Editing AC power plugs and sockets (section)

=== Lampholder plug ===
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File:Lampholder plugs.jpg|Italian bypass lampholder plugs with Edison screw mount.<br />Left: early type (porcelain and brass, c. 1930).<br />Right: late type (black plastic, c. 1970)
File:Lampholder plug adapter.jpg|Lampholder plug (US, c. 1950–1960)
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A lampholder plug fits into a light socket in place of a [[Electric light|light bulb]] to connect appliances to lighting circuits. Where a lower rate was applied to electric power used for lighting circuits, lampholder plugs enabled the consumers to reduce their electricity costs.<ref>{{cite web |url=https://www.worldstandards.eu/electricity/history/why-no-universal-plug/ |title=Why isn't there a universal standard electric plug? |website=WorldStandards.eu |access-date=13 December 2024}}</ref> Lampholder plugs are rarely fused. Edison screw lampholder adaptors (for NEMA&nbsp;1-15 plugs) are still commonly used in the Americas.
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