Panel capacity, dedicated circuits, and NEMA configuration
EV charging isn't like plugging in a toaster. A Level 2 charger pulls 32-80 amps continuous for hours. That's a sustained load your panel has to handle without overheating, overloading, or creating voltage drop issues. Before we install anything, we verify your electrical system can take it.
NEC 625.42 requires EV charger loads to be calculated at 125% of the continuous load. A 48A charger counts as 60A in your load calculation. If your panel is already near capacity, that 60A pushes you over.
We do a full load calculation per Article 220 before we quote any EV installation. If your service is undersized, we tell you upfront — and we can handle the service upgrade too.
An EV charger gets its own dedicated 240V circuit straight from the panel. No shared circuits, no tapping into existing 240V runs. The breaker must be sized per the manufacturer's spec, and the wire gauge must match the breaker and distance.
We use #6 AWG THHN minimum for 60A circuits, and #4 AWG for runs over 100 feet to prevent voltage drop. Conduit is EMT minimum — we don't run EV charger circuits in Romex.
The "universal" outlet. Supports 40A charging (9.6 kW). Used by Tesla Mobile Connector, most universal chargers.
Wall Connector, ChargePoint Home Flex, JuiceBox 48. Supports up to 48A (11.5 kW). Best for daily charging.
Welder-style outlet. Less common for EVs but supported by some chargers. No neutral — just hot-hot-ground.
For multi-unit dwellings or homes with limited panel space, we install load management systems like the DCC-10 or SimpleSwitch. These devices monitor total panel load and automatically throttle or shut off the EV charger when the panel approaches capacity. When demand drops, charging resumes. No panel upgrade needed.
EV charger installation isn't plug-and-play. It requires load calculations, dedicated circuits, proper wire sizing, and permits. We handle the whole process.
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