I have a very small one car garage for my shop and unfortunately, I have one plug in the garage. Due to this, I have been using an extension chord when running my heavy tools (table saw, planer, etc) that can't be easily or conveniently relocated over to the plug. The chord appears to be a pretty heavy cord and has a ground socket on it. I was talking to a co-worker of mine and he said that using an extension cord on some of my heavier tools could actually ruin them in the long run. Is this true? He also stated that I might be able to run them off a extension cord but it should be a special cord designed for such tools. I really have no idea of what I should look for in a cord and wouldn't even know where to begin. Can anyone confirm what he's saying and have any advice for the type of cord I'd need?