Air-core coils are mounted on a module substrate using a bulk feeder.

All the water outlets are connected to a common pressurised water supply.

The circuit includes a plurality of light sources, for instance light emitting diodes, connected to a common power supply.

Modules may be interconnected to build a uniform lamp of some length with one common power supply.

A power distribution apparatus to control the supply of electrical power to a suite of master and peripheral devices, the apparatus comprising a master electrical outlet and at least one slave electrical outlet, both connectable to a common power supply.

Additionally, the system can have a common power supply system that supplies power in any desired proportion to a plurality of induction furnaces.

To this end, the invention provides that the fluid burner has a number of individual burner modules with a common fluid supply.

The use of diesel generators as a common or standby power supply is one of the most convenient power solutions.