JonJackjon t1_j2cfdhw wrote on December 31, 2022 at 5:18 AM

Reply to comment by Wellcraft19 in Any code prohibitions on installing a 240v EV charger near a natural gas furnace? by [deleted]

>It’s really only a dance cable hanger, with some added intelligence.

If my memory serves me, the cable is energized with low current only, when being plugged in. After the plug has been mated to the vehicle, the vehicle sends a signal to the wall unit to turn on the high power circuit.

Wellcraft19 t1_j2cfwk8 wrote on December 31, 2022 at 5:23 AM

That - as well as it signals to the car mounted charger how much current it can pull. An EVSE might be connected to a 30A circuit (and can handle 100A) but the onboard charger can pull a full 80A. If it did, it’d trip the supplying breaker, so the EVSE is signaling to the onboard charger (AC/DC converter, a rectifier) how much current that is ‘available’. Only side effect is longer charge times, which rarely is an issue in a home location.

SmashScrapeFlip t1_j2cgd7r wrote on December 31, 2022 at 5:27 AM

there is no code directly related to installation of an EVSE outside of specific states like California that has the Title 24 code. That's coming with the IECC 2024. Only relevant code would be related to the furnace or the electrical panel.

[deleted] OP t1_j2csp3j wrote on December 31, 2022 at 7:45 AM

[deleted]

JonJackjon t1_j2f1knq wrote on December 31, 2022 at 8:02 PM

I believe there are low current "signal" connections that will be made before the high current is enabled. This "signal" is used to energize the high current contacts after insertion.

This info is kinda old and things may have changed. I'll have to look at my local charging station when I get a chance.