Page 937 - Basic Electrical Engineering
P. 937
As per Indian Electricity Rules, the number of light and fan points that can
be put in one circuit is restricted to eight. This includes the 5 A plug points
which are provided to plug-in some small electrical loads like a battery
charger, a mosquito repeller, a tape recorder, a TV, etc. For comparatively
heavy loads, 15 A plug points are to be provided through separate power
circuits. The wires used are thicker so that they are able to carry heavy
currents. Some typical house wiring circuits are shown through a few
examples.
Example 13.1 Draw the wiring diagram for a single tube light circuit.
Solution:
For a tube light circuit, in addition to an On/Off switch we will require a
choke and a starter. The choke and the starter help in developing a high
voltage across the tube during starting so that the flourescent tube gets
illuminated.
Figure 13.15 A tube light circuit
Example 13.2 Draw the circuit for a staircase lamp controlled from two
positions. It should be possible to switch-on or switch-off the lamp by any of
the two switches, one located upstairs and the other located downstairs.
Solution:
