Philippine Electrical Code Exam Reviewer Part 3

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#1. Either a circuit breaker with inverse time characteristics or a dual-element (time-delay) fuse may serve as the following except for

#2. Determine the maximum voltage drop in a 240-volt, 2-wire heating circuit that supplies a load. The circuit size is 8 sq mm, Type THHN copper, and the one-way circuit length is 30 m.

#3. Communication, radio, and television coaxial cables shall be permitted at a height of not less than ______ above swimming and wading pools, diving structures, and observation stands, towers, or platforms.

#4. Where one system uses white for the grounded conductor, the second system must

#5. A _______ is a protective device for limiting surge voltages by discharging or bypassing surge current, and it also prevents continued flow of follow current while remaining capable of repeating these functions.

#6. Optical fiber cables and conductors for operating devices, operation and motion control, power, signaling, fire alarm, lighting, heating, and air-conditioning circuits of 600 volts or less shall be permitted to be run in the same traveling cable or raceway system if all conductors are insulated for the maximum voltage applied to any conductor within the cables or raceway system and if all live parts of the equipment are insulated from ground for this maximum voltage. Such a traveling cable or raceway shall also be permitted to include shielded conductors and/or one or more coaxial cables, if such conductors are insulated for the maximum voltage applied to any conductor within the cable or raceway system. Conductors shall be permitted to be covered with suitable shielding for the following except.

#7. Determine the maximum rating of the service overcurrent protective device that will supply a 100 A lighting and appliance load plus three squirrel-cage induction motors rated 460 volts, 3 phase, 40°C, full-voltage starting one 100-hp rated at 124 A at full load and two 25-hp motors rated at 34 A at full load on a 480-volt, 3-phase system.

#8. If the utility specifies that the service point is at the point of attachment of the service drop to the house, then the service-drop conductors are not considered service conductors because

#9. Fixed wiring methods shall be as provided for the following except for

#10. In a Three phase four wire system, compose of lighting and motor load, demand factor of 70 percent is permitted for that portion of the neutral load in excess of _____ amperes.

#11. The following are the standard ampere ratings for fuses and inverse time circuit breakers except for.

#12. Actual voltage is likely to be many times the 10,000 volts calculated, because extremely low (below normal) values were assumed for both resistance to ground and current. Most insulation systems, however, are not designed to withstand even 10,000 volts. Even if the insulation system does withstand a 10,000-volt surge, it is likely to be damaged and breakdown of the insulation system will result in sparking. The same situation would exist if the current surge were on the CATV cable or on a telephone line. The only difference would be the voltage involved, which would depend on the individual resistance to ground of the grounding electrodes. What will be the solution for this problem?

#13. Which of the following load that can be connected to 20 A Branch Circuit.

#14. Lampholders installed over highly combustible material shall be of the ______ type.

#15. According to the code, which of the following is incorrect?

#16. Hoistway is a ________ in which an elevator or dumbwaiter is designed to operate.

#17. Surge arresters installed on circuits of less than 1000 volts shall be _____ for the purpose

#18. According to the table of operating voltage in the code. The minimum conductor size for copper conductor for 8000 v is

#19. The maximum number of quarter bends in one run of EMT is ________.

#20. Any wiring on the supply side (serving utility side) of the service point is known as.

#21. Determine the minimum-size service conductors to supply a 100 A lighting and appliance load plus three squirrel-cage induction motors rated 460 volts, 3 phase, 40°C, full-voltage starting one 100-hp rated at 124 A at full load and two 25-hp motors rated at 34 A at full load on a 480-volt, 3-phase system.

#22. Conductors on poles shall have a separation of not less than ________ where not placed on racks or brackets.

#23. Determine the minimum standard size of overcurrent protective device and the minimum standard conductor size for the following circuit: 25 amperes of continuous load 60°C overcurrent device terminal rating Type THWN conductors Four current-carrying copper conductors in a raceway

#24. In practice, to compensate for voltage drops in a long circuit.

#25. An assembly of a fuse support with either a fuseholder, fuse carrier, or disconnecting blade. The fuseholder or fuse carrier may include a conducting element (fuse link) or may act as the disconnecting blade by the inclusion of a nonfusible member.

#26. Three 3-phase circuits in the same raceway, protected by overcurrent devices rated 30, 60, and 100 amperes, what shall be the size of equipment grounding conductor.

#27. Alternating-current circuits of less than 50 volts shall be grounded under any of the following conditions except for.

#28. For service entrance conductors, the minimum size of copper wires the code allows is_______.

#29. Additional services shall be permitted for different

#30. Which of the following statement is incorrect?

#31. A 3-phase, 4-wire (208Y/120-volt, 480Y/277-volt) system is often used to supply both lighting and motor loads, if the maximum possible unbalanced load is 500 amperes, the neutral would have to be large enough to carry

#32. Where the service drop is secured to the mast, a guy wire may be installed to support the mast and provide adequate mechanical strength to support the service drop_________ are not permitted to be attached to the service mast.

#33. An applied voltage of 10 percent below rating can result in a decrease of fluorescent light output by.

#34. According to the table of operating voltage in the code. The minimum conductor size for copper conductor for 15,000 v using AWG system is

#35. The inverse time factor of a DC motor is

#36. Which of the following is the maximum allowable rating of a permanently connected appliance where the branch overcurrent device is used as the appliance disconnecting means?

#37. In an insulation resistance test, an applied voltage ranging from _____ for systems of 600 volts or less supplied from a source of constant potential, is applied across the insulation.

#38. For a 3-phase, 4-wire delta system with the center of one leg grounded, there are two voltages to ground. For example, on a 240-volt system, two legs would each have 120 volts to ground and the third, or “high” leg, would have ______ volts to ground.

#39. Conductors supported on poles shall provide a horizontal climbing space not less than the following: I. Power conductors below communications conductors — 750 mm II. Power conductors alone or above communications conductors: 300 volts or less — 600 mm III. Power conductors alone or above communications conductors: Over 300 volts — 750 mm

#40. Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called.

#41. What is the total loading of a double duplex receptacle?

#42. As used in the Code, the heat transfers capability through a substance by conduction. It is the reciprocal of thermal conductivity and is designated Rho and expressed in the units °C- cm/watt.

#43. The principal determinants of operating temperature are as follows except for

#44. If the service point is specified as “at the pole” by the utility, then the service-drop conductors are considered

#45. The rating of an inverse time circuit breaker shall be permitted to be increased but shall in no case exceed _____percent for full-load currents of 100 amperes or less or ____ percent for full-load currents greater than 100 amperes.

#46. Circuits used only for the operation of fire alarm, other protective signaling systems, or the supply to fire pump equipment _________to be connected on the supply side of the service overcurrent device where separately provided with overcurrent protection

#47. A switch or circuit breaker in a wet location or outside of a building shall be enclosed in a ________enclosure or cabinet. Switches shall not be installed within wet locations in tub or shower spaces unless installed as part of a listed tub or shower assembly.

#48. A Cable containing 45 conductors has a correction factor of

#49. Where the number of current-carrying conductors in a raceway or cable exceeds three, or where single conductors or multiconductor cables are stacked or bundled longer than ________ without maintaining spacing and are not installed in raceways, the allowable ampacity of each conductor shall be reduced

#50. According to the table of operating voltage in the code. The minimum conductor size for copper conductor for 2000 v is

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