If you need to extend your 220v line, there are a few things you need to take into consideration. First, you need to make sure that the new line you're installing can handle the amount of power you need. Second, you need to make sure that the new line is properly grounded. Finally, you need to make sure that the new line is rated for the same voltage as your existing line.
If you're not sure how to handle any of these considerations, it's best to hire a professional electrician to help you out. They'll be able to help you choose the right materials and install the new line properly, ensuring that it can handle the power you need and is safe to use.