Low-voltage electrical installations. Part 5-54. Selection and erection of electrical equipment. Earthing arrangements, protective conductors and protective bonding conductors
Medical electrical equipment. Part 2-51. Particular requirements for safety, including essential performance, of recording and analyzing single channel and multichannel electrocardiographs
Low voltage surge protective devices. Part 21. Surge protective devices connected to telecommunications and signalling networks. Performance requirements and testing methods
