aleph-what number i dont know whether 4 or 5

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EARTH

in aleph circuit. 220v power socker has three pointer , two pointers attached 220v , last pointer attached a thermistor resistor to earth ground of circuit. why to do so?
my transformer also has ground electrical wire, so what pointer of circuit should this wire attach? attach case or power socket or circuit?
my english is poor ,if you dont understand it ,let me know, i will explain it.
 
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