This chapter contains specifications for existing work, transformers, aggregates, converters, accumulators, no-break systems, prefabricated transformer stations, ducts, pipelines and hoses, feed-throughs, switching and distribution equipment high and low voltage, busbar systems, measuring instruments, switches, sockets high and low voltage, voltage rails, lighting fixtures, light sources, heaters and cables and earthing and lightning conductor materials. Below you will find manufacturers, suppliers and service providers who are involved in this.