[throwaway-blaze]

This doesn't make sense. Wall plugs (like circuit breakers) are designed for a particular max amperage draw. If I have a 10A 120V circuit and wall plug, I can't charge my car at 8A?

I have wall ovens that connect via a 50A circuit. Do I need to worry about fire hazards when I bake something for hours and hours?

[Volundr]

Not an electrician, consult a real one for any actual electrical work or questions.

It's complicated. Heat builds up over time. So for example your standard 15 amp breaker on a 14 gauge wire in the US is rated for 15 amps of intermittent use, but if you draw that continuously without letting the heat dissipate it becomes a fire hazard. IIRC circuits are generally rated for ~80% of their max load for continuous use, so that 15 amp circuit is considered good for 12 continuous. Or in your 10 amp example 8 should be ok.

Your oven and circuit should be sized such that your long cooks aren't a concern, if you look at it's label you'll probably find it has a max draw of well below 50amps, but if you have actual doubts ask a professional.

[Astronaut3315]

Also not an electrician.

A concern for high current outlets in the US, such as NEMA 14-50, is that they weren't necessarily designed for a large number of plug/unplug cycles. Typically you'd plug your stove in and leave it there for years to decades.

If you use the same 14-50 outlet for car charging, which is not uncommon, the contacts can lose their grip over time. End users may want to take their mobile EVSE with them and incur cycles on the outlet. Properly installed but worn 14-50s have been known to melt or even catch fire under these conditions.

End users should prefer to have their EVSE(s) hardwired or installed with a higher grade outlet like Hubbell or Bryant.

[hvb2]

Having charged 2 EVs on wall sockets for years, I've not seen them go over 12 amps, so that checks out.

One of those was a leaf

[eldaisfish]

i'm always surprised how people here downvote correct information. This is 100% correct because heat in electrical wiring is a function of power (current) and time. The vast majority of electrical devices in a typical home use under 80% of their rated power. The few that do use their full power, like a resistive heater, often do not run continuously.

In contrast, it is completely normal to charge an EV at a socket's maximum power for over ten hours straight. This time component is why charging EVs from a regular AC outlet can be a fire risk.

[quesera]

FWIW, oven/range circuits are notoriously overspecified.

Code in the US is 220V/50A. Your wall oven will get the same, despite having a much lower max draw than the usual oven/cooktop combination.

50A (upgraded from 30A several years ago) is specified for having the oven plus all cooktop elements ON. Maximum instantaneous draw will be below 50A. There's also the standard 20% headroom allotment, and some additional safety margin to account for the heat generated by all of the above being ON (or high duty cycle) for an extended period.

[msh]

https://aminacharging.com/articles/can-i-charge-my-car-in-a-...

[Miraste]

That still didn't explain anything. Surely the car could limit itself to 80% of standard socket rated output for continuous draw, like they do in other countries. Are Norwegian outlets commonly installed so far below spec that that will cause them to catch fire? What was the impetus for this regulation?

[msh]

I don’t know exactly for Norway as that was the best English article I could find. A standard danish outlet (they are crap) is 16A but is not rated for more than 6A if the load is continuous for more than 2 hours.

[aidenn0]

Then use a 6A charger? Assuming it's 2x the voltage of the US that's the same power as a 12A charger would be in the US, and I get plenty of charging at 16A (which is the maximum continuous load on a 20A circuit)