Answer all questions 17.40 through 17.60

17.40 Fuses and circuit breakers are primarily for the purpose of protection from which of the two principal hazards from electricity? What is the other principal hazard? Do fuses and circuit breakers help mitigate this hazard also? If so, how? 17.41 What is the hazard of substituting a penny or other low resistance electrical connection in lieu of a fuse or circuit breaker? 17.42 What is a weatherproof outlet? Is it approved for Class I, Division 1 locations? Is it approved for Division 2 locations? Why or why not? 17.43 What happens when a continuity tester is used in place of a circuit tester? 17.44 Identify two receptacle wiring mistakes that go undetected by a receptacle wiring tester. 17.45 What simple procedure in the repair of an electric plug will prevent a commonly cited violation of electrical code? 17.46 Is it okay to use an extension cord to connect an appliance in another room through a hole in the wall? 17.47 When a wall receptacle outlet has a missing plate cover, what is the electrical code violation? 17.48 Calculate the energy released in an arc flash at 480 volts in which the fault current is 8000 amperes and the duration of the fault is 5 cycles on a 60- Hz circuit. 17.49 Which electrical tester requires a battery? 17.50A GFCl detects ground faults by comparing current flows in which two wires? 17.51 The ground wire of a circuit is inadvertently connected to a grounded object along the circuit. Will the GFCl detect it? 17.52 Which of the three wires in a conventional circuit is ignored by the GFCl? 17.53 What is the difficulty with relying upon a defibrillation device to restore natural heart rhythm? 17.54 What effect of electrical shock is treated the same as for a near-drowning victim? 17.55 Almost everyone has received a shock from a household electrical outlet and survived. Does this mean that household circuits are not powerful enough to be dangerous? 17.56 When an ordinary household circuit breaker is tripped by current overflow that happens to flow through a person's heart muscle, how much greater than a lethal dose is the person receiving? 17.57 What hazard mechanism makes ordinary 110 -volt circuits even more dangerous than 220 -volt or higher circuits? 17.58 What common error in wiring is not detected by ordinary circuit testers? 17.59 What easily corrected violation of electrical codes is the largest single item to remember? 17.60 If electrical equipment cannot be insulated and terminals covered, what should be used to protect workers