Applies to double wound transformers intended for use in stepping-up the voltage to electric discharge systems designed to produce visible or ultra-violet radiations. It also applies to auto-transformers used for stepping-up and controlling the voltage for cold-cathode fluorescent lamps and sterilizing lamps, but not including sodium-vapour and mercury-vapour lamps. Capacitors for use with electric-discharge lamps and lighting systems are dealt with in a separate specification.
