to wire a lamp to be controlled from three places you need two three way switches and one four way switch. the two traveller wires that would normally run between the two three way switches must be connected to the terminals of the four way switch
A three way switch is use control in two station of the lamp
An intermediate switch is a switch of 4 terminals which is used to control devices from more than 2 locations. If you want to control a device (eg. lamp) from one location you use a normal switch, you could see two terminals behind it. If you want to control from two locations you use a 2-way switch (3-way in American vocabulary), you could see three terminals behind it. But if you want the device to be controlled from more locations, you need to use what is called the "Intermediate Switch". It is to be used in conjunction with other 2-way or intermediate switches. Technically speaking, an intermediate switch is similar in structure to a Double Pole Double Throw (DPDT) with the throw contacts of a pole is interconnected to that of the other pole. Consider the stairs of a G+2 storey building. You usually have three switches -one on Ground floor, second switch on the first floor and the third on the second floor, isn't it? You need to turn-on & off the light from all locations. Then, you need to use an intermediate switch in between two 2-way switches (Can also use all three intermediate if economy doesn't matter). If you require switches in 5 locations, go for two 2-way switches in the first and last points and three intermediate switches in the rest of the locations. In each intermediate switch you could see two sets of terminals. The two wires coming from one direction is connected to one set of terminals and new two wires are connected to the other two terminals and taken to the next switch in line. Also see section 5 of http://en.wikipedia.org/wiki/Switch
A two way switch is UK terminology for a North American three way switch. Though the switch has two names it is still a Single Pole Double Throw switch that has three terminals. North American terminology. The circuit is the same as the three way switch system. To control from four locations just add another intermediate switch. For the system to work properly the new intermediate switch has to be adjacent to the existing intermediate switch. The connections must run - three way, intermediate, intermediate, three way.
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You build an electronic device to control a transistor switch that causes a mechanical device to push the switch. Now days we bypass the mechanical switch and the circuit can do the switching.
by installing switch you can control the broadcast
The Kinase-enzyme class of enzymes. They, collectively and solely, control all Cellular processes by phosphorylating - switching ON - control elements and de-phosphorylating - switching OFF - other control elements.
Time division space switching:-suppose there are 'n' input lines and 'n' output lines connected to the bus each via switches.The switches being controlled by the decoder using the counters and control memory etc.So in the most basic form there is a counter connected to an n to 2^n decoder which controls the connection of the input and the output line to the bus.2 basic types are:input controlled time division switchingoutput controlled time division switching
to control the flow of air fuel mixture
D. Shyy has written: 'Information switching processor (ISP) contention analysis and control' -- subject(s): Switching circuits
switch gear is apparatus used for switching,controlling and protecting the electrical circuit and equipment. MCC (motor control centers) is switch gear cabinet single operator panel.motor control centre groups of motor controllers and related devices in a compact structure.MCC is a bunch of motor feeders from where you can control power to connected motors.that's why it is called motor control center.
switching
uncheck welcome center and fast user switching in the control planel
a dog that has a remote control cable connected to it
In circuit switching there is also some required overhead; the overhead in packet switching is usually a small percentage of the total traffic; and in any case, the benefits of packet switching far outweigh any disadvantage of some minor overhead.
A three way switch is use control in two station of the lamp
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