Electrical engineering - Basics Page 43

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Further cable characteristics are often printed on the cables themselves informing about e.g. nominal voltage, insulating and sheathing material, conductor type, wire type, etc...

All electric devices, cables and plug and socket connections have to cope with the VDE regulations and have to carry the VDE sign (see table under point "4. Symbols of electric components").

The CEE-norm which has been introduced in 1981 has the following advantages for three-phase current plug and socket connections:

The objective of the CEE-norm that it should not be possible to confuse plugs anymore is achieved with a special positioning of the earthing contact socket. Furthermore, the plugs have different colours and the earthing contact socket PE additionally has a larger diameter than the sockets for the poles of the outer conductors L1, L2 and L3 and the neutral conductor N.

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