Electrical Exam Questions with Complete Solutions (Latest 2025) Basic protection is provided by - Correct Answers ✅Barriers Fault protection is provided by - Correct Answers ✅Protective earthing Max voltage drop for 230v - Correct Answers ✅11.5 An RCD Protects against - Correct Answers ✅Earth faults Max disconnection time for a TN circuit - Correct Answers ✅0.4s RCDs are not required for - Correct Answers ✅Labelled socket outlets for freezers When doing insulation resistance test on ref unit what should be disconnected - Correct Answers ✅Start capacitor Max % voltage drop allowed - Correct Answers ✅5% The maximum horizontal clip spacing for a 12mm diameter armoured cable is - Correct Answers ✅350mm 1 / 2
Electrical Exam Questions with Complete Solutions (Latest 2025) The derating factor Ci for a cable passing through insulation 100mm thick is - Correct Answers ✅0.78 The rating factor Cg for a 5 multicore cables enclosed in trunking is - Correct Answers ✅0.6 The insulation test voltage in VDC for a 230V AC circuit is - Correct Answers ✅500 The rating factor Ca for a 70oC thermoplastic cable in a 35oC ambient is - Correct Answers ✅0.94 A cable concealed in a wall must run - Correct Answers ✅Within 150mm of the top of the wall Min protection for Water Jets - Correct Answers ✅IPX5 The impedance of a circuit is defined as it's resistance to the flow of - Correct Answers ✅Alternating Current (A/C) The electrical current needed to stop a human heart is - Correct Answers ✅50 mA The value of an alternating current is given by its - Correct Answers ✅Root mean square value
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