In
this article, we explained about Civil Engineers Guide of Electrical House
Wiring with some articles inclusion. Try to read the full article to gain more
knowledge on House Wiring
Let’s start
What is Electricity?
Electricity
is a form of energy that results from the presence of charged particles (such
as electrons or protons).
Current
is the flow rate of an electric charge passing through a point or area. In
electrical circuits, the current is often transmitted by electrons through wires.
Voltage,
also called electromotive force, is the potential difference of voltage between
two points in an electric field.
It
results in Current
There
are two types of current used
widely:
Alternating
current, (AC) |
Direct
current (DC), |
Alternating current in which the
electric charge changes direction periodically |
Direct current (DC), in which
electrons flow in one direction |
Applications:
Household outlets are Alternating Current - household appliances, especially,
such as lamps, washing machines, and refrigerators |
Applications:
automotive applications, Batteries, aircraft applications and low current
applications. DC power is widely used in low voltage. Solar panels produce DC
power |
IMPORTANCE OF
ELECTRICITY
a)
Electricity has many
uses in our daily lives. It is used for home appliances such as lighting rooms,
working fans and electric stoves, AC and more.
b)
Large machines In
factories work on electricity.
c)
The facility cannot
be imagined without electricity. All hospitals, railways, agriculture, cinema
houses, entertainment, educational institutions, business and many more depend
on electricity.
Therefore, electricity plays a vital role in the
progress of any nation.
COMMON TERMS USED IN
ELECTRICITY
Volts: Electromotive force or
potential difference, expressed in volts (V)
Voltage: it is the difference in electric potential between two
points. Current is just the rate of flow of electric charge
W: Watt is the unit of power.
It is named after James Watt, the
inventor of the steam engine.
One
watt is specified as the energy consumption rate of one joule per second. 1 Watt
= 1 Joule per second
1W = 1J/1s
A watt is also defined as
the current flow of an ampere with a voltage of one volt.
kW: 1000 Watt which means that 1 kW = 1000 J/s
kWh: A kilowatt-hour is a unit
of energy equal to 3600 kilojoules (3.6 megajoules).
1 kWh equals one hour of
electricity usage at a rate of 1 kW, and thus the 2 kW appliance would consume
2 kWh in one hour or 1 kWh in half an hour.
The equation is simply kW x time = kWh
The kilowatt-hour is generally used as the billing unit for the energy
supplied to consumers by electrical applications.
MCB: Miniature circuit
breaker: It automatically switches
off the electrical circuit if it detects abnormal conditions or overload of the
network.
MCB
also used in low voltage electrical networks instead of a fuse.
SP-MCB: Single Pole Breaker: it is used with a typical 120v circuit, with one hot
wire and one neutral wire.
DP-MCB: Double Pole Breaker: it is used with a typical 220v circuit (like for a
dryer or heater) with two hot wires that are connected by a single neutral wire.
Based on the number of poles, the breakers are
classified as:
SP |
Single Pole |
SPN |
Single Pole and
Neutral |
DP |
Double pole |
TP |
Triple Pole |
TPN |
Triple Pole and
Neutral |
4P |
Four Pole. |
ELCB: Earth-Leakage Circuit Breaker (ELCB): It
is a safety device used in electrical installations with high earth resistance
to prevent shock. It detects small fault voltages in the metal casing of
electrical equipment and can interfere with the circuit if a dangerous voltage
is detected.
MUST-READ: Single
Phase Line Wiring Installation In House
CIRCUIT
The following load points
are usually given to each room:
Tube lights, fan, light
points, sockets, TV, AC etc.
Each load/point (on |
off) is controlled by its switch connected to the wire, MCB, fuse etc.
Types of Circuit
Open circuit: When the switch is not closed the circuit will be open
and the light in this circuit will be turned OFF.
Closed-circuit: The circuit is closed when the switch is closed, now the lamp is ON
Short circuit: When
any (+) wire or (-) wire breaks and
it is connected to the opposite pole, that circuit is called a short circuit.
This is an unusual condition and does not want to happen in any electrical
circuit. Without the right choice of protection, lights, wires, switches, sockets
etc. can be damaged.
GENERAL ITEMS WITH
THEIR LOAD/SIZE/CAPACITY
Also read: List
Of Electrical Materials Used For Residential Building
PVC
wires |
1mm2, 1.5mm2, 2.5mm2,
4.00mm2, 6.00mm2, 10.00mm2 |
MCB
distribution Board: |
4-way, 8-way, 10-way, 12-way 16-way configurations |
MCB’s: |
6 A, 16 A, 20 A, 25 A, 32 A, 40 A, 45 A, 50 A, 63 A, 80
A, 100 A, 125 A, 225 A, 600 A, 800 A, 1600 A, 2000 A, 3000 A, 3200 A, 4000 A,
5000 A, 6000 A (SP/SPN) |
Types of MCB
based on Number of Poles •Single Pole (SP) MCB •Double Pole (DP) MCB •Triple Pole (TP) MCB •Three Pole with Neutral [TPN (3P+N) MCB] •Four Pole (4P) MCB |
|
RCCB
or ELCB |
16A, 25A, 32A |
Switches |
1-way, 2-Way Switch |
5 Amp, 10 Amp, 15 Amp, 20 Amp |
|
Sockets |
2 pin, 5 Pin, 6 Pin |
5 Amp, 16 Amp, 20A, 25A, 32A |
|
Isolator |
Single Phase Isolator |
Double Phase Isolator |
|
Energy
meter |
Single phase energy meter |
Three-phase energy meter |
Items: Neutral
link, Earth rod, Lugs
FUNCTIONS OF DIFFERENT ITEMS USED IN HOUSE WIRING
Residual Current Circuit Breaker (RCCB)/ Earth Leakage Circuit
Breaker (ELCB)
Read: WHAT
IS RCCB AND WHY WE SHOULD WANT TO USE IT IN DB?
