Why is one pin bigger in a 3 pin plug?

The earth pin is long so that the earth connection is made first. This ensures the safety of the user because if the appliance is defective, the fuse will blow off. The earth pin is made thicker so that even by mistake it cannot be inserted into the hole for the live or neutral connection of the socket.

Why one pin on the plug is bigger?

Why it is Longer? The earth pin should be the first to connect and the last to disconnect with electric supply. This is why earth pin is longer than the live and neutral pin on 3-pin plugins. The earth pin is the last to disconnect from the socket when removing the plug from the socket.

Why has the pin got a hole and a small screw on one end?

Some taper pins have a male screw thread on the small end that is designed to project through the hole and retain the pin with a washer and a nut. Other pins are threaded on both ends, on the thick end to pull the pin out with the same nut that holds the pin in place.

Why is the size of the earth pin different from the other two pins?

Among these three pins (live, neutral and earth), the earth pin is made longer and thicker than the other two pins, so that when we insert the plug into the socket, the earth pin comes into contact with the power supply before the other two pins, this is because if any unwanted charges are there then they will be …

Why do two pin plugs not have an earth?

The vacuum cleaners and electric drills do not have an earth wire. They have plastic casings or they have been designed so that the live wire can’t touch them. Even if the wires inside become loose, the casing can’t give an electric shock.

Why do some plugs have different size prongs?

A commonly asked question is ” Why does my 2-prong style plug have different sized metal pins?” (Shown in the image below.) The answer is because it is polarized. The larger of the two pins are connected to the white wire and the grounding pin on a 3-prong plug is connected to the green wire.

Why is there a hole in the plug?

These bumps fit into the holes so that the outlet can grip the plug’s prongs more firmly. This detenting prevents the plug from slipping out of the socket due to the weight of the plug and cord. There also is a small savings in raw materials (metal) for the manufacturer of the actual plug prong.

What are the 3 holes in socket?

An outlet has three holes. The first hole, or left hole, is called “neutral”. The second hole, or right hole, is called “hot”. The third hole is the ground hole.

What is a screw hole called?

That is simply called a threaded insert.