Nowadays aircrafts require more electrical systems. Functions usually carried out by mechanical, hydraulics or pneumatics systems are now carried out by electrical systems. Thus there is a densification of electrical systems. An aircraft electrical system is made of several electrical harnesses which are assemblies of cables and connective devices. A cable may contain one or several wires in a common covering. Thus wiring may be seen as a system of systems. In parallel, a link connects (functionally) equipments through harnesses.
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