Maryland Journeyperson Electrician Exam, Grounding and Bonding: all 59 questions

All questions from the Grounding and Bonding section for Maryland Journeyperson Electrician Exam, each with the correct answer.

• 5001At a building or structure, which of the permitted grounding electrodes must be bonded together to form the grounding electrode system?
• 5002A metal underground water pipe qualifies as a grounding electrode only if it is in direct contact with the earth for at least what length?
• 5003When a metal underground water pipe is used as a grounding electrode, what else does the Code require?
• 5004Under the general rule, interior metal water piping located more than what distance from its point of entrance may NOT be used to interconnect electrodes that are part of the grounding electrode system?
• 5005A concrete-encased electrode made of bare copper conductor must be at least 20 ft long and not smaller than what size?
• 5006A concrete-encased electrode must be covered by at least how much concrete?
• 5007A ground ring encircling a building must consist of at least 20 ft of bare copper conductor not smaller than
• 5008What is the minimum length of a rod or pipe grounding electrode?
• 5010Where rock bottom prevents driving a ground rod vertically, the rod may be driven at an angle not exceeding what from vertical?
• 5011A single rod electrode does not need a supplemental electrode only if its resistance to earth is
• 5012Where two ground rods are installed to meet the supplemental electrode requirement, they must be spaced at least how far apart?
• 5013A ground rod measured 40 ohms, so a second rod was driven 6 ft away. The pair still measures 30 ohms. What else is required?
• 5014Which of the following is NOT permitted to be used as a grounding electrode?
• 5015The portion of a grounding electrode conductor that is the sole connection to one or more ground rods is not required to be larger than
• 5016The portion of a GEC that is the sole connection to a concrete-encased electrode is not required to be larger than
• 5017The portion of a GEC that is the sole connection to a ground ring is not required to be larger than
• 5018A service has 2/0 AWG copper ungrounded conductors. What is the minimum copper GEC to a metal water pipe electrode?
• 5019A service has 4/0 AWG copper ungrounded conductors. What is the minimum copper GEC to the building steel electrode?
• 5020A service has 500 kcmil copper ungrounded conductors. What is the minimum copper GEC to a water pipe electrode?
• 5021A service has two parallel sets of 3/0 AWG copper (about 168 kcmil each). What is the minimum copper GEC to a water pipe electrode?
• 5022A service has three parallel sets of 400 kcmil copper per phase. What is the minimum copper GEC to building steel?
• 5023How must an 8 AWG copper grounding electrode conductor be installed?
• 5024When does a 4 AWG copper grounding electrode conductor require protection?
• 5025Under NEC 2020 and 2023, other than at busbars, a grounding electrode conductor may be spliced only by
• 5027A ferrous metal raceway that encloses a grounding electrode conductor must be
• 5030At the service, the main bonding jumper connects
• 5031What is the minimum size copper main bonding jumper for a service with 4/0 AWG copper ungrounded conductors?
• 5032A service has four parallel sets of 500 kcmil copper per phase (2000 kcmil total). What is the minimum copper main bonding jumper?
• 5033A subpanel in the same building is fed by a feeder from the service. How must the grounded (neutral) conductor be treated at the subpanel?
• 5034For a grounded service, the GEC connection to the grounded service conductor is permitted
• 5035What is the minimum copper equipment grounding conductor for a circuit protected by a 20 A OCPD?
• 5036What is the minimum copper equipment grounding conductor for a feeder protected by a 100 A OCPD?
• 5037What is the minimum copper equipment grounding conductor for a feeder protected by a 400 A OCPD?
• 5038A 20 A branch circuit is upsized from 12 AWG to 10 AWG copper to limit voltage drop. What is the minimum copper EGC?
• 5039A 60 A circuit is upsized from 6 AWG to 4 AWG copper for voltage drop. What is the minimum copper EGC?
• 5040A 1200 A feeder is run in four parallel raceways, each with its own copper EGC. What is the minimum EGC in each raceway?
• 5041The EGC for a motor branch circuit is sized from Table 250.122 based on
• 5042Which of the following is recognized as an equipment grounding conductor?
• 5043Listed flexible metal conduit with listed fittings may serve as the EGC only where the circuit OCPD is rated not more than
• 5045Why is the earth not permitted as the effective ground-fault current path?
• 5046A ground rod is driven at a parking lot light pole and connected to the pole. How does the Code treat this rod?
• 5047Which identification is NOT permitted for an equipment grounding conductor of 6 AWG or smaller?
• 5048An insulated conductor 4 AWG or larger may be permanently identified as an EGC at installation by
• 5049A service raceway enters an enclosure through a knockout with concentric rings left in place. Which bonding method alone is NOT acceptable?
• 5050The intersystem bonding termination must be able to connect at least how many intersystem bonding conductors?
• 5051Where is the intersystem bonding termination required?
• 5052A service has 3/0 AWG copper ungrounded conductors. What is the minimum copper bonding jumper for the interior metal water piping?
• 5053Metal gas piping that is likely to become energized may be bonded by
• 5054For a separately derived system, where is the system bonding jumper installed under the general rule?
• 5055A transformer supplies 250 kcmil copper secondary conductors. What is the minimum copper GEC for this separately derived system?
• 5056The system bonding jumper of a separately derived system is sized based on
• 5057A detached garage supplied by a feeder must have a grounding electrode system, except where it is supplied by
• 5058At a separate building supplied by a feeder that includes an EGC, the grounded conductor at the building disconnect must be
• 5059Which of these AC systems is required to be grounded?
• 5060High-impedance grounded neutral systems are permitted for 3-phase AC systems of 480 V to 1000 V where
• 5061Which of the following shall NOT be used to connect EGCs or bonding jumpers to enclosures?
• 5062An equipment bonding jumper on the load side of an OCPD is sized according to
• 5063A supply-side bonding jumper on the line side of the service disconnect is sized from
• 5064In NEC 2020 and NEC 2023, grounding requirements specific to systems over 1000 V are located in

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