SPD - Surge Protection Devices
Read: WHAT
IS SPD AND WHY WE SHOULD WANT TO USE IT IN DB?
Energy Meter
What
are Watt, Kilowatt? kVAh and a unit of electricity?
How
To Calculate Electricity Bill?
How
to Calculate Electricity Bill from Meter Reading?
The
Energy meter is fitted by the state government to charge the electricity used
by the consumer. The unit rate is set by the government.
The
units are consumed by the consumer according to their requirement load needed
and has pay to the government.
1 Unit = 1000 Watt
1000 Watt x 1 hr or 1 kwh
Consider we have,
Ceiling fans - (6Nos. x
100W each) x 10 hrs = 6000 Wh
Tube Lights - (8 Nos. x 40
W each) x 10 hrs = 3200 Wh
Geyser - (1 No. x 1500 W) x
1 hr = 1500 Wh
A/c - (1 No. x 750 W) x 1
hr = 750 Wh
Total watts =
11450 Wh | 11.45 kwh | 11.45 units
Take Unit Rate is 8₹ - Note
rate changes based on sector (residential and industry sector)
Per day Expense: (11.45
units x 8₹) = 91.6₹
Monthly Expense:
(91.6₹ x 31 days) = 2839.6 ₹
Single Pole and Neutral Miniature Circuit
Board (SPN MCB) or Double Pole (DP)
Single-pole breakers:
its provides 15-20 amps - 120 volts and have one phase wire and one neutral
wire.
Double-pole breakers:
its provides 20-60 amps - 240 volts and have two-phase wires that share one
neutral wire.
READ: HOW
TO CHOOSE RIGHT MCB BREAKER CURRENT RATING
Isolator
The circuit breaker always
trips the circuit but when the breaker is in open contact it cannot be seen
from the outside of the breaker, which is why it is considered the "don’t touch"
part of the circuit. Therefore, isolators are made for protection so that one
can see the condition of the circuit before touching it. The isolator is a
switch that isolates part of the circuit system when needed. Electrical
isolators are a separate part of the system designed for safe maintenance. Isolators
are commonly used to repair or replace the end of a breaker.
There
is no tripping arrangement in this device, so no protection can be achieved
from the isolator. As its name is an isolator, it can switch ON & OFF load just
like ordinary switches do
Electrical Wires - Poly Vinyl Chloride
(PVC)
Sizes 1mm2,
1.5mm2, 2.5mm2, 4.00mm2, 6.00mm2,
10.00mm2 .It is suggested to use always branded, ISI marked wires
only and cheap wires should not be used.
Electrical Conduit Pipes
Electrical conduit pipe used
to pull wire without getting damaged, to various parts of the house through the
ceiling, walls, floor etc.
Generally, 25 mm heavy duty
(ISI marked) pipe should be installed in the slab construction. If neglected,
cracks can occur in the pipe
For walls, medium weight
pipe can be used to reduce the expense.
Must read: Cutting
Electrical Chases in Brick Wall/blockwork
Must read: How
Do You Install Electrical Conduit In Bricks / Block Masonry?
Must read: Method
Statement for Installation of PVC Conduits in Concrete Slabs
Must read: PVC
conduit installation Standards
USES OF ELECTRICAL
ACCESSORIES
6amp switch -
Light Points, Fan Points, Etc.
6amp 5-pin socket -
LED TV, chimney, exhaust fan, refrigerator, iron, washing machine, charging
mobile, etc.
16A-20A switch |16A-20A 6-pin socket - geyser point, heavy washing machine, AC load etc.
Fan regulator -
Control the speed of the fan.
Cover plate -
Cover all the sockets, switches, etc.
Dumpy plate -
Cover the excess point in the switch box
2-way switches -
staircase light control | entry gate lights.
Things to check on Electrical Material –
Site Engineer
a)
All accessories must
be ISI coded, branded, good looking, and chosen by the owner.
b) After completing wiring connections, be sure to check
again if there are any loose connections. The function of all points, MCB
tripping and ELCB function should also be checked.
c)
Unwanted nails,
screws, and wires cut should be removed to avoid any injury.
d) Every metal & switch box should be linked with Earthing
for human safety.
e) Mark room-wise location in MCB-distribution box
SINGLE-PHASE LINE
WIRING INSTALLATION IN HOUSE
Must read: Single
Phase Electrical Wiring Installation in Home
WHAT IS EARTHING? |
USES | TYPES
Must read: What is
Earthing And Types of Earthing
LIST OF ELECTRICAL MATERIALS
Also read: List
Of Electrical Materials Used For Residential Building
WIRE SIZING AND MCB
SELECTION FOR RESIDENTIAL BUILDING
Also read: How
to Find The Suitable Size of Cable & Wire?
THANKS
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