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Home » Electrical Wiring (Basic for Home) » What is Intermediate switch, its construction, working principle and uses in different wiring (lighting etc) circuits?

# What is Intermediate switch, its construction, working principle and uses in different wiring (lighting etc) circuits?

## What is Intermediate switch, its construction, working principle and using in different wiring (lighting etc) circuits?

### What is Intermediate switch , its construction and how it works?

There are four terminals in intermediate switch by which it changes the flowing of current from one circuit to another circuit (fig1). It’s ON and OFF the supply by two ways.   The four terminals of intermediate switch is shown in fig 1 label as A, B, C, D. In some cases, the terminal  contacts of switch is meet  terminal A with terminal C and terminal B meet with terminal D as shown in fig 1 a.
click image to enlarge.

In other cases , the terminal  contacts of switch is meet  terminal A with terminal B and terminal C meet with terminal D as shown in fig 1 b.
When the knob of the switch is UP, then the vertical contacts are meeting (i.e. AC and BD as shown in fig 1a). And when the knob is DOWN, then the Horizontal contacts are meeting (i.e. AB and CD as shown in fig 1b).

### Application and Uses

This kind of switch is used in a hall, big rooms or Godown where different lamps are require to ON/OFF from different places. Moreover, in a multistory building, the lamp at ground floor, in car parking shade can be controlled or ON / OFF from any floor by using intermediate switch circuit.
In Fig 2, a lamp is controlled from three different places by using two, 2-way switches and one intermediate switch.
fig 2…click image to enlarge

In fig 3, a lamp is controlled from six different places by using two, 2-way switches and four intermediate switches.
fig 3…click image to enlarge
Key Point: You can control a lamp from many different places by adding more intermediate switches.

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## Different Types of Wiring Systems and Methods of Electrical Wiring

Methods of Wiring And Different Types of Wiring Systems  Methods of Electrical Wiring Systems w.r.t …

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4. Lucky Joestar

This is what we Yanks call a “four-way” switch.

5. thank a lot this blog

6. This web is very useful to us

7. Your giagram misspells intermediate in two places and leaves out the ‘i’ in ‘posItion.

8. You diagram uses two different misspellings of intermediate just as my first email misspelled diagram. Position is missing the ‘i’.

9. Basic stuff not worth pulishing