Residential EV charger with load balancer single line diagram template
Start with this single line diagram template when installing a residential EV charger from the main panel with a DCC-12 load balancer. Be sure to add labels and details as required by your AHJ for an EVSE installation before submittal.
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What's in this EV charger with load balancer single line diagram template
The template shows the EV circuit leaving the main panel through a load balancer before it reaches the charger.
- Utility connection and meter
- Existing 120/240V, 100A main panel with main breaker, 20kAIC, NEMA 1
- 60A EV breaker in the main panel
- Current transformers at the main panel, wired to the load balancer
- New DCC-12 load balancer between the 60A breaker and the EVSE
- New 240V, 48A EVSE
- 2 #6 Cu THHN and a #10 Cu EGC in 3/4" EMT from the breaker to the load balancer and on to the EVSE
- Feed to the home's other loads
- Grounding at the meter
- Title block with contractor, project, and revision info
Every label is editable to match the job.
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EV charger with load balancer single line diagram FAQ
More questions? Email team@kopperfield.com and we'll get back to you.
Can I add an EV charger to a 100A panel without a service upgrade?
Often, yes. A load balancer like the DCC-12 de-energizes the charger when the home's load gets above 80% of the main breaker rating, which can avoid a service or panel upgrade. Check your AHJ and utility requirements first.
What is an EV energy management system?
An EV energy management system (EVEMS), also called EV load management, monitors a home's electrical load and pauses or limits EV charging so the total stays within the service capacity. The DCC-12 load balancer in this template is one example.
What is a DCC-12?
The DCC-12 is a load balancer for EV chargers in single-family homes. It works with main breakers up to 200A and EV breakers up to 60A, and it comes in a NEMA 3R enclosure for indoor or outdoor installs. It has no built-in breaker, so the EV breaker stays in the panel.
What is the difference between a DCC-12 and a DCC-9?
The DCC-12 is for single-family homes and connects at the home's panel. The DCC-9 is for condo and apartment units and connects on the load side of the unit's meter. For a unit in a building with a meter bank, use the condo and apartment EV charger template.
Does the NEC count the full EV charger load if you use a load balancer?
Not always. The 2023 NEC 625.42(A) sets the EVSE load on a service or feeder at the maximum allowed by an energy management system that meets 750.30. Confirm which NEC edition your AHJ uses and whether they accept the DCC-12 as the energy management system in your load calc.
What is an electrical single line diagram?
A single line diagram (or one line diagram) is a simplified, easy-to-read graphical representation of an electrical power distribution system. It uses single lines and standard symbols to illustrate the key components such as transformers, circuit breakers, and power sources. A single line diagram provides a clear overview of how electrical power flows within a system and is essential for power system design, maintenance, and troubleshooting.
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