Journeyman Wireman Electrical Test Study Guide NEC - Larry Bobo Workbook

Journeyman Wireman Electrical Test Study Guide NEC - Larry Bobo Workbook 1. What is the required input conductor ampacity for a phase converter with a nameplate rating of 56 amperes for full-load single-phase input that supplies variable loads? - Answer: 70 amperes (Reference: Phase Converters, NEC Section 455.6(A)(1)). 2. For a 277/480 volt 3-phase wye service, where should the grounded conductor be run and bonded? - Answer: To each service disconnecting means (Reference: AC systems, grounding connections, NEC Section 250.24(C)). 3. In a 480 volt 3-phase ungrounded parallel delta service, what should the equipment bonding jumpers be based on? - Answer: The size of the service entrance conductors in each raceway (Reference: NEC Section 250.102(C)(2)). 4. What safety feature must luminaires using metal halide lamps (other than PAR lamps) include? - Answer: A containment barrier that encloses the lamp (Reference: NEC Section 410.130(F)(5)). 5. What is the maximum allowable rating for an overcurrent device for three parallel runs of 75°C-rated, 350 kcmil THHW copper conductors in EMT? - Answer: 800 amperes (Reference: Ampacity tables, NEC Tables 310.15(B)(16), 240.4(C), 240.6). 6. Where is liquidtight flexible metal conduit with listed fittings permitted? - Answer: In Class I, Division 1 locations for lengths under 6 feet, provided with an equipment bonding jumper (Reference: NEC Section 501.10(B)(2)(4), 501.30(B)(2)). 7. What classification applies to the area up to 18 inches above grade and within 20 feet from the edge of an LPG dispenser at an outdoor motor fuel dispensing facility? - Answer: Class I, Division 2 (Reference: Motor fuel dispensing facilities, NEC Section 514.3(B)(2), Table 514.3(B)(1)). 8. Which wiring method is NOT permitted in spaces used for environmental air handling other than ducts or plenums, such as above a suspended ceiling? - Answer: Liquidtight flexible metal conduit (Reference: NEC Section 300.22(C)(1)). 9. For feeding a 40-hp, 460-volt, 3-phase AC wound rotor motor at an ambient temperature of 86°F, what is the maximum size for Type SO cord? - Answer: AWG 3 (Reference: Calculation, Table 430.250). 10. What is the maximum size of a solid ungrounded conductor that may be installed in a raceway? - Answer: AWG 10 (Reference: NEC Section 310.106(C)). 11. What is the time-delay setting required for legally mandated standby generator sets to prevent re transfer if normal power returns briefly? - Answer: 15 minutes (Reference: Generators, legally required standby systems, NEC Section 701.12(B)(1)). 12. What type of receptacle with a regular faceplate is required for a patient care area in a pediatric ward? - Answer: Tamper-resistant receptacle (Reference: Pediatric Locations, NEC Section 517.18(C)). In non-residential use, what is the maximum overcurrent protection ampere rating for 2 AWG RHW aluminum conductors with an ambient temperature of 88 degrees F? Ampacity Tables Table 310.15(B)(16) ️90 Panelboards shall have overcurrent protection of 200 amperes or less where equipped with snap switches rated at _ amperes or less. AC-DC general use snap switches, Panelboards, use in OR Switches, Panelboards, use in 408.36(A) ️30 If no overcurrent protection is provided on the secondary of a 480-volt, 3 phase, 5KVA transformer, what is the maximum ampere primary overcurrent protection allowed? Tables, Transformers, medium and high voltage Table 450.3(B) ️10 Sealed batteries or cells shall be equipped with a: Batteries, vents 480.11(B) ️pressure release vent The classification of an area in which Group E combustible dusts may be present in quantities to be hazardous is: Hazardous atmospheres, Class II locations, 500.5(C) 500.5(C)(1)(3) ️Class 2 Division 1 The manufactured phase conductors of a phase converter shall be: Manufactured phase, Marking 455.6(B) ️Identified in all accessible location with a distinctive marking An outdoor motor controller enclosure subject to temporary submersion shall be of a type: Enclosures, outdoor use, for Table 110.28 ️6P Where a water pipe passes over an indoor motor control center, leak protection apparatus shall have a minimum clearance of: Panelboards, installation 110.26(E)(1) ️Six feet to the protection apparatus In general, when more than one building is on the same property and under single management, each additional building served that is on the load side of the disconnect shall be supplied by a maximum of how many feeder or branch circuits? 225.30 ️1 In general, which receptacles in a commercial kitchen are required to be GFCI protected? Ground fault circuit interrupters, receptacles 210.8(B)(2) ️All 125-volt, 15 or 20 ampere receptacles In each conduit run leaving a Class 1, Division 1 location, the sealing fitting shall be permitted on either side of the boundary of such location: Hazardous (Classified) locations, Class 1, Sealing 501.15(A)(4) ️Within 10 feet of the boundary