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Help running this 220v machine in my house

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james_s:

--- Quote from: Nusa on January 11, 2023, 06:20:30 am ---Existing installs are grandfathered (3-pin dryer plugs are common in older houses), but haven't been legal for new installs since the mid-90's.

--- End quote ---

But that's because dryers universally (or nearly so) have 120V loads that require a neutral. Can't you still have a 240V receptacle without neutral for something like an air compressor or welder that is purely 240V? The 240V EV chargers I wired up for a friend a few years ago didn't have a neutral, they came with 3 pin 30A plugs.

IanB:

--- Quote from: james_s on January 11, 2023, 06:25:50 am ---
--- Quote from: Nusa on January 11, 2023, 06:20:30 am ---Existing installs are grandfathered (3-pin dryer plugs are common in older houses), but haven't been legal for new installs since the mid-90's.

--- End quote ---

But that's because dryers universally (or nearly so) have 120V loads that require a neutral. Can't you still have a 240V receptacle without neutral for something like an air compressor or welder that is purely 240V? The 240V EV chargers I wired up for a friend a few years ago didn't have a neutral, they came with 3 pin 30A plugs.

--- End quote ---

I have a NEMA 6-20 receptacle for my 240 V appliances. I can't think of a reason why that would be a problem for anything that doesn't require 120 V internally.

J-R:
It's just never going to be logical to call N.A. residential "single" phase, because you would need to differentiate between that and a 230V/240V single phase service with only a SINGLE hot, for example as found in some countries.

However, "split-phase" seems like a reasonable compromise to both "parties" involved.  I'm sure that is why it came into being.

Nusa:

--- Quote from: IanB on January 11, 2023, 06:49:08 am ---
--- Quote from: james_s on January 11, 2023, 06:25:50 am ---
--- Quote from: Nusa on January 11, 2023, 06:20:30 am ---Existing installs are grandfathered (3-pin dryer plugs are common in older houses), but haven't been legal for new installs since the mid-90's.

--- End quote ---

But that's because dryers universally (or nearly so) have 120V loads that require a neutral. Can't you still have a 240V receptacle without neutral for something like an air compressor or welder that is purely 240V? The 240V EV chargers I wired up for a friend a few years ago didn't have a neutral, they came with 3 pin 30A plugs.

--- End quote ---

I have a NEMA 6-20 receptacle for my 240 V appliances. I can't think of a reason why that would be a problem for anything that doesn't require 120 V internally.

--- End quote ---

It's not, since that's two hots and a ground. And I bet your dryer isn't one of those appliances.

The now-banned dryer receptacles (NEMA 10-30) are two hots and a neutral -- the 3-wire dryer cord typically connects the neutral to the dryer chassis to double as a less-safe safety ground. In what is often a wet area. The lack of an independant earth ground is the issue.

administr4tor:
The seller has replied that the machine can work between 220v and 240V

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