Ask BONBON (not Ask META) is Ask BONBON - AI-Powered NEC Code Reference, built for electricians who need fast, practical code guidance in the field.

Journeyman Exam Prep Set 2: Grounding and Bonding Scenarios

Use this set as a timed drill: answer first, then check the key and explanation.

Questions

1. What is the primary function of system grounding?
2. What is the primary function of equipment bonding?
3. Can the grounded conductor (neutral) and equipment grounding conductor be bonded downstream of service disconnect in a typical separate neutral/ground system?
4. What NEC section addresses objectionable current on grounding paths?
5. When is a grounding electrode system required?
6. Why is proper bonding of raceways and enclosures critical?
7. What is one common field mistake with separately derived systems?
8. Does an equipment grounding conductor replace the need for GFCI/AFCI devices?
9. What should be verified when adding new equipment to existing grounding systems?
10. What makes a grounding/bonding correction package inspection-ready?

Answer Key + Explanations

1) To stabilize system voltage to ground and limit voltage from surges/accidental contact.

NEC 250.4 explains performance objectives for grounded systems.

2) To provide an effective fault-current path to facilitate overcurrent device operation.

Bonding connects conductive non-current-carrying parts to reduce touch voltage during faults.

3) No.

Main bonding jumper connection is made at service equipment; downstream bonding can create objectionable current.

4) NEC 250.6.

It prohibits grounding arrangements that create objectionable current flow.

5) At each building/structure served, per NEC requirements.

Electrode system components must be bonded together to form a grounding electrode system.

6) It ensures low-impedance continuity for fault clearing.

Loose or nonbonded metal pathways can delay breaker operation and increase hazard.

7) Incorrect neutral-to-ground bonding location.

Bonding at multiple points can create parallel neutral paths and nuisance issues.

8) No.

EGC, GFCI, and AFCI serve different protective functions and are often complementary.

9) Continuity, bonding integrity, and code-compliant connection methods.

Retrofits often fail due to assumptions about existing grounding quality.

10) One-line notes, photos, torque documentation, and cited NEC sections.

Evidence-backed corrections reduce reinspection delays and disputes.

References

• NFPA 70, National Electrical Code (NEC), current adopted edition in your jurisdiction.
• NFPA 70E, Standard for Electrical Safety in the Workplace.
• OSHA 29 CFR 1910 Subpart S and 1926 Subpart K (as applicable).
• Local AHJ amendments and utility service requirements.

Ask BONBON is a free field companion for electricians with fast NEC-oriented guidance at www.askneta.com (App Store + Google Play).

Related internal guide

For a broader field reference, review the Complete NEC Code Guide for Electricians.

Download Ask BONBON

Get faster code lookups in the field: Download Ask BONBON.