Template · EV chargers

DC fast charger with Level 2 chargers single line diagram

One 60 kW fast charger and four Level 2 chargers through a 208V transformer, on a 480V service. Use this for a site with one DC fast charger and a few Level 2 chargers on a new 480V service: the fast charger straight from the switchboard, the Level 2 chargers through a 208V transformer and their own panel.

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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DC fast charger with Level 2 chargers single line diagram: one 60 kW fast charger and four Level 2 chargers through a 208V transformer, on a 480V service. — DC fast charger with Level 2 chargers. 24 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 fast charger’s input current from the data sheet at 125%, the transformer’s primary and secondary protection, the secondary bonded as a separately derived system, and the emergency shutoff and disconnect locations.

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 transformer	480Y/277V 3φ 4W
Current transformer	CT cabinet	Utility metering
Circuit breaker	400A 3P	Main	2 sets of 4 #3/0 Cu
Panel	Switchboard SB-1	400A · 480Y/277V 3φ 4W
Ground	Grounding electrode system	#2 Cu GEC
Circuit breaker	100A 3P	DCFC-1
Disconnect switch	Disconnect	100A · NEMA 3R, lockable	3 #3 Cu + #8 G
EV charger	DC fast charger	60 kW · 76A input
Circuit breaker	70A 3P	T-1 primary
Transformer	Transformer T-1	45 kVA, 480V Δ – 208Y/120V	3 #4 Cu + #8 G
Circuit breaker	150A 3P	Secondary main	4 #1/0 Cu + #6 G
Panel	EV panel EVP	225A bus · 208Y/120V 3φ 4W
Ground	T-1 grounding electrode	#6 Cu GEC
Circuit breaker	40A 2P	EV-1
EV charger	EVSE 1	32A · 6.6 kW	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-2
EV charger	EVSE 2	32A · 6.6 kW	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-3
EV charger	EVSE 3	32A · 6.6 kW	2 #8 Cu + #10 G
Circuit breaker	40A 2P	EV-4
EV charger	EVSE 4	32A · 6.6 kW	2 #8 Cu + #10 G
Circuit breaker	100A 3P	DCFC-2
Circuit breaker	30A 3P	SPD
Surge protective device	SPD	Type 2

Notes on the sheet

Fast charger input current from the manufacturer data sheet; branch circuit at 125% of continuous input: 76A × 125% = 95A, protected at 100A on #3 Cu (100A at 75 °C).
T-1: 45 kVA ÷ (1.732 × 480V) = 54A primary; × 125% = 68A, protected at 70A on #4 Cu (85A). Secondary 45 kVA ÷ (1.732 × 208V) = 125A, protected at 150A on 1/0 Cu (150A).
Four 32A chargers at 208V: 4 × 6.66 kVA = 26.6 kVA; × 125% = 33.3 kVA, on the 45 kVA transformer.
Service conductors in two parallel sets: 2 × 200A (3/0 Cu) = 400A, on the 400A main. The main and the bus leave room for a second fast charger.
Transformer T-1 secondary is a separately derived system: system bonding jumper at the EV panel’s main, and a grounding electrode conductor to the building electrode, #6 Cu for 1/0 Cu secondary conductors (NEC 250.30). Service grounding electrode conductor #2 Cu for the two sets of 3/0 Cu (NEC Table 250.66).
Emergency shutoff and disconnect locations per the AHJ and charger manufacturer.

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.