Lighting Circuits Connections for Interior Electrical Installations

Lighting Circuits Connections for Interior Electrical Installations

Introduction

Electrical lines which include lighting circuits begin from the main distribution panel of the installation and each line contains three conductors: phase, neutral and ground. All three conductors reach to the terminal point of each luminaire and if it has a metal chassis the ground should be connected in the appropriate position.

From each main distribution panel at least two lighting supply lines are leaving, so a failure on one line does not sink the entire installation in the dark. Insulation on the conductors must show the colors required by the regulations.

The phase conductor must be brown or black, neutral conductor must be light blue and ground conductor must be yellow/green.

To understand the circuit connections we can use various designs, including the following:

Single line diagram

Circuits shown are in the simplified form. These drawings show only the important elements of the lighting circuit and contain information on how to layout, number of the conductors and their cross – section.


Analytical diagram

Which show all the lines that connect the different parts of a circuit. These plans in large scale circuits can lose their figuration.


Operating diagram

Which show in detail the paths of electrical current. This method of design is descriptive and easy to read.

1. Simply light circuit

Description:

Connection of one or more luminaire points (Lights) controlled by a simple switch. This kind of connection is used in almost all interior electrical installations.


General diagrams

Single line diagram

Simple light circuit - Single line diagram

Simple light circuit - Single line diagram


Analytical diagram

Simply light circuit - Analytical diagram

Simply light circuit - Analytical diagram

Operating diagram

Simply light circuit - Operating diagram

Simply light circuit - Operating diagram


Important Note:

In all lighting circuits a ground cable must be installed. Usually the luminaires for residential use belong in the next two categories:

  • Protection Class I: The device is grounded. The ground wire (yellow / green) must be connected to the clip marked with ground symbol.
  • Protection class II: The device is double insulated and cannot be connected to the ground.

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2. Selector switch lighting circuit (Comitater)

Description:

A connection of two groups of lamps controlled by a single point. The connection is usually used in chandeliers.


General diagrams

Single line diagram

Selector switch lighting circuit - Single line diagram

Selector switch lighting circuit - Single line diagram


Analytical diagram

Selector switch lighting circuit - Analytical diagram

Selector switch lighting circuit - Analytical diagram


Important Note:

During the design of various electrical circuits we pay attention to draw them in break mode (OFF), unless there are compelling reasons to the contrary. Above the circuit is ‘closed’, feeding all the lights.


Operating diagram

Selector switch lighting circuit - Operating diagram

Selector switch lighting circuit - Operating diagram


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3. Two-way switching lighting circuit (Two extreme switches Aller–Retour)

Description:

Control of a lighting circuit from two points (A and B). This type of circuit is used in hallwaysrooms with two entrances, stairs, bedrooms, e.t.c.


General diagrams

Single line diagram

Two-way switching lighting circuit - Single line diagram

Two-way switching lighting circuit - Single line diagram

Analytical diagram

With rotary switches

Two-way switching lighting circuit - Analytical diagram with rotary switches

Two-way switching lighting circuit - Analytical diagram with rotary switches


With pushbutton switches

Two-way switching ighting circuit - Analytical diagram with pushbutton switches

Two-way switching ighting circuit - Analytical diagram with pushbutton switches

Operating diagram

With rotary switches

Two-way switching lighting circuit - Operating diagram with rotary switches

Two-way switching lighting circuit - Operating diagram with rotary switches


With pushbutton switches

Two-way switching lighting circuit - Operating diagram pushbutton switches

Two-way switching lighting circuit - Operating diagram pushbutton switches


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4. Switching lighting circuit (Aller–Retour) with two extreme switches and one or more intermediate switches

Description:

Control of a lighting circuit from three or more points. This type of circuit is used in large roomslong corridors, staircases and generally in large rooms.


General diagrams

Single line diagram

Switching lighting circuit - Single line diagram

Switching lighting circuit - Single line diagram


Analytical diagram

Switching lighting circuit - Analytical diagram

Switching lighting circuit - Analytical diagram

Operating diagram

Switching lighting circuit - Operating diagram

Switching lighting circuit - Operating diagram


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5. Lighting circuits with fluorescent tubes

Description:

  1. Circuit of a 40W fluorescent tube, with 40W Ballast and starter.
  2. Circuit with two fluorescent tubes (20W each), with 40W Ballast and two starters (20W each)

The fluorescent tubes are used particularly in factories, offices, for decoration and advertising or promotion of goods. In recent years fluorescent tubes are used in residential installations.


General diagrams

Single line diagram

Fluorescent tubes - Single line diagram

Fluorescent tubes - Single line diagram


Important Note:

In figure b) we can add more fluorescent tubes if we want in series but we should also add more starters and a more powerful ballast.


Analitycal diagrams

Fluorescent tubes - Analytical diagram

Fluorescent tubes - Analytical diagram

Operating diagrams

Fluorescent tubes - Operating diagram

Fluorescent tubes - Operating diagram


Important Notes:

In figure 2) If one of the two starters or one of the two lamps stop working, then none of the lamps will eventually function.

The metal chassis of the lamp or the ballast’s choke should be grounded. The fluorescent tubes import reactive power to the grid. With new European Union directives, mechanical ballasts are repealed and only electronic ballasts (triac) should be used, which limit the reactive power.

The starter and the capacitor are abolished and we have direct ignition of the lamp.

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author-pic

Emmanouil Angeladas - Bachelor in Electrical Engineering from Technological Educational Institute of Piraeus, Hellas. Electrical engineer working at Center of Renewable Energy Sources. I work in the field of maintenance, functional test and installation of measuring systems, including wind potential measurements in areas where wind turbines will be installed. I'm highly interested in HVDC systems, Fuel Cells technology and Microgrids.



13 Comments


  1. calibre
    May 07, 2014

    Hello,

    Very usefull website! Can you tell me in what software program the diagrams are made?

    Thanks!


    • Emmanouil Angeladas
      May 07, 2014

      Microsoft Visio


  2. Dr. Eng. Ihsan Bawadekji
    Dec 19, 2013

    Thanks for you valuable efforts.


  3. hardyparvaiz
    Feb 05, 2013

    Useful Site.

  4. [...] / Technical Articles / Lighting Circuits Connections for Interior Electrical Installations (3) Lighting Circuits Connections for Interior Electrical Installations (3) Posted Jan 2 2013 by Emmanouil Angeladas in Energy and Power, Lighting with 0 Comments Translate [...]

  5. [...] Light switch for interior installation Continued from first part: Lighting Circuits Connections for Interior Electrical Installations Introduction; In modern internal electrical installations, domestic and professional, there is a need [...]


  6. vnnhan
    Dec 26, 2012

    I am very happy to join EEP, I have learned a lot. Thanks very much..


  7. engr.sahir
    Dec 12, 2012

    I am happy to join the EEP and have to learn alot.


    • Edvard
      Dec 12, 2012

      Welcome Sahir! Glad to have in the EEP team!


  8. Edvard
    Dec 07, 2012

    Excellent overview of lighting connections. Just keep on!!

    Best regards


    • Emmanouil Angeladas
      Dec 07, 2012

      Thanks a lot Edvard…


  9. Bipul Raman
    Dec 07, 2012

    Dear Emmanouil Angeladas,
    Welcome to our EEP family..!!!!


    • Emmanouil Angeladas
      Dec 07, 2012

      Hello Bipul Raman, i feel great that i belong to EEP. All of your technical articles inspired me to become a contributor.

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