eerun165 t1_ir1vd96 wrote
Reply to comment by Randomperson1362 in Wiring EV Charger by Loon610
Wire size can be increased in size to account for voltage drop.
Decreasing wire size from its corresponding breaker is a fire risk. The wire is not rated for the higher current and will heat up (think of the small wires in a toaster).
Viper67857 t1_ir324xm wrote
It's still a 40A circuit on a 40A breaker, it just has wire rated for 55A along most of the run. Using a couple feet of 8ga at the end will not hurt anything.
You already downsize the massive 200A cables coming into your service entrance with 15-20A wires going to most of your devices, then those devices may have some tiny 20+ga wires inside them. You use what you need for the individual load, you don't just carry on the larger cable for consistency.
Viewing a single comment thread. View all comments