costing of domestic and industrial wiring

1. ELECTRICAL WIRING
ESTIMATION & COSTING OF
DOMESTIC & INDUSTRIAL WIRING
PART 1
3.1

2. Types of wiring
Temporary Permanent
Over view of wiring
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3. • Convenience
• Financial capacity
• Weather
• Fashion or trends
• Technical reasons
• Social and Cultural reasons
• Look matters..?
• Yes
Selection
of wiring
types
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4. Wiring types
Domestic
•Lighting circuit
•Power circuit
Industrial
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5. Why
Lay out plan
of wiring is so
important?
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6. To work
out man
power &
material
To work
out cost
To find
faults in
future
To plan the
work
To put
proper
safety
mechanism
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7. What is SUB CIRCUITING?
• Division of wiring in small parts
• Makes wiring easier
• Is more reliable
• More safe
• Low voltage drop hence more efficient
• Separates heavy loads and Light loads
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8. Sub Circuits (Its as per the load calculation)
•Lighting sub circuit
• Lights
• Fans
• 5Amp plugs etc
•Power sub circuit
• Refrigerator
• Oven
• Heater
• Geyser etc
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9. What is
looping ?
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10. Looping is a method of wiring
Generally Neutral wire is looped for two or
more than two loads, say lamps
Means separate phase wire will run for each
load
But common neutral wire will be there as
return path
It saves wire
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11. Standard Size of wires/cables in mm2
0.5 0.75 1 1.5 2.5
4 6 10 16 25
35 50 70 95 120
150 185 240 300 400
630 800 1000
500
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12. Procedure for Domestic wiring estimation
Draw layout plan
Calculate Electrical load
Calculate no. of power & Lighting
sub circuits
Calculate wire size then consider
next higher size
Select proper switches , boards,
fuses etc
Tabulate required wire and other
accessories
Calculate cost of material, labor
and misc cost
Now calculate per point cost of
wiring
Procedure for Domestic wiring
estimation
Calculate conduit, earthing wire
etc
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13. Important points to take care of:
Always connect switch in phase and never in neutral.
Use proper rating wire and other accessories
Use ISI material to ensure safety
Use fuses of proper rating
Keep proper lighting and power sub circuits
Have proper earthing and earthing wire
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14. Ready for
calculation
now?
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15. Draw wiring layout,
calculate material & costing
for the newly constructed 3
BHK bungalow.
You are free to assume data
and appropriate price
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16. ELECTRICAL WIRING
ESTIMATION & COSTING OF
DOMESTIC & INDUSTRIAL WIRING
PART 2
3.2

17. • Insulation resistance test
• Resistance b/w conductor
& Earthing
• Resistance b/w conductors
• Polarity test
• Earth continuity test
Tests before
commissioning
of wiring
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18. Insulation Resistance Test
• Measured by Megger Insulation tester
• Megger must be tested for infinity value prior
to operate.
• It should be in M Ohm or higher
• It should be periodically measured for safety
point of view
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19. Resistance between Conductors
Resistance between Conductor & Earth
• These values should also be in M Ohms
• If its lower than Standard value, then short
circuit may occur
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20. EASY ENGINEERING

21. •Used to verify whether switches
are connected in phase and not
in neutral.
•This ensures the safety of a
person
Polarity Test
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22. Continuity Test
•This test helps to determine if wire
is continuous or broken in the way.
•Generally meter is set to Beap if
circuit is continuous or short
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23. Estimation
of
Domestic
wiring
Decide required
wiring type
Identify 5A & 15
A points
Calculate circuits
& Sub circuits
Identify locations
for Main boards,
Distribution
boards and
others Calculate
material required
Find out costing
Divide Total cost
by no. of poitns
to get per point
cost
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24. ESTIMATION
OF
INDUSTRIAL
WIRING
Calculate load
according to
ratings of
machines
Calculate main
switch ratings
Determine
Panels, starters,
switches ,
locations etc
Calculate cable
size according
to table of
standards See if lighting
circuits are
required
Refer price
catalogues
Calculate total
material and
price
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25. PRACTICE MAKES MAN PERFECT..
Try few examples by your own
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