Template · Service and panels

Meter-main with feed-through lugs single line diagram

Outdoor meter-main feeding large loads and the interior panel. Use this where the meter and main breaker are combined outdoors in a meter-main, with large loads fed from it directly and feed-through lugs supplying the panel inside.

A free template with typical ratings, conductor callouts and general notes. Open it, change what differs on your job, fill in the title block and export a PDF.

Open this template in the editor Download the SVG

Meter-main with feed-through lugs. 12 devices on an 11 × 17 in sheet with a title block and notes column.

What the reviewer checks on this drawing

The reviewer checks the meter-main as the service disconnect, the interior panel as a subpanel with isolated neutrals, and that the feed-through conductors are protected by the 200A main.

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	Meter-main	200A outdoor · NEMA 3R	Service conductors, per utility
Circuit breaker	200A 2P	Main breaker
Panel	Meter-main distribution	200A bus · 8 spaces
Circuit breaker	60A 2P
EV charger	Level 2 EVSE	48A
Circuit breaker	40A 2P
Load	A/C condenser
Device	Feed-through lugs (LUGS)
Panel	Interior panel	200A MLO · neutrals isolated	3 #3/0 Cu + #6 G
Circuit breaker	Existing	House circuits
Load	Existing loads

Notes on the sheet

Meter-main is the service disconnect. Interior panel is a subpanel with isolated neutrals.
Feed-through conductors are protected by the 200A main breaker.

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.