Single line diagram examples and templates

These are 40 complete single line diagrams for the jobs electrical contractors draw most: EV chargers, solar and battery storage, generators, service upgrades, multi-unit buildings and commercial work. Each one is a finished one-line with typical ratings, conductor callouts and general notes. Use them as examples, or open one in the editor, change what differs on your job and export a PDF. They are free and need no account.

EV chargers

Level 2 circuits, load management, charger banks and DC fast charging. About EV charger single line diagrams

Level 2 charger from main panel

Dedicated 60A circuit to a hardwired 48A charger.

EVView drawing

Level 2 charger with load management

Energy management system sheds the charger when the service is near its limit.

EVView drawing

Charger from subpanel with load management

Garage subpanel feeds the charger through an energy management system.

EVView drawing

Condo charger from meter with load miser

Load management device between the unit meter and unit panel feeds the charger.

EVView drawing

Two chargers with power sharing

A 100A EV load centre feeds two chargers that share a group current limit.

EVView drawing

Commercial Level 2 charger bank

Six 32A chargers from a dedicated 208V EV panel.

EVView drawing

DC fast charging site

Dedicated 480V service with two 120 kW chargers and a site-loads transformer.

EVView drawing

Solar and storage

Load-side and supply-side PV, hybrid inverters, gateways and batteries. About solar and battery single line diagrams

Grid-tied PV, string inverter

Load-side connection through a 40A backfed breaker.

Solar · storageView drawing

Grid-tied PV, microinverters

Two microinverter branches combined in an AC combiner.

Solar · storageView drawing

PV supply-side connection

Line-side tap with a fused, service-rated PV disconnect.

Solar · storageView drawing

PV and storage, hybrid inverter

DC-coupled battery with a backup loads panel.

Solar · storageView drawing

Battery with partial home backup

Backup gateway and a dedicated backup loads panel.

Solar · storageView drawing

Battery with whole-home backup switch

Meter-socket backup switch islands the whole panel.

Solar · storageView drawing

Battery and PV with whole-home gateway

Service-rated gateway ahead of the main panel.

Solar · storageView drawing

Storage system, 10 kW or less

Grid-interactive storage inverter on a 40A breaker.

Solar · storageView drawing

Battery with independent standby generator

Generator transfer switch upstream of the battery gateway.

Solar · storageView drawing

Generators

Interlocks, manual and automatic transfer switches, residential to commercial. About generator single line diagrams

Portable generator inlet with interlock

Backfed 30A breaker mechanically interlocked with the main.

GeneratorView drawing

Generator with manual transfer switch

Ten-circuit manual transfer switch with an inlet box.

GeneratorView drawing

Standby generator, whole-home ATS

Service-rated 200A automatic transfer switch.

GeneratorView drawing

Standby generator, essential loads panel

100A transfer switch feeding an essential loads subpanel.

GeneratorView drawing

400A service with ATS and 200A generator

Service-rated 400A transfer switch feeding two 200A panels.

GeneratorView drawing

Commercial standby generator with ATS

Four-pole transfer switch feeding a standby panel at 120/208V.

GeneratorView drawing

Service and panels

Service upgrades, grounding, subpanels, detached feeders and 400A services. About service and panel single line diagrams

Service and main panel upgrade to 200A

New meter socket, service entrance and 200A panel.

ServiceView drawing

Panel upgrade with grounding system replacement

New panel with rods, water bond and intersystem bonding.

ServiceView drawing

Subpanel addition

100A four-wire feeder to a new subpanel.

ServiceView drawing

Feeder to detached garage or ADU

Underground feeder, building disconnect and local grounding electrode.

ServiceView drawing

400A service with two 200A panels

Class 320 meter socket feeding two main panels.

ServiceView drawing

Meter-main with feed-through lugs

Outdoor meter-main feeding large loads and the interior panel.

ServiceView drawing

Multi-unit

Duplex metering, meter centres and apartment risers. About multi-unit single line diagrams

Duplex with two-gang meter socket

One service drop, two meters, a 100A panel per unit.

Multi-unitView drawing

Multi-tenant meter centre

Six tenant meters and a house meter on a 400A bus.

Multi-unitView drawing

Four-storey apartment panel replacement

Floor panels replaced on existing three-phase risers.

Multi-unitView drawing

Commercial and industrial

Three-phase services, transformers, MCCs, drives, UPS and fire pumps. About commercial and industrial single line diagrams

347/600V service with step-down transformer

Canadian commercial service with a 75 kVA transformer to 120/208V.

CommercialView drawing

480Y/277V service with 208V transformer

800A switchboard with a 75 kVA transformer for 120/208V loads.

CommercialView drawing

Tenant fit-up panel

New metered 100A feeder and panel from base-building distribution.

CommercialView drawing

Motor control centre

MCC with starters, a drive, a lighting transformer and a spare bucket.

CommercialView drawing

Motor branch circuit with VFD

Drive, shielded cable and a motor disconnect within sight.

CommercialView drawing

Fire pump service

Tap ahead of the building main to a listed fire pump controller.

CommercialView drawing

UPS with battery cabinet and critical panel

40 kVA double-conversion UPS feeding a critical loads panel.

CommercialView drawing

Rooftop HVAC equipment feeders

Mechanical panel with breakers and disconnects sized from nameplate data.

CommercialView drawing

Temporary construction power

100A temporary service on a pole with GFCI circuits.

CommercialView drawing