Mike Holt 250 Complete Questions And Answers With Verified Solutions
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Mike Holt 250
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Mike Holt 250
Mike Holt 250 Complete Questions And Answers With Verified Solutions
A grounding electrode shall be required if a building or structure is supplied by a feeder. Correct Answer: True
Metal enclosures shall be permitted to be used to connect bonding jumpers and _____, or both, together to become ...
Mike Holt 250 Complete Questions And Answers With Verified Solutions A grounding electrode shall be required if a building or structure is supplied by a feeder. Correct Answer: True Metal enclosures shall be permitted to be used to connect bonding jumpers and _____, or both, together to become a part of an effective ground -fault current path. Correct Answer: equipment grounding conductors. The grounding electrode conductor shall be permitted to be run to any _____ available in the grounding electrode system. Correct Answer: convenient grounding electrode The armor of Type AC cable is recognized by the NEC as an equipment grounding conductor. Correct Answer: True A(An) _____ AWG or larger copper or aluminum grounding electrode conductor exposed to physical damage shall be protected in rigid metal conduit, IMC, Schedule 80 PVC conduit, reinforced thermosetting resin conduit Type XW (RTRC -XW), EMT, or cable armor. Correct Answer: 6 An equipment bonding jumper can be installed on the outside of a raceway, providing the length of the equipment bonding jumper i s not more than _____ in. and the equipment bonding jumper is routed with the raceway. Correct Answer: 72 Short sections of metal enclosures or raceways used to provide support or protection of _____ from physical damage shall not be required to be connec ted to the equipment grounding conductor. Correct Answer: cable assemblies The intersystem bonding termination shall _____. Correct Answer: all of these Electrically conductive materials that are likely to _____ in ungrounded systems shall be connected t ogether and to the supply system grounded equipment in a manner that creates a low -impedance path for ground -fault current that is capable of carrying the maximum fault current likely to be imposed on it. Correct Answer: become energized A service consist ing of 12 AWG service -entrance conductors requires a grounding electrode conductor sized no less than _____ AWG. Correct Answer: 8 Where a building or structure contains more than one service disconnect in separate enclosures, grounding electrode conducto r connections shall be permitted to be _____. Correct Answer: any of these In grounded systems, normally noncurrent -carrying electrically conductive materials that are likely to become energized shall be connected _____ in a manner that establishes an eff ective ground -fault current path. Correct Answer: together and to the electrical supply source Local metal underground systems or structures such as underground tanks are permitted to serve as grounding electrodes. Correct Answer: True A buried iron or s teel plate used as a grounding electrode shall expose not less than _____ sq ft of surface area to exterior soil. Correct Answer: 2 Listed FMC can be used as the equipment grounding conductor if the conduit does not exceed trade size _____. Correct Answer : 1 1/4 Listed FMC can be used as the equipment grounding conductor if the length in any ground return path does not exceed 6 ft and the circuit conductors contained in the conduit are protected by overcurrent devices rated at _____ or less. Correct Answe r: 20A What is the minimum size copper supply -side bonding jumper for a service raceway containing 4/0 THHN aluminum conductors? Correct Answer: 4 AWG copper _____ on equipment to be grounded shall be removed from contact surfaces to ensure good electrical continuity. Correct Answer: any of these A separate water piping bonding jumper shall be required if the metal frame of a building or structure is used as t he grounding electrode for a separately derived system and is bonded to the metal water piping in the area served by the separately derived system. Correct Answer: False The grounding conductor connection to the grounding electrode shall be made by _____. Correct Answer: any of these The connection of the system bonding jumper for a separately derived system shall be made _____ on the separately derived system from the source to the first system disconnecting means or overcurrent device. Correct Answer: a t any single point Where the resistance -to-ground of 25 ohms or less is not achieved for a single rod electrode, _____. Correct Answer: the single rod electrode shall be supplemented by one additional electrode An important consideration for limiting imp osed voltage on electrical systems is to remember that bonding and grounding electrode conductors should not be any longer than necessary and unnecessary bends and loops should be avoided. Correct Answer: True Listed liquidtight flexible metal conduit (LF MC) is acceptable as an equipment grounding conductor when it terminates in listed fittings and is protected by an overcurrent device rated 60A or less for trade sizes 3/8 through 1/2. Correct Answer: False The common grounding electrode conductor install ed for multiple separately derived systems shall be permitted to be a _____ pipe that complies with 250.68(C)(1). Correct Answer: metal water A grounded conductor shall not be connected to normally noncurrent -carrying metal parts of equipment on the _____ side of the system bonding jumper of a separately derived system except as otherwise permitted in Article 250. Correct Answer: load Service raceways threaded into metal service equipment such as bosses (hubs) are considered to be effectively _____ to the service metal enclosure. Correct Answer: bonded Ungrounded alternating -current systems from 50V to less than 1,000V shall be legibly marked "Caution: Ungrounded System - Operating _____ Volts Between Conductors" at _____ of the system, with sufficient du rability to withstand the environment involved. Correct Answer: the source or the first disconnecting means Exposed structural metal interconnected to form a metal building frame that is not intentionally grounded or bonded and is likely to become energiz ed, shall be bonded to the _____. Correct Answer: any of these Reinforcing bars for use as a concrete -encased electrode can be bonded together by the usual steel tie wires or other effective means. Correct Answer: True The frame of a portable generator s hall not be required to be connected to a(an) _____ if the generator only supplies equipment mounted on the generator, cord -and-plug-
connected equipment using receptacles mounted on the generator, or both. Correct Answer: grounding electrode Metal enclosu res and raceways containing service conductors shall be connected to the grounded system conductor if the electrical system is grounded. Correct Answer: True Exothermic or irreversible compression connections, together with the mechanical means used to attach to fireproofed structural metal, shall not be required to be accessible. Correct Answer: True A(An) _____ shall be used to connect the grounding terminal of a grounding -type receptacle to a metal box that is connected to an equipment grounding conductor. Correct Answer: equipment bonding jumper If a building or structure is supplied by a feeder from an outdoor separately derived system, a system bonding j umper at both the source and the first disconnecting means
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