220v circuit

I replaced a 220v electric dryer circuit w/4 wire receptacle and 10/3 (4 conductor wire). Wired the red and black hots to each pole of breaker; neutral/grnd to corresponding bus bars in panel. I'm getting 110 from each of the hots to neutral and each of the hots to grnd, but nothing between the two hots (at the receptacle) I had a slight problem installing the breaker in panel as it would not fit in as smoothly as the old one. There was a small tab sticking out from under the bottom of the breaker that was causing it to not fit correctly. Could this be the problem? Does that tab serve a useful purpose? Thanks in advance for your reply(ies)
rescraft

 

You have installed the breaker incorrect. Both sides are on the same bus. You need to move it up or down one space probably to get it to give you 220 across the red black.

 

As Joe said, you have either installed the wrong breaker, or you have installed it incorrectly. A number of different things could be wrong.

First, tell us four things:

(1) What brand it the panel?
(2) What brand is the breaker?
(3) How wide is the breaker, top to bottom (the answer is probably either 1" or 2")?
(4) What is (are) the slot number(s) (the number stamped into the panel cover next to the breaker)?

 

Another thought. You need a full size double breaker with tied handles. Twin/mini breakers will not work.

 

Some brands of panel do have tandem breakers that can be installed in one of two positions, offset by 1/2". So you can either install them in one position on the same bus, producing 120 volts, or you can install them 1/2" lower and they will connect to both buses, producing 240 volts.

 

Thanks to all who replied. Yes indeed it was a misplaced breaker that was causing the non-read between the 2 hots. I had inadvertently switched the 2 pole with the 1 pole breaker beneath it. Thanks a bunch for all your help!