I have a 20 amp outlet (3 holes with one at 90 degrees) and want to convert it to a standard 15 amp outlet. Can that be done and how do I do that.

If this is in U.S. and there are 3 slots and its fairly big then what your looking at is 220v. What type or outlet are you looking to change it to ?

Shut off power, remove 20 amp and install your 15 amp receptacle on this 20 amp circuit. Its OK.

Does it look like the plug on this page?

Ref:

VWvortex Forums: Welder Plug adaptor question

If this is standard USA home wiring there should be no need to switch this out. The 20 a receptacle can take a 15amp plug. Tell us more details, maybe we are missing the mark until we hear more. If this is what you have, Google Image Result for http://cache1.smarthome.com/images/4537w.jpg you don't kave to do a thing

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Originally Posted by califdadof3

If this is in U.S. and there are 3 slots and its fairly big then what your looking at is 220v.

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What does "big" have to do with "220", or more accurately 240v?
The OP specifically stated 20A. That is no bigger than a standard duplex receptacle.
240v has nothing to do with physical size.

KL, this is what you need to know:

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Originally Posted by ballengerb1

If this is standard USA home wiring there should be no need to switch this out. The 20 a receptacle can take a 15amp plug. Tell us more details, maybe we are missing the mark until we hear more. If this is what you have, Google Image Result for http://cache1.smarthome.com/images/4537w.jpg you don't kave to do a thing

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If what you have is not the one in the pic PLEASE post a pic, drawing or link to the one you have. If the receptacle h as writing on it you can post that as well.
Until then this is all just speculation.

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Originally Posted by stanfortyman

What does "big" have to do with "220", or more accurately 240v?
The OP specifically stated 20A. That is no bigger than a standard duplex receptacle.
240v has nothing to do with physical size.

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From the Op's description it sounded like a dryer plug. ( recepticle). Rated at 20a. If that is the case then we need to know what exactly they are looking to do. Install a reguler 3 prong 120v 15a outlet or change the circuit or what? Some with no experience seem to think a plug is a plug. And we know that's not true and also don't want to give advice and end up someone gets hurt. A 220 plug like dryer plug is usually larger then a standard 120v.