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Edison Screw (ES) Socket

An Edison Screw (ES) socket is a type of light bulb socket commonly used in Australia and around the world. The ES socket is named after Thomas Edison, who developed the design. It features a threaded metal base that allows the bulb to be screwed into the socket securely.

In Australia, the Edison Screw socket is governed by the AS/NZS 3111 standard, which ensures safety and compatibility with electrical systems. The most common sizes of ES sockets used in Australia are the E27 and E14 types. The E27 socket, also known as the “standard screw,” has a 27mm diameter and is used for most standard light bulbs. The E14 socket, often referred to as the “small screw” or “SES” (Small Edison Screw), has a 14mm diameter and is typically used for smaller decorative or appliance bulbs.

Edison Screw sockets operate at the standard Australian mains voltage of 230-240V AC. When installing or replacing ES sockets, electricians must ensure proper wiring and compatibility with the light fixtures and bulbs being used.

Although the Bayonet Cap (BC) socket is more common in Australia, ES sockets are widely available and often used in imported light fixtures. Electricians should be familiar with both types of sockets to accommodate various customer needs and preferences.


Edison screw or bayonet cap!