I would try not to go over 50' with any power cord. What I have seen happen, is that corrosion builds up on the socket and wiring in the tower. I have had to cut back the wires to the socket and install a new socket. Between the two there is too much resistance.
Keep in mind that as the brakers get older they don't trip as fast. They get stiffer to the point were you cant move them due to the corrosion.