lighting circuits connections for interior electrical installations
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Simple lig ht circuit - Single line d iagram
To understand the circuit connections we can use various designs, including the following:
Single line diagram
Circuits shown are in the simplif ied fo rm. These drawings show only the important elements of the lighting
circuitand contain inf ormation on how to layout, number of the conductors and their cross section.
Analytical diagram
Which show all the lines that connect the dif f erent parts of a circuit. These plans in large scale circuits can
lose their f iguration.
Operating diagram
Which show in detail the paths o f electrical current. This method of design is descriptive and easy to read.
Lighting Circuits Connections
Single line diagrams, Analytical and Operating diagrams
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
Analytical diagram
Operating diagram
Important Note:
In all lighting circuits a ground
cable must be installed. Usually
the luminaires f or residential
use belong in the next two
categories:
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Simply lig ht circuit - Analytical di agram
Simply light circuit - Ope rating d iagram
Selec tor switch lighting circuit - Single line diagram
device is grounded.
The ground wire
(yellow / green) must
be connected to the
clip marked with
ground symbol.
Protection class II:
The device is doubleinsulated and cannot
be connected to the
ground.
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2. Selector switch
lighting circuit
(Comitater)
Description:
A connect ion of two
groups of lamps
controlled by a single
point. The connection is usually used in chandeliers.
General diagrams
Single line diagram
Analytical diagram
Important Note:
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Selector switch lighting circuit - Analytical diagram
Selec tor switch lighting circuit - Op erating diagram
Two-way switching lig hting circ uit - Single line d iagram
a e g s.
Operating diagram
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3. Two-way switching
lighting circuit (Two
extreme switches
AllerRetour)
Description:
Control of a lighting
circuit f rom two
points (A and B). Thistype of circuit is used
in hallways, rooms
with two entrances,
stairs, bedrooms,
e.t.c.
General diagrams
Single line diagram
Analytical diagram
With rotary switches
With pushbutton switches
Operating diagram
With rotary switches
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Fluore scent tubes - Single line diagram
Fluore sce nt tubes - Analytical d iagram
Important Note:
In figure b)we can
add more
f luorescent tubes if
we want in series but
we should also add
more s tarters and a
more powerful
ballast.
Analitycal
diagrams
Operating diagrams
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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Fluore scent tube s - Op erating diagram