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Saturday, October 30, 2010

STAIRCASE WIRING


1. STAIRCASE WIRING
AIM: To setup a staircase wiring using the given lamps,
controlled by switches.
MATERIALS REQUIRED:
S.NO COMPONENTS QUANTITY
1 PVC pipes
2 Junction boxes 1
3 bulb holder 1
4 PVC plates 1
5 Drilling machine 1
6 Wires
7 Two-way switch 2
TOOLS REQUIRED:
S.NO COMPONENTS QUANTITY
1 Neon tester 1
2 cutting pliers 1
3 Screwdriver 1
THEORY: In this wiring a single lamp is controlled from two places.
For this purpose two numbers of two-way switches are
used.
PROCEDURE:
1) Collect the materials required for this experiment.
2) Draw the layout of the given circuit diagram in the circuit
board.
3) Fix the necessary materials, by using drilling machine in
the layout board.
4) One end of the lamp holder is connected to neutral point
and another point is connected at the center of the two-way
switch B.
5) The center of the switch A is connected to the phase line.
6) The connection of the other two ends of two-way switch is
connected as follows. The point 1 of switch A is connected
DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
GE1X03 ENGINEERING PRACTICES LABORATORY MANUAL 10
to point 1 of switch B and point 2 of A is connected to 2 of
B.
7) The given lamp is fixed on the lamp holders.
8) Controlling the switches, the circuit is checked and results
are tabulated.
RESULT: Thus the staircase wiring has been constructed, tested and the
results are tabulated.
VIVA QUESTIONS:
1. Prepare the cost estimate for above wiring execution.
2. Prepare the wiring diagram for controlling a traffic signal the road
crossing at the entrance of the college.
STAIRCASE WIRING
Circuit Diagram:

Fuse rating calculations:
Power drawn by the circuit =40 watts Voltage of circuit =230volts P=VI cos Ø
Assuming cos Ø = 1 Current in the circuit = power/ voltage = 40W/ 230V = 0.174A
Fuse rating of the circuit = rounding off the current to the nearest 5 =5A
( Normally fuses are available in the ratings of 5A, 10A and etc.)
DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
Layout Diagram:

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