Studies have shown that up to 80 percent of all computer failures are power related. Computer failures are a security concern because they pose a barrier to a company's mission fulfillment. Removing noise from the electrical environment is one of the most important methods of improving a system's reliability. Power noise consists of electrical disturbances that downgrade the performance and shorten the life of any electronic system exposed to it. A reliable power conditioner should protect a system from all the effects of power-line disturbances. Four leading technologies for industrial power conditioning are isolation transformers, ferroresonant (constant-voltage) regulators, electronic tap-changing regulators, and low-impedance power conditioners. Four basic power conditioning functions are essential for a system to have total protection. One function is to reduce all power line disturbances to levels that are harmless to semiconductors; another function is to provide a clean, single-point, all-purpose reference ground for all loads connected to the conditioner; a third function is to prevent disruptive interaction between noise generating loads connected to the conditioner, and a fourth function is to provide peak current on demand without sacrificing efficiency or going into a bypass mode.