Why are some plugs two pinned while others have three pins?

Answer 1

3-pin plugs have an additional earth wire connection, which means that if there is an accidental short circuit within the device, the electricity would be safely grounded, and will not electrocute the user of the device when he touches the device.

Thus 3-pin plugs are used for larger devices with (esp those with metallic covers) to provide a certain measure of safety for the user when there is a short circuit within the device.

Answer 2

No, they are actually not all as good as one yet another The third pin is a protection earth. whilst the three-pin accepted grew to become into settled in the united kingdom there have been very few "double insulated" home equipment so the earth connector grew to become into presented without question. the united kingdom equipment additionally makes use of shuttered sockets so little ones won't be ready to poke issues into the stay or impartial terminal holes. The Earth pin on plugs is longer than the L and N ones and it opens the shutters whilst the plug is pushed in. you will have observed that the cable get admission to on uk plugs is on the backside while on eu and US ones it particularly is often in simple terms "without delay in". that's planned layout so as which you will not eliminate the plug via in simple terms tugging on the twine. This prevents unintentional removing of the plug from the socket via an inadvertent short pull on the twine and, greater importantly - it prevents partial removing of the plug that should disclose stay pins.. the united kingdom government desperate that protection grew to become into greater significant than the small greater value of offering the earth connector and shutters. at the instant greater home equipment are "double insulated" so as that they don't desire an earth, yet they nevertheless might desire to have 3 pin plugs as a results of fact the earth pin is mandatory to open the shutters in the socket. In Europe (and north us of a) they desperate that value grew to become into greater significant than protection lots greater flimsy and decrease high quality 2 pin structures grew to become standardised. Later a third earth pin grew to become into further to 3, yet not all, eu and American sockets and plugs.

Answer 3

It is the fuse or circuit breaker which protects (the wiring) from short circuits, not the fact that an appliance may be earthed.

Earthing an appliance prevents the appliance becoming "live" in the event of certain types of fault.

Answer 4

It depends on if the appliance being used needs to be grounded. The third, round prong is the ground wire, usually for larger appliances.

Answer 5

two pin r for carrying AC current with one acting as the path for electrons and other neutral.... three also similar but for three phase current

Answer 6

2 pin doesn't have grounding :)

Answer 7

3 prongs are grounded