Adding 220 20A breaker but it trips when turned on
You did not strip enough sheath off the cable in the panel. You should have at least 6" of free conductor.
The white should also be marked as a hot with tape or a magic marker. Black or red would work.
The cable also needs to be secured within 12" of the disconnect.
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Last edited by Jim Port; 05-18-2012 at 09:37 PM.