7.12.2 - High voltage discharge lighting

Earlier versions of the 15th Edition of the Wiring Regulations included detailed requirements for high voltage discharge lighting circuits, which almost always means neon sign installations. The Regulations have now omitted most of this detail, which is contained in BS 559. Any electrician who will be concerned with the high voltage aspects of such installations should therefore take expert advice, which is likely to include making reference to the BS.

Low voltage wiring to feed the transformers in this kind of installation is similar to most other installations except that special requirements apply to the Fireman's Switch which controls the installation and allows the fire service to make sure that high voltages have been isolated before playing water on the system. These special requirements have been covered in {3.2.2} and will not be repeated here.