Page 269 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

8 If found good in visual inspection, check the element with multimeter for continuity.

9 Replace the heating element if found no continuity.
10 Check the cable for continuity and insulation.
11 Check the cable near the entry points of the plugs for breakage or sign of overheating.
Too rigid of cable insulation will indicate overheating. Too much flexibility is an indication of breakage of
conductor.
12 Check for overheated terminals of socket and plugs.
13 Check the body for rust, particularly at the socket inner surface and at the fixing holes.
Rusted sockets or earth clips of plugs should be replaced. Never paint them. But the rust in the
fixing holes may be removed and repainted. If necessary, replace the screws of bigger size.
14 Replace the heavily pitted, welded terminals of socket and plug. Replaced plug should be checked for proper
tight fitting in the socket.
15 Check the hot plate for breakage. Broken plates need to be replaced.
16 Check the earth continuity of body and grill plate.
Insulation resistance between the live parts and body should not be less than one mega ohm.

TASK 2:
1 Dismantle the electric iron.
2 Identify the parts
3 Trace the internal connection of iron.
4 Draw the free hand sketch of electric iron parts.
5 Draw the circuit diagram of electric iron.
6 Conduct preliminary test for short circuit, continuity & insulation, earth fault, defective element circuit
7 Check the continuity of heating element using test lamp or multimeter Fig 2
8 Check the earth continuity of body and grill plate.

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CITS : Power - Electrician & Wireman - Exercise 101