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Finger protection from accidental contact with plug pins by provision of an over hang around the pins of the plug.
Provision of protective cap / cover for Socket when not in use.
Contact tubes of socket deeply recessed to prevent finger contact.
Provision of scraping earth. The earth connection makes first & breaks last.
Visible earth terminal for ease of checking earth connection.
Rubber cable guard in the plug for protection of incoming flexible cable.
Non reversible i.e. different circuits cannot be accidentally interconnected.

