1. Power cable is used for power transmission and distribution, overhead equipment, what is control cable and other high-power applications; whereas instrument cable is used for industrial automation and other signal control applications.2. Power cables are used for energy transfer; whereas instrument cables are used for signal transfer. This depends on what performance goal you are looking for. With cable subscriptions, viewers are often locked into lengthy contracts that can be difficult to break or modify without incurring additional fees or penalties. The cable triceps kickback exercise is fairly simple to execute. The cable tricep kickback exercise is one of prime muscle building. Since in many areas a voltage class of 300/500V is completely sufficient, the control cable is used more often.