A PROJECT REPORT ON TYTPICAL

CIRCUIT ARRANGEMENT FOR SURFACE

WIRING (CASING &CAPPING)

NAME SUBHASISH SARKAR

ROLL NO. 27
YEAR 2023

CERTIFICATE COURSE ON ELECTRICAL

COURSE NAME INSTALLATION, MAINTENANCE,
REPAIRING & SAFETY PRACTICES

NAME OF INSTITUTION JADAVPUR UNIVERSITY

 INTRODUCTION
Electricity is the vital source to energy in the 21st century. Human cannot
wait for a minute without electricity. So, for lighting, and driving different
appliances electricity connection is more important for future
perspective. Wiring is important for smooth connection of supply with
load. Wiring is done different method.
Different wiring methods are:
1) Cleat Wiring (Temporary wiring)
2) Batten Wiring
3) Casing -Capping Wiring (Wood, PVC)
4) Conduit Wiring (PVC, Rigid PVC, Metal)
5) Concealed Wiring (Metal, PVC).
6) Hybrid Wiring (Mix of above methods)

Factors affecting the choice of wiring:

1. Durability
2. Safety
3. Appearance
4. Cost
5. Accessibility
6. Maintenance.

From fire safety point of view, concealed wiring is found best with
joint-less method of connection. External fire cannot damage the
wiring, and provide light for safe escape, and in case of electrical
short-circuit, the fire arrested within wall, and cannot produce external
fire.
 Here we discuss with the Casing -Capping Wiring

Note :
1. Either 800 watt or 10 points, whichever is less, would be connected from
each single way from Distribution Box (DB).
2. For future extension of load provision should be kept for either 20%
excess of total watt or sufficient excess points.

Circuit Diagram:

Call
Bell
SPNDB
Bulb Ceiling Fan
Main Switch

Bell Push

Plug Board

Earth Bus

Switch Board
List of materials with Specification:

Sl. Name of Materials Specification with Quantity

No
1. SPNDB 2 way, MCB DB, with 2 nos.
of 20A SPMCB in 175 x 85 x
50 mm PVC box.
2. Casing & Capping 20mm - 6 mts, No corners,
bends used.
3. Main Switch 32A Double pole, Sheet
metal enclosure type.
4. MS Screw 20/3- 36 nos.
25/5- 8 nos.
35/8- 6 nos.
5. Flat Washer 48 Nos
6. PVC insulated copper Red – 10 Mts
wire Green - 10 Mts
Black - 10 Mts
7. PVC tape 20 mm 9 mts roll – 1 NO
8. Piano Switch 250 volt, 5A – 3 Nos
9. Plug Socket 250V, 5pin , 5A – 1 No
10. Bell Push Switch 250V, 5A – 1 No
11. Earth Bus 25 x 6 mm GI earth bus – 4
hole
12. Calling Bell 250 volt ding dong bell
13. Inspection Box / Join 175 x 85 x 50 mm PVC box –
Box 1 No
14. Fuse 250 Volt 20A – 1 No
15. Bulb Holder 250 Volt BC type batten
holder – 1 No
List of Tools with specification:
Sl. Name of Tools Specification with quantity
No
1. Combination Plier Drop forged insulated handle,
8”-1 No

2. Long Nose plier 6” long nose plier – 1 No

3. Screw Driver 6” 6mm slot head-1 No
8” 8mm sloted & Philips head
combo – 1 no

4. Live Line Tester 90v or above neon tester with

1MΩ resistance -1 No
5. Poker Triangle, 6” wooden handel-1
no
6. Hacksaw 6” x ½ ” – 1 No
7. Knife Stainless steel sharp 4” knife-
1 no
8. Wire Stripper Combination cutter cum
stripper- 1 No
Nipper- 1 no
9. Hammer 250 gm ball pin hammer
10. Insulation Megger 1000 v hand Driven megger, -
1 no
Make-MECO
 PROCEDURE
The whole procedure of the casing and capping wiring is stated
below: -
• At first, electrical drawing is studied and take down material
list and tools of the wiring installation, as per tables.
• The tools list was prior given, and we take all tools as per
list.
• Then the materials are bought from the JU office workshop.
• A small idea made by team members.
• Thereafter casing and capping are cut as per size.
• Then main switch is installed.
• After that SPNDB is installed as per figure.
• Switch board is also installed with proper switch connection.
• Then casing is fixed with screw on the wall as required.
• Then wires are cut by wire stripper and laying as per
diagram.
• Then power plug point is fixed as per diagram.
• Switches are also interconnected as per diagram.
• An earth bus is also installed, with a proper measurement of
the system.
• Earth wire is also connected with the system with green
wire.
• Holder is installed for bulb connection.
• Ceiling rose is installed for fan connection.
• A bell push switch is installed for a bell connection.
• At last, whole connection is completed as per circuit
diagram and gone for testing.
 TESTING
Testing is taken a vital role for s installing electrical
system. Here testing is also done after the wiring. At
first visual checking of all wires terminals for
connection is done.
• Insulation Resistance is checked by IR megger.
With load off condition.
Sl. No. Position IR Value
01 Phase-Neutral 200MΩ
02 Phase-Earth 200MΩ
03 Neutral - Earth 200 MΩ

With load ON & connected condition.

Sl. No. Position IR Value
01 Phase+Neutral - Earth 200MΩ
02 Phase – Earth 150MΩ
03 Neutral – Earth 150 MΩ
04 Phase - Neutral 0 MΩ

• Then continuity test is also done by series lamp test

method before power up. The result is ok.
• A load is connected with all respective points and
the results will be response ok.
• At last, the wiring is completed.
 Remarks: -
➢ From my side the wiring diagram is ok.
➢ Casing and capping are not straight because of lack of
measurement, and absence of level pipe (water column).
➢ I learn the overview of a casing capping wiring.
➢ I also learn about the switch connection and electric bell
connection.
➢ I learn that the estimation and costing of a electrical
installation.
➢ Precaution during IR-megger test is well informed.
➢ Reason of Series lamp testing is verified by making
deliberately shorting for fault.

Conclusion: -
In conclusion, the report on casing and capping wiring
highlights the importance of these protective measures in
electrical installations. Casing provides a secure
enclosure for wiring, safeguarding it from physical
damage and environmental factors. Meanwhile, capping
ensures a neat and organized appearance while offering
additional protection. Together, these practices contribute
to the safety, longevity, and efficiency of electrical
systems, making them essential considerations in any
wiring project.
FULL WIRING

TESTING
WIRING TIME

GROUP WORK