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Electric power-distribution systems for computer rooms are usually designed by an electrical consultant and installed by an electrical contractor to insure maximum reliability. Grounding provisions provide personnel safety equal to or exceeding the requirements of the NEC. The computers and data-processing equipment are usually designed and installed by computer manufacturing companies or their contractors, in cooperation with the user-purchaser. The computer room installation often includes a raised floor, with power to computers, peripheral equipment, interconnections, computer cooling-air distribution, and a fire-extinguishing system all located under the floor. This is where the usual interfaces are accomplished and where problems frequently occur between the computer installation and the electrical distribution system powering the computers.