I have a 6 hp 230 volt air compressor motor that I have wired on a twin 20 amp breaker with a 10/2 wire. I cannot get the motor to start, I have took it off and had it checked and it works fine, just not when I wire it up in my garage. I do have power at my 10/2 wire, and cannot understand why it won't start. Any suggestions?

Is it really a "twin"/"tandem" breaker. i.e. Independent breakers or is it

A "ganged" breaker" where the actuator is connected by a bar?

EDIT: Fixed per Washington's response

It is a Federal twin breaker... No bar connections

Can you list the name plate information .

Do you have 240 volts to motor connections?

Is it really a "twin" breaker. i.e. Independent breakers or is it

a "Tandem breaker" where the actuator is connected by a bar?
Twin and Tandem are the same. Most know it as Tandem.

Erased comment--to wait for response!

Name plate says 14 amps 230 volt...

Name plate says 14 amps 230 volt... It should have more than that. You listed 6HP in your first--you had to get this from some where. Please list everything from your name plate.

Just curious!

OK wrong words:

Tandem - two separate independently acuated breakers in one breaker spot.
Ganged - 1 actuator, 2 breakers

Does your breaker look something like this: http://doitbest.com/Fuse+Boxes-Square+D+Co.-model-QOT1515-doitbest-sku-528227.dib

Or is it two different breakers in the panel?

Nonetheless, not having a bar between the poles makes it the wrong breaker.
You could have 0V between these and 120 between each pole and ground. That would make it not work.

Does your breaker look something like this: http://doitbest.com/Fuse+Boxes-Square+D+Co.-model-QOT1515-doitbest-sku-528227.dib

or is it two different breakers in the panel?

Nonetheless, not having a bar between the poles makes it the wrong breaker.
You could have 0V between these and 120 between each pole and ground. That would make it not work.
I agree!