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Typically the number of poles represents the number of sources being switched. In a normal household ON/OFF light switch the single pole is the HOT wire (Black). The most common single pole switch is also single throw. The ON/OFF switch described above. This switch is abbreviated SPST. You could also have a single pole double throw switch (SPDT). and other variants on the same theme. The term gang is usually used to describe multiple switches in the same electric box. For example, if you had 3 switches together with a single switch plate, the switch plate would be described as a 3-gang switch plate.
A one gang switch is like an ordinary switch box in your home. When there is more than one box, the electrical terminology used is ganging the boxes together. Two switches side by side in a single box is expressed as a two gang box. Three switches side by side in a single box is a three gang box. A single phase circuit is a circuit that gets is supply voltage from a single phase supply system. In North America the single phase supply voltages are 120/240 volts. A single phase circuit can also be supplied from any two legs of a three phase system. The most common voltages in North America from a three phase system are 120/208 volts.
3 gang switch and you can call it 2-way switch..is a type of swithces we are using mostly in the stairs lighting ,that mean you have switch up to the stair and one down to the stair and you can switch the light on from one and switch it off from the other switch and via verse. <<>> There is no such thing as a three gang three way switch,. The nearest thing is a three gang double throw switch. It is used to supply a three phase load from two individual three phase supply sources. This is the type of manual switch that can be used for emergency power switch over from utility to generator. Three way switching uses a single pole double throw switch at each end of the circuit and a cross over switch in the center position. The center switch in a three way lighting configuration is a cross over switch and a double pole double throw switch in that position will not work.
A two gang switch box is a box that can have two switches installed in it. Or a switch and a receptacle or two receptacles. The standard sizes of gang boxes are from two all the way up to a four gang. If more that four switches have to be ganged together, they can be custom ordered to any amount that you need.One installation where two gang box could be used is in the bathroom where one switch is used for the light fixture and right beside it in the same box a switch for the bathroom fan.
For countries in Europe and other world areas running a 50 Hz supply service.A double gang wall socket has two outlets so you can plug two appliances into it.A single gang wall socket has only one outlet, so you can plug just one appliance into it.Note: You can plug a two-way adaptor into any socket outlet but this is only safe to do if the appliances you want to use take very little power. Such things as table lamps, a television and a hi-fi, a PC and a printer, etc. are all low-power appliances so they can be used safely with a two-way adaptor.If you need to use more than two low-power appliances in a room that only has a single gang or a double gang wall socket then, for safety, you must use a multi-way socket panel. Such a multi-way panel has a cable with a plug so it can be plugged into any wall socket outlet.Such multi-way panels are available from hardware stores and usually have between 2 and 8 socket outlets on them. Such a multi-way socket panel should always include a fuse to prevent all the appliances plugged in to it from overloading the wall socket.For USA, Canada and other countries running a 60 Hz supply service.Generally speaking when you say single gang or double gang, a single gang is two sockets and a double gang is wider and accomodates four sockets. You wouldn't normally say single gang socket. You would say single gang box or single gang face plate. which would be two sockets not one.
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