No confusion costs more points on the grounding section than mixing up neutral and ground — they are different conductors, they do different jobs, and the NEC allows them to meet in only one place.
Article 100 defines the terms the exam uses, and the two terms here are easy to confuse because they sound nearly identical. The grounded conductor is a system or circuit conductor that is intentionally connected to ground. In a standard single-phase or three-phase system, this is the neutral — the conductor that completes the circuit by returning current from the load back to the source under normal operating conditions. Current flows through it every time a light switch is flipped.
The equipment grounding conductor (EGC) is a grounding conductor — note the different word order — that