Big Science organisations have a need for both standard and highly specialized electrical, electronics, and electromechanical installations and systems. This includes power supplies, transformers, installations, assembly and wiring work. Some organisations have an additional need for particular heating or particle acceleration systems based on RF (radiofrequency) or microwave generators with associated power supplies. In others radiofrequency amplifiers and associated power supplies are used to provide energy to particle beams, which are accelerated in normal conducting or superconducting resonators.