An electrician quoted me for a 60 amp breaker and included a disconnect switch in the quote. I’m wondering, does code actually require a disconnect for a 60 amp breaker?
Honestly, I only want a 50 amp setup because the slight speed increase isn’t worth the added cost to me. Also, does it make sense to have a disconnect if my breaker box is just 30 feet away in the basement? I’ve heard that some cheap disconnects could make the system less safe.
I’d avoid using a disconnect for a charger. Most of them are built for light duty, like heat pumps or pool motors, which only draw high power for a few seconds, unlike EV chargers, which can draw maximum power for hours. There are cases where disconnects have melted from the load, even though they were installed by electricians who weren’t familiar with EV chargers.
@Amelia
I’ve seen plugs burn out too. It really depends on the quality of the installation. Plus, you’ll need some way to lock the power open if you ever need to, even under 60 amps. Most breakers aren’t lockable, so having a disconnect can be a good option since they’re typically lockable.
@Ronald
You’ve got the right idea, but the code works a little differently. The disconnect requirement kicks in at above 60 amps, not 60 and under. So, if you’re at 60 amps or below, there’s no special need for a disconnect. Also, most breakers have lockout devices available, which are cheaper and more reliable than a disconnect. For anything above 60 amps, the disconnect has to be lockable and readily accessible.
According to the US National Electrical Code, a disconnect is required for EV chargers rated for more than 60 amps, not at 60 amps or less. Some areas might have stricter local requirements, though.
If you do end up needing a disconnect, don’t go with the cheap pull-out types used for air conditioners. Spend a little more on a better quality model, like the Square D QO, which is a solid option for just a few extra bucks.
Whether or not a disconnect is required depends on where you live. Different countries, states, or provinces have different electrical codes. Without knowing where you are, it’s hard to give a definitive answer.
Nathan said:
Maybe they’re using a disconnect to switch from aluminum to copper wiring? It might be cheaper than running copper all the way.
A disconnect is just safer if the breaker isn’t nearby. Plus, if it’s under 60 amps, you’ll still need a way to lock it open, which most breakers can’t do.
Did the electrician know you wanted the disconnect for a charger?
Added cost
Yep, sounds like they might be marking it up for no reason. You could always call another electrician and ask for a quote, or just say you need a 240V/50 amp outlet for laundry and see what they say.