For added protection, the manufacturer offers a warranty against damage from power surges that come through the home's electric meter after passing through a failed arrester. It only takes our serviceman a half hour to install the device. During this time the power to the home must be off. That takes care of electrical disturbances from outside the house. For these kinds of surges, we recommend a plug-in surge suppressor connected to each piece of electronic equipment.
Surges can also come from ground wires connected to water pipes or telephone and cable TV lines.
For the warranty to be effective, equipment must be connected to the device and building wiring and other connections to protect equipment must conform to applicable NEC code.