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ELECTRICITY DISTRIBUTION SYSTEM
ARK504
small building
AP213 - BSc (Architecture)
Mohd Nasurudin HasbullahDepartment of Architecture
UiTM [email protected]
DISTRIBUTION SYSTEMS for
SMALL BUILDING One-way switch control
Two-way switch control
Intermediate switch control
Earthing system
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One-way switch control
a single-pole switch is connected with wiring to control a
lamp.
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Two-way switch controlin principle, a single-pole changeover
switch
when connected in pairs, the switches provide control of alamp
from two positions
, ,
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Intermediate switch controlused in conjunction with two, two-way
switches, providecontrol of a lamp from three or more position
long corridor, halls
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Earthing
basic principle limiting the difference inpotential between live
conductor and earth
earth leakage
circuit-breaker
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Electrical intake
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Supply control
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SINGLE/THREE PHASE POWER CIRCUITlive
neutral
ground
ng e p asePertaining to a circuit energized by an alternating
current with one phase
Three phasePertaining to a combination of three circuit
energized by alternating current or voltages
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RING CIRCUIT
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RING CIRCUIT
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FUSERATE13A 3A
Washingmachine Readinglamp
Kettle Smallmixer
Iron Television
Toaster Dvd player
Vacuumcleaner
FreezerSpindryer
Waterheater
Aircond
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LIGHTING & SOCKET OUTLET
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ELECTRICAL FITTING LAYOUT
electrical_fitting_layout.dwg
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ELECTRICITY DISTRIBUTION SYSTEMJSB304/ARK504
large building
AP213 - BSc (Architecture)
Mohd Nasurudin HasbullahDepartment of Architecture
UiTM [email protected]
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PRINCIPAL
The higher electrical load large building such ashospitals,
factories and office block
Three phase supply
The loading in some large building too high for the locallow or
medium voltage systems to provide
And a private sub station must therefore be installed
Electrical installation similar to a small building but
isdivided into section
DISTRIBUTION SYSTEMS for
LARGE BUILDING Rising Main Distribution
Radial Distribution
Ring Main Distribution
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RISING DISTRIBUTION For building above 5 storey's
in height
Normally preferable to passconductors vertically
Bus-bar
a heavy conductor,
through the building
The supply to each floor isconnected to the rising main tap off
subsidiary unit
usua y n t e orm o asolid copper/aluminium
used for collecting,carrying anddistributing largeelectric
currents
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Prevention of spread of fire
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To subsidiary distribution panelsradiate from main
intakepanel.
RADIAL MAIN DISTRIBUTION
of a main switch connected tofused switch through abusbar
chamber
Several separate feeder cablesare run from the main intakepanel
to the subsidiary
distribution panel, which maybe situated in se arate buildin
Or at strategic points inside onebuilding
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radial installation for factory
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RING MAIN DISTRIBUTION
In the case of a large development schemehaving several building
around the perimeter ofthe site
A ring main circuitwould be taken around the
site with supplies taken into each building
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Advantages
Each building and individual section of the ring
installation
The current may flow in either direction whichreduces the
voltage drop
The sized to take account of the diversity factorfor all the
buildin since a heav load ma berequired
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RING MAIN DISTRIBUTION
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Principal of ring maindistribution
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Ring main distribution fora large site
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FLOOR DUCT
To enable desks to be moved to any position inthe office
Used to carry both low-voltage electricalsupplies for machines
and lighting and extralow-voltage supplies for private and
publictelephone
Types of floor duct Grid
Branching
perimeter
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GRID This method provides
adequate flexibility forelectrical supplies and isused o en lan
office.
A suitable spacing of theducts is 1.5 2.5 m
But other spacing's maybe used depending upon
the degree of flexibilityrequired
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Material for ducts Steel and pitch fibre duct
Twin compartment telephone and electric
Dimension 100mm x 25mm
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Floor outlet
Pre-fixed at suitable spacing,
or mounte at any point on t e uct
Connected with the necessary cable
By drilling holes through the floor finish and drawing
cablesthrough from the nearest junction box
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Skirting duct
To distribute and conceal the cable
Use n con unct on w t an un er oordust system
Cable can be taken from the underfloorduct,
via an outlet at the back skirting and runaround the room with
the skirting to the
required position a er a s ee s ee , re or
fabricated in timber
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