter. 10 devices on an 11 × 17 in sheet with a title block and notes column.

What the reviewer checks on this drawing

The utility checks that the drawing shows a connection at the meter, not a breaker in the panel, with the adapter’s make, model and rating. The reviewer checks the adapter’s listing and the inverter output at 125% against the adapter’s breaker.

What the drawing shows

Every device on the sheet, in the order power reaches it.

Symbol	Label	Rating or detail	Conductors feeding it
Utility source	Utility service	120/240V 1φ 3W
Meter	Utility meter	200A socket	Service conductors, per utility
Device	Meter socket adapter (MSA)	200A · between socket and meter, utility approved
Circuit breaker	200A 2P	Main breaker
Panelboard	Main panel	200A
Circuit breaker	40A 2P	Adapter breaker
Disconnect switch	AC disconnect	60A non-fused, lockable, visible blade	3 #8 Cu + #10 G
Inverter	String inverter	7.6 kW · 240V · 32A, integrated DC disconnect
Device	Rapid shutdown (RSD)	Module-level devices	PV wire #10 Cu + #10 G, 2 strings
PV array	PV array	20 × 400W = 8.0 kW DC

Notes on the sheet

The adapter connects the PV on the supply side of the service disconnect (NEC 705.11 and 230.82(6)). The panel bus is not backfed, so there is no busbar check and no main breaker to change.
Adapter listed for the purpose and accepted by the utility for this meter socket. It fits the plug-in socket models its maker lists it for, not a bolt-in socket. Its breaker’s interrupting rating to equal or exceed the available fault current.
The disconnect and overcurrent protection for a supply-side connection are to be suitable for use as service equipment (NEC 230.82(6) and 705.11): the adapter’s breaker where its listing says so, otherwise a fused, service-rated AC disconnect.
Inverter output 32A × 125% = 40A, the rating of the breaker in the adapter.
Give the adapter’s make, model and rating on the interconnection application. The utility pulls and resets the meter, or witnesses it.
Rapid shutdown per NEC 690.12 (CEC Rule 64-218).

Diagram is schematic and not to scale. Field-verify existing equipment ratings. Ratings and conductor sizes shown are typical. Confirm against the adopted code, the equipment listing and a load calculation before installation. Code references are to the 2023 NEC and the 2024 Canadian Electrical Code: see references and editions.