This Standard sets out requirements for telecommunications ELV d.c. power supplies used by licensed public telecommunications carriers in the provision of public telecommunications networks where—(a) the carrier owns the d.c. power supply; (b) the d.c. power supply is located in a restricted access location; (c) the d.c. power supply is located in premises and land that are owned, leased or otherwise occupied in whole or in part by the telecommunications carrier; and (d) the power supply has a battery with a nominal rating of 2 A.h. or greater at the 10 h rate. It specifies the minimum requirements for personal safety and safety from fire while maintaining the viability of the public telecommunications network.