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DIY'r
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523 Posts
Can I add a 220 line to an existing 30 amp dbl pole breaker with an existing 220 line. panel is 100 amp with 4 20 amp breakers and 1 30 amp dbl pole and 1 40 amp dble pole.
You could replace the existing 240V line with the new one on that 30A breaker, but you cannot attach both to the breaker at the same time, no. (Called double-tapping; generally not allowed unless the model of breaker is listed for it. 30A and up are [AFAIS] never listed for it).

If you have the space in the panel, you'd have to add a new breaker for the new line.
 

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Licensed Electrical Cont.
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well only using line for ac window unit 220 plug , what do you recommend
OK Mike. Let's try this from the top.

You have a 240v-30a circuits and receptacle being used for an A/C unit. Correct?
You want to add another 240v receptacle to this existing line. Correct?
For what? What is the draw or circuit requirement?
 
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