Group 1 One or more single core cables and insulated wires laid in duct i.e. PVC-sheathed single cores H 03 V../H 05.. and H 07 V.. according to VDE 0281.
Group 2 Multi-core cables, i.e. Light PVC-sheathed cables, flexible cables, metal-clad wiring cables in open or ventilated conduits (air).
Group 3 Single core cables for outdoor installation, laid in air with a spacing at least equal to cable diameter, such as single core wirings for switch-and distribution cabinets and rail line distributors.
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