Wiring system

A wiring system, comprising

• a main wire-side wiring member including at least one main wire-side circuit and a main wire-side connector to which the main wire-side circuit is connected;
• and
• an apparatus-side wiring member including an apparatus-side connector connected to the main wire-side connector and at least one apparatus-side circuit having one end connected to the apparatus-side connector and another end electrically connected to an electrical apparatus, wherein
• at least one of the main wire-side circuits is an aluminum wire,
• at least one of the apparatus-side circuits is a copper wire connected to the aluminum wire via the apparatus-side connector and the main wire-side connector,
• the main wire-side wiring member includes a plurality of electrical wires each constituting the main wire-side circuit,
• when an electrical wire group made up of only electrical wires having a cross-sectional area of 0.13 sq or less is a thin electrical wire group, and an electrical wire group made up of only electrical wires having a cross-sectional area larger than 0.13 sq is a thick electrical wire group based on a conductor cross-sectional area, the plurality of electrical wires include electrical wires constituting the thin electrical wire group and electrical wires constituting the thick electrical wire group,
• the thick electrical wire group includes the aluminum wire, and
• a ratio of the aluminum wire is equal to or higher than a ratio of a copper wire in the thick electrical wire group.