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Old 03-02-2010, 02:31 PM   #1
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Strange 240v outlet


I have a 240v outlet in my apartment that appears to have an ancient outdated prong arrangement. It currently has a very old electric stove plugged into it but I intend to use it for something else in the near future.

I would link a picture of the outlet prong arrangement, but I couldn't find anything, even on google image search. So instead I will try to draw it to the best of my ability with ASCII characters.
It looks roughly like this bellow:
.................................................. .................................................. .................................................. ............................................
.........../..... \.................................................. .................................................. .................................................. .........................
...............O.................................. .................................................. .................................................. ...........................................
...............|.................................................. .................................................. .................................................. ............................
.................................................. .................................................. .................................................. ..............................................



The stoves male cord does not use the central prong of the female outlet. The stoves cord looks like this:
.................................................. .................................................. .................................................. .............................................
.........../..... \.................................................. .................................................. .................................................. .........................
.................................................. .................................................. .................................................. ..........................................
...............|.................................................. .................................................. .................................................. ............................
.................................................. .................................................. .................................................. ..............................................


Anyhow, what I'm looking for is an adapter to convert this female outlet (first picture) to a modern 240v female prong style. Either that or a male-to-male adapter for a modern 240v male extension cable so it can fit in this outlet.

Thanks


Last edited by BearcatBengal; 03-02-2010 at 02:36 PM.
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Old 03-02-2010, 02:45 PM   #2
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Strange 240v outlet


Where are you located ?

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Old 03-02-2010, 03:45 PM   #3
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Strange 240v outlet


United States, Cincinnati, Ohio. Forgot to mention that in the OP. I know that outlets vary widely from country to country. I doubt the city and state matter though.
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Old 03-02-2010, 03:56 PM   #4
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Strange 240v outlet


Ir looks to me you are describing a standard NEMA 10-50R receptacle (3 wire 50 amp). What you are calling the center terminal is the screw that holds the cover on the receptacle. This can be used with a new stove with a 3 wire pigtail (cord).
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Old 03-02-2010, 04:06 PM   #5
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Strange 240v outlet


Quote:
Originally Posted by rjniles View Post
Ir looks to me you are describing a standard NEMA 10-50R receptacle (3 wire 50 amp).
That's what they called it over here.

3 Wire 220 Volt Outlet
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Old 03-02-2010, 04:59 PM   #6
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Strange 240v outlet


Since you are in an Apt you need to have the owner of the property arrange to have this electric work completed
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Old 03-02-2010, 05:07 PM   #7
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Strange 240v outlet


Just what are you planning to do with this receptacle (what is your new intended use?). You can continue to use as a range receptacle and replace the range, but to replace the receptacle and use for another purpose there are permit and landlord issues to consider.
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Old 03-02-2010, 05:16 PM   #8
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Strange 240v outlet


Quote:
Originally Posted by Scuba_Dave View Post
Since you are in an Apt you need to have the owner of the property arrange to have this electric work completed
Quote:
Originally Posted by rjniles View Post
Just what are you planning to do with this receptacle (what is your new intended use?). You can continue to use as a range receptacle and replace the range, but to replace the receptacle and use for another purpose there are permit and landlord issues to consider.
Note that the OP says they want a converter, not do electrical work.

But I'd still question the removal of an existing stove on rental property.


Quote:
Originally Posted by BearcatBengal View Post
Anyhow, what I'm looking for is an adapter to convert this female outlet (first picture) to a modern 240v female prong style. Either that or a male-to-male adapter for a modern 240v male extension cable so it can fit in this outlet.
When it comes to electricity, you don't want to change the sex of a plug. It's too easy to create the deadly male-to-male cable.

It wouldn't be impossible to build your own converter, basically get a plug that fits this receptical and wire the plug to supply a female receptical like you need. But I'm not sure how electrical codes and landlords would approve of home built 240v extenstion cords.
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Old 03-02-2010, 05:52 PM   #9
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Strange 240v outlet


I would have serious questions about using (or building) some type of converter- remember this receptacle is connected to a 50 amp breaker.

I again ask, what are you doing?
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Old 03-02-2010, 05:56 PM   #10
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Strange 240v outlet


Sorry, I guess I wasn't very clear about my intentions. I have no intention to permanently alter the outlet in any way. I'm also not removing the stove, just unplugging it. I also have no intention of changing the sex of any receptacle.

What I want is to be able to plug a 240v space heater into the outlet. I'm pretty sure most modern space heaters pigtail's will not be compatible with this outlet. I might want to run an extension cable for the space heater so I would also like to be able to find a 240v extension cable (sufficiently low gauge cable) somewhere online preferably.

Thanks
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Old 03-02-2010, 06:04 PM   #11
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Strange 240v outlet


50a breaker you need a 50a extension cord
That will run you maybe up to $100 or more depending upon length

The heater must also be rated for 50a
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Old 03-02-2010, 06:19 PM   #12
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Strange 240v outlet


The biggest 240 volt space biggest I have seen are 30 amp. The plug will not be compatible with what you have and should not be modified to plug into your 50 amp range receptacle.
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Old 03-02-2010, 06:24 PM   #13
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Strange 240v outlet


An alternative would be to use several of the most powerful 120v space heater I can buy. It looks like most 120v space heaters top out at 1500W because at 1500W they are near the threshold to trip a 15A breaker (threshold ~= 15A rms * 120V rms = 1800W rms). However, my apartment does have some 20A circuits so I should be able to use a slightly higher wattage heater (20A * 120V = 2400W threshold) perhaps a 2000W space heater.

I'm well aware that you don't want to overload a circuit for risk of starting a fire. I will be sure to put each heater on its own circuit and proceed with caution. That said, is it possible to buy a 120v space heater that draws more than 1500W anywhere?

Otherwise I'm going to have to make do with the 240v which could be significantly more expensive due to the wire gauges (as I anticipated).
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Old 03-02-2010, 06:25 PM   #14
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Strange 240v outlet


Quote:
Originally Posted by rjniles View Post
The biggest 240 volt space biggest I have seen are 30 amp. The plug will not be compatible with what you have and should not be modified to plug into your 50 amp range receptacle.
If the circuit is rated for 50A why wouldn't I be able to use a 30A space heater (assuming I use an adapter)?
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Old 03-02-2010, 06:29 PM   #15
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Strange 240v outlet


The circuit is protected at 50a for a 50a device
To use a 30a device you need a 30a breaker
You can't feed 50a of power to a 30a device

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