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The neutral blade on 5-15P plugs is not always wider than the line blade, since the ground pin enforces polarity. The Electrical Safety Foundation International has stated: "Never remove the ground pin (the third prong) to make a three-prong plug fit a two-prong outlet". [18]
Double insulated appliances may omit the earth pin. When viewing a plug from the rear, and the earth pin downwards, the top left pin is active and the top right pin is neutral. The shank of the active and neutral pins of every 10 amp and 15 amp flat-pin plug sold after 3 April 2005 are required to be insulated, in accordance with AS/NZS 3112: ...
Three-prong plugs do not fit into the older, two-prong receptacles. [7] When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7]
Neutral is a circuit conductor that normally completes the circuit back to the source. NEC states that the neutral and ground wires should be connected at the neutral point of the transformer or generator, or otherwise some "system neutral point" but not anywhere else. [1]
Packaging in France of sockets is normally marked with correct connection of the cables. Polarised pre-fitted plugs on appliances are therefore connected with the brown line wire to the right pin and the blue neutral wire to the left, the earth being connected to the contact at the "top" of the plug.
For example, a 32 A 4-pin plug without neutral can plug into a 50 A 5-pin socket with neutral available. However a 10 A 5-pin plug cannot fit a 32 A 5-pin socket, as the plugs are in different groups and not only are their diameters different, but the position of the conductors also varies by a few degrees (for example the group 7/8 32 A plug ...
Where a "neutral" conductor exists in supply wiring, polarisation of the plug can improve safety by preserving the distinction in the equipment. For example, appliances may ensure that switches interrupt the line side of the circuit, or can connect the shell of a screw-base lampholder to neutral to reduce electric shock hazard.
This diagram shows the wiring of a British type G three pin plug. Externally it looks like this:en:Image:G plug.jpg: Date: 23 April 2011: Source: Traced from File:Three pin mains plug (UK).png: Author: Slashme: Other versions {Three pin mains plug (UK).png: