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community.ebay.com/t5/Archive-Vintage/Electric-plugs-become-polarised-when...

Does anyone know the date when the polarized plugs began being used in the US? I'm trying to narrow the dating down on a lamp. This lamp also has a switch which is red on one side and black on the other. The glass is by LE Smith, but I don't know who produced the final product. All help greatly appr...

en.wikipedia.org/wiki/History_of_AC_power_plugs_and_sockets

The earthed consumer plug has several claimants to its invention. In Britain, a 1911 book dealing with the electrical products of A. P. Lundberg & Sons of London describes the "Tripin" earthed plug available in 2.5 amp and 5 amp models. The pin configuration of the "Tripin" appears virtually identical to modern BS 546 plugs.

en.wikipedia.org/wiki/Polarized_plug

AC power plugs and sockets connect electric equipment to the alternating current (AC) power supply in buildings and at other sites. Electrical plugs and sockets differ from one another in voltage and current rating, shape, size, and connector type. Different standard systems of plugs and sockets are used around the world.

www.answers.com/Q/When_did_polarized_plugs_come_out

Polarized plugs actually came out in 1914. They were never well accepted, so, here is what I can tell you. If you have an old lamp pay more attention to the cord and the socket. When polarized ...

www.thespruce.com/polarized-electrical-plug-explanation-1908748

These are unpolarized plugs. Older lamps and other devices may well have unpolarized plugs, and some modern electronic devices, such as chargers on computers or cell phones, also have simple unpolarized plugs. It is generally not a problem to plug in an unpolarized plug to a polarized outlet in whatever way it will fit.

www.hunker.com/13414330/polarized-vs-nonpolarized-power-cords

A nonpolarized power cord has prongs of the same size. A polarized power cord has prongs of different sizes. You can only use a polarized plug with a polarized outlet. Polarization is a way of making sure a switched light or appliance isn't energized and can't shock you when the switch is off.

blog.1000bulbs.com/home/polarized-vs-non-polarized-electrical-plugs

Plugs with the two of the same-sized prongs are considered non-polarized because there is no clear distinction as to which prong is for the “hot” side and the “neutral” side. When older devices with a non-polarized two-prong design are inserted into a non-polarized outlet, the polarity (directional flow of the current) would be reversed.

www.doityourself.com/stry/how-does-a-polarized-plug-work

Polarized plugs work as a safety mechanism to prevent electrical shock if you touch an energized part of the appliance. They come in two forms: plugs with two prongs of different sizes and plugs with two flat prongs and a third circular prong underneath.

www.amazon.com/non-polarized-plug/s?k=non+polarized+plug

Legrand - Pass & Seymour SA440BKCC10 Residential Non Polarized Plug 15-Amp 125-volt Straight Blade, Black. 3.5 out of 5 stars 54. $5.96 $ 5. 96. Get it as soon as Thu, Nov 14. FREE Shipping on orders over $25 shipped by Amazon. Amazon's Choice for non polarized plug.

community.ebay.com/t5/Archive-Vintage/What-is-polarized-plug/td-p/1765223

I have noticed on discussions regarding vintage lamps the use of the term polarized plug. What is a polarized plug? When did they start using polarized plugs? I love to buy vintage lamps, usually with intent of selling them on ebay but then I cannot part with them!! I am unaware of this term and it ...