List any four internal causes for abnormal operation of electrical equipment’s.

List any four internal causes for abnormal operation of electrical equipment’s. 
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Answer :

Internal causes:- 1. Open circuit 2. Short circuit 3. Earth fault 4. Loose connection 5. Deposit of dirt and dust near ventilation passage 6. Low insulation resistance 7. Improper maintenance 8. Poor ventilation 9. Wrong connection 10. Thermal stresses due to thermal overload 11. Magnetic stresses as result of electromagnetic forces 12. Residual stresses caused by manufacturing problems 13. Failure of cooling system 14. Excess wear and tear of internal parts 15. Ageing.
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