QUIZ 4 ELT 152 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024/25

Briefly discuss panelboard installations that do not require a main protective device and then outline situations in which individual protection is required. - ANSWER Individual protection is required when the panelboards are connected to a secondary of a transformer that only has primary protection. What requirements should be followed for lighting and appliance panelboards? - ANSWER The panel board shall have a rating of not less than the minimum feeder capacity. The panelboard must be protected using an overcurrent protective device with a trip setting not exceeding the rating of the panel board. The 3 hour load shall not exceed 80% of the panelboard rating except when specifically rated for 100% continuous duty. What rules should be followed to set the magnetic trip? - ANSWER The lower setting provides greater protection The setting should be lower than the value of the short-circuit current available at that point. What should the selection of a circuit breaker be based on? - ANSWER Provide the proper overload protection ensure a suitable voltage rating interrupt sufficiently provide