I have an uncle that when he built his house, he built a gun safe room with a vault door. The door actually looks like a metal 6 panel door. The keypad to open the door is about 8' away in a closet and has 3 9v batteries to power the system, and uses a standard 3 line phone cord to connect the keypad to the door. The motorized mechanism in the door went bad, and a locksmith came out to repair the door. He suggested a different manufacturer and started to replace the mechanism. But he couldnt get the keypad to power the lock. When he took the keypad to the lock with a short leash, it worked. Tech support told him the longer run was losing too much current. Would replacing the pre-made wire with some cat6 add enough copper to carry amps to the lock?

Unfortunately, I dont have any data on the lock system.