Template · EV chargers

Level 2 charger with load management single line diagram

Energy management system sheds the charger when the service is near its limit. Use this when the service is too full for a charger on paper and an upgrade is not wanted. An energy management system (EVEMS) measures the service current and switches the charger off before the main breaker’s limit is reached.

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.

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Level 2 charger with load management single line diagram: energy management system sheds the charger when the service is near its limit. — Level 2 charger with load management. 9 devices on an 11 × 17 in sheet with a title block and notes column.

What the reviewer checks on this drawing

Show where the current transformers sit (on the service conductors ahead of the main), the setpoint, and the code basis for how the charger is treated in the load calculation.

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
Circuit breaker	200A 2P	Main breaker
Panel	Main panel	200A bus · 120/240V
Circuit breaker	Existing	Branch breakers
Load	Existing loads
Circuit breaker	60A 2P	New
Device	Energy management system (EVEMS)	60A · CTs on service conductors
EV charger	Level 2 EVSE	48A · 11.5 kW	2 #6 Cu THHN + #10 G

Notes on the sheet

EVEMS interrupts the EVSE circuit when measured service current exceeds its setpoint (set here to 80% of the main rating).
Load calculation with a listed energy management system: NEC 220.70 and 750.30 permit its maximum ampere setpoint to be used as the service load, treated as continuous, and 625.42 limits the EVSE load to what the system permits. CEC Rule 8-106 lets the EVSE load be left out where the system monitors the service and controls the EVSE. Confirm the adopted edition.
Current transformers installed on the service conductors ahead of the 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.