Page 41 - CITS - Electrician - Trade Practical

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ELECTRICIAN - CITS

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6 Remove the solenoid coil winded from wooden board and connect the end terminals by Soldering.
7 Insert and fix the steel bolt in the solenoid coil.
8 Test the solenoid coil with low voltage supply and observe the magnetic effect.
Data for preparation of heating element.
Rated voltage: 230 V

Power rating of heating coil: 1000 W
Working temperature = 500⁰ C 1000

W
I =
=
Current taken by heating coil I = = W 230 1000 Amp4.3= = 4.3 Amp
V
V 230 W 1000

V 230 I = V = 230 = 4.3 Amp
=
Resistance of heating coil R = R = = V 4.3 230 Ω 53 = 53 Ω
=
I
4.3
I

V
230
Refer the nichrome wire table for selecting the size & length of nichrome wire.
53
Ω
=
=
R =

53required size of nichrome wire is 24 SWG and resistance is 4.65 Ω per meter.
From the table, for 4.3 Amp the I 4.3
=
= 53 11.40 meter.
meter.

11.40
=
=
4.65
But total resistance of heating coil is 53 Ω. 53
4.65

So the length of nichrome wire required = = 11.40 meter.
4.65

Safety precautions
• Wound the nichrome wire uniformly without overlapping.

• Don not touch the hot heating element.
• Do not apply higher voltage to solenoid coil.

24

CITS : Power - Electrician & Wireman - Exercise 13