By "electrical cabinet" we mean a coordinated set of support elements (mechanics), control, protection, measurement, signalling, regulation, connection, etc. devices, aimed at performing certain functions necessary for the operation of the electrical system.

Electrical Power Cabinet consists of one or more busbar systems with the equipment needed for the operation the lines connected to them.

They can be:

• Low voltage ( L.V.);
• High voltage (M.V. e H.V.);

They contain the power circuit equipment:

• Fixed switches;
• Main disconnectors;
• Disconnectors and earthing devices;
• Transformers T.V. e T.A.;
• Cable terminals;
• Carrying and bushing insulators;
• Rigid and flexible connections;

They can also contain:

• Auxiliary circuit components;
• Command and maneuver equipment;
• Measurement tools;
• Protection relay;
• Alarm circuits;
• Consent and block circuits;