Before revision: Underwriters Laboratories required the adoption of the floating chassis, as isolation from the mains (the exact circuit and component values were not specified although the leakage current allowed was specified ) to limit the shock to a "safe" current level.
After revision: Underwriters Laboratories required the adoption of the floating chassis, as isolation from the mains (the exact circuit and component values were not although the leakage current allowed was specified ) to limit the shock to a "safe" current level.