Enger Ahmed Nour Ibrahiimi

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Common MEP Engineering Services

Heating, Ventilating, and Air Conditioning Systems.
Central Plant Design.
Exhaust Systems.
Direct Digital Control (DDC) Systems.
Chilled Water Systems.
Heating Water Systems

Hi, today I'd like to talk about one of the most important topics for designers which is lighting control.
before you continue reading bring a cup of coffee and enjoy.
I will explain the most common types of switches used for domestic purposes in this post.

1. one way one gang switches:
Explaining gang:
"Gang" describes the number of switches on the plate. They are sometimes called rockers, throws, or dimmers, depending on how they operate, but still, they just refer to the number of light switches on the plate. It is possible to get more, but it is very uncommon to have more than three in a domestic setting this would be called a 3 gang switch.

If you have a dimmer switch they are described in the same way; a 1 gang dimmer switch will have a single dimmer on the plate, and a 2 gang dimmer switch will have 2 dimmers, and so on.

A 1 gang switch will control a single lighting circuit, and with a 2 gang switch, you can control two lighting circuits, and so on. However if you need two switches to control a single lighting circuit, such as in the case of at the head and foot of stairs so you can switch the lights on and off in both places, you need to understand a 2 ‘way’ switch.

It is also possible to install or fit a variation on the theme by combining dimmer and "throw" switches on the same plate. You are then able to set the light to the required ambiance and turn it on and off. The ambiance setting is remembered by the switch but can be altered just like any other dimmer.
explaining way:
light switches can only be one of two things; a one-way switch or a two-way switch.
A one-way switch has two terminals, it's the simplest of switch arrangements. it’s either on or off, that's all it does. When it’s ‘ON’ the COM terminal is connected to the L1 terminal (let there be light!). When it’s off the COM terminal is connected to nothing and (the switch is open) no current flows through the switch.
A two-way switch has three terminals it's a little more complicated than a one-way. When it’s ‘ON’ (position 1) the COM terminal is connected to the L1 terminal. But when it’s ‘Off’ (position 2) the current is diverted from the L1 to the L2 terminal. This is what we use in circuits when we want to be able to switch a single light on and off from two different switches.

If we have a switch with on gang it can have a switch mechanism that is either one or two ways
so, we have two possible options:
single gang one-way switch.
single gang two-way switch.

If we have a switch with two 2 gangs it can have a switch mechanism that is either one or two ways so we have two possible options:
1. double gang one-way switch.
2. double gang two-way switch.

hope all is clear till now! let us continue.

one-way one gang switch:
If a light switch is ‘1 way’ this means it is just an on/off switch. This is the simplest type of switch that you can get. The single switch controls a single light (or lighting circuit).
or in another way this switch allows you to control a single bulb ( outlet ) or group of bulbs from one location by one gang as shown in photo no.1
( here comes a very important question comment below and tell me what you think
about the question the first terminal is the live wire what about the second terminal should you connect a live wire or neutral or you could connect both? )

2. one way two gang switch: photo no.3
this switch allows you to control a single outlet or group of outlets from one location by two gangs each gang controls one group.
Each of the gangs works like this: when the switch is ‘on’ the COM and L1 terminals are connected together.
When ‘off’ the COM is connected to nothing.
but there are no connections between the two gangs. Each gang is a single discreet switch.

3. two way one gang: photo no.5
a two-way switch means there is another switch controlling the same light. These are often used on a staircase, a large room with switches by each door.

4. two way two gangs:
same as previous.
This switch arrangement is basically two two-way switches on a single-face plate.

5. Intermediate switch: photo no.6
If you need to control the lights from three places, say you have three entrances to a large room and need a light switch next to each one, you will need an intermediate switch. The light(s) can be switched on and off from any one of three places.

6. dimmer switch: photo no.7
allows you to control the brightness of your lights by rotating the k**b.
notice not all bulbs are dimmable.

7. push button switch: photo no.10
by applying pressure or pressing on this switch by your figure energize the circuit and by removing the pressure de-energize the circuit.
the most common application for this home doorbell.

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