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

Similarly, your house's wiring system includes both hot and neutral wires. The system of hot and neutral wiring is what is meant when we speak of a house's electrical system as being "polarized." It simply means that there are both neutral and hot wires and that there is a directional flow to how the current runs through the system.

www.answers.com/Q/Polarized_plug_which_wire_is_hot

What you are refering to is a polarized plug. The wide connector forces the proper orientation in the outlet. This is so that the hot and neutral connectors in the plug, match the hot and neutral ...

www.familyhandyman.com/electrical/electrical-repair/fix-a-lamp-cord

This means the plug has a small blade for the hot wire and a wide blade for the neutral wire, and the wires feeding those blades should not be reversed when you put a new plug on. Always use a polarized plug for a lamp, extension cord or any other cord that’s polarized to begin with. Don’t ever use a nonpolarized replacement plug with same ...

www.hunker.com/12536777/how-to-know-which-is-the-hot-wire-in-a-two-wire-plug

A two-wire plug uses a type A outlet. These outlets are the older version of the current type B outlet. Type B was created to provide a connection for an electrical safety system. The type A plug has two flat parallel prongs and can fit in both styles of outlets. The two prongs provide a hot and neutral electrical connection.

en.wikipedia.org/wiki/Polarized_plug

The plugs have three round pins arranged in a triangle, with the larger top pin being the earthing pin. The plugs are polarized and unfused. Plugs are non-interchangeable between current ratings. Introduced in 1934, the BS 546 type has mostly been displaced in the UK by the BS 1363 standard.

www.familyhandyman.com/electrical/electrical-repair/wiring-a-plug-replacing-a...

Wiring a new plug isn’t difficult, but it’s important to get the hot and neutral wires connected to the proper prongs. The danger isn’t fire. The worry is that a miswired plug poses a fairly serious shock hazard. The key is to make sure you connect the wires to the proper terminals in the plug ...

hyperphysics.phy-astr.gsu.edu/hbase/electric/hsehld.html

The wider prong on the polarized plug will permit it to be plugged in only with the correct polarity. The narrower prong is the "hot" lead and the switch to the appliance is placed in that lead, gauranteeing that no voltage will reach the appliance when it is switched off.

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.

answersdrive.com/is-polarized-plug-hot-or-neutral-3078971

A polarized plug will have one prong wider than the other, which is the neutral, and usually silver-colored prong. The hot prong will be narrower and usually gold colored. With a non-polarized plug, you can wire either wire to either prong.