EV Load Management

DCC (Thermolec / RC Devices / RVE): EV Load Management Charger Size

The DCC Electric Vehicle Energy Management System is a shed (disconnect) device. This is the charger it enables and the branch it needs, with the NEC basis declared by us and the manufacturer named only for how the device behaves.

How the Device Works

The device function: momentarily turning off power to the charging station when demand exceeds 80% of the main breaker rating. The DCC is a demand-control relay: it monitors the whole panel with a CT and momentarily disconnects the EV charging station when total demand approaches 80% of the main, so the EV is held out of the service load calculation. Because it disconnects, the service stops being the binding constraint and the charger is bounded by 80% of its own pass-through breaker (and the branch). It recovers automatically after roughly 15 minutes.

Adjustable range / setpoint: DCC-9 trip threshold selectable 60% / 70% / 80% of the main.

Charger & Branch by Rating

The branch is always 125% of the full EVSE hardware output (NEC 210.20(A) / 625.41). An external device never shrinks the branch; the only legitimate reduction is the EVSE's own restricted-access adjustable rating (NEC 625.42(B)).

Models

All 3 models compute the same charger (80% of the EV breaker). They differ in the internal breaker, the maximum monitored service, and the application.

Minimum Main by Charger Size

The manufacturer publishes the minimum main the device may be installed on for each charger breaker size.

Listing & Source

Listing: the manufacturer states the device is listed but does not print a listing number, so none is shown here.

Device function transcribed from the manufacturer: DCC (Thermolec / RC Devices / RVE) documentation, accessed 2026-07-11. TYPE = shed, transcribed from the DCC installation manual; the DCC-12 service x max-EV-breaker matrix is from the DCC-12 manual page 10. All three models compute the identical charger (0.80 x the EV breaker); the model differences are the internal breaker, the max monitored service, and the application. No UL/CSA number is published in the manuals (they state only 'UL Listed and/or CSA Certified'), so none is printed here.

Frequently Asked Questions

Compute Your Biggest Charger

Enter your service and measured demand for the base NEC 220.87 answer, then compare it against what a shed device unlocks.

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