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.
Both the polarized and non-polarized 2-prong household plugs will fit into your 3-prong, standard household outlet/receptacle. To learn more about plugs and receptacles read our preview post here. The hot pin on a polarized plug is the smaller of the two pins and is connected to the black wire on the inside of your plug and cable.
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.
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.
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Take a look at obvious toaster example: If you live in Europe and have non-polarized plug and a toaster (a bad one without double-pole turn off) - you have a 50% chance of touching the hot wire (via the heating elements or even bread if you're unlucky) if you plug it in the wrong way, so that the off switch turns off just the neutral wire.
Learn How Circuits Are Grounded and Polarized Learn How Circuits Are Grounded and Polarized ... If the receptacle or plug is not polarized or if a receptacle is wired incorrectly, the switch controls the neutral wire. This means that power is still present in the wires inside the light or appliance when you turn it off, posing a safety hazard. ...
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 ...
Japan, Philippines Travel Adapter Plug bu Ceptics - USA 3 Pin Polarized to 2 Prong Unpolarized - Type A (3 Pack) - Dual Inputs - Ultra Compact - Perfect for Cell Phones, Tablet, Camera Chargers (CT-6)