Electrical socket (1) for providing an alternating voltage of a supply network, with a completely closed socket housing (2) for mounting the socket (1) on a flat surface, the socket housing (2) having a recess (4) in a housing front (3) Receiving a plug which is defined in the radial direction by an inner wall (5) and in the plug-in direction of the plug by a base plate (6), the base plate (6) having two socket openings (7a, 7b) for introducing corresponding contact pins of the plug to their electrical connection with sockets (45a, 45b) of supply contacts (43a, 43b) in the interior of the socket housing (2), characterized in that the inner wall (5) has a completely circular-cylindrical inner contour and the base plate (6) has a further socket opening (7c ) for the simultaneous introduction of a grounding pin of the plug for its electrical connection with the contact pins a socket (45c) of a grounding contact (43c) in the interior of the socket housing (2) and an insertion opening (7d) for the optional insertion of a removable grounding pin (9) as an optional part of the socket (1), which when inserted from the base plate (6) protrudes against the direction of insertion of the plug and is electrically connected to the ground contact (41c).
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