Template · EV chargers

Multi-family chargers with load management single line diagram

Six chargers share a 60A EV feeder under an energy management system. Use this for a condo or apartment garage where more chargers are wanted than the building has capacity for. A new EV panel takes one feeder, and an energy management system shares its current between the vehicles plugged in.

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Multi-family chargers with load management. 17 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 feeder against the system’s setpoint at 125%, where the current is measured, that the setpoint cannot be changed by users, and the building load calculation with the setpoint carried as the EV load.

What the drawing shows

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

Symbol	Label	Rating or detail	Conductors feeding it
From (continues off sheet)	From building switchboard	120/208V 3φ 4W
Circuit breaker	60A 3P	EV feeder
Current transformer	Current transformers	On the EV feeder	4 #6 Cu + #10 G, 1" EMT
Device	EV energy management system (EVEMS)	48A setpoint, networked to the chargers
Panel	EV panel EVP	100A MLO · 120/208V 3φ 4W
Circuit breaker	40A 2P	EV-1
EV charger	EVSE 1	32A max	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-2
EV charger	EVSE 2	32A max	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-3
EV charger	EVSE 3	32A max	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-4
EV charger	EVSE 4	32A max	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-5
EV charger	EVSE 5	32A max	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-6
EV charger	EVSE 6	32A max	2 #8 Cu + #10 G

Notes on the sheet

Unmanaged, six 32A chargers at 208V are 40 kVA, or 111A a phase. The energy management system holds the EV panel to 48A a phase and shares that between the vehicles plugged in, over the network that joins it to each charger.
Feeder sized from the system’s setpoint, treated as a continuous load: 48A × 125% = 60A, on #6 Cu (65A at 75 °C) (NEC 625.42 and 750.30; CEC Rule 8-106).
Each EVSE circuit is still sized for the full 32A of its charger: 40A breaker on #8 Cu.
The system measures the EV feeder with current transformers and signals the chargers; the feeder current does not pass through it. Setpoint fixed at commissioning, protected from change by users, and recorded on a label at the EV panel.
Building load calculation to carry the EV load as the setpoint at 125%: 60A. Two chargers on each of phases A-B, B-C and C-A.

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.