plug, three-pin

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Insulated device with three metal projections used to connect the wires in the cable of an electrical appliance with the wires of a mains supply socket. In the UK, plugs have pins of rectangular section, and must comply with the British Standard BS 1363 laid down by the British Standards Institute. A plug must be designed carefully with regard to construction, labelling, clearance between components, accessibility of live parts, earthing (see earth), and terminal design. Before being approved, it is tested for the resistance of its insulation, temperature rise while in use, anchorage of cables, mechanical strength, and susceptibility to damage by heat and rust.

The red, white, and black tricolour formed the basis of the flags of both North and South Yemen. Effective date: 22 May 1990. >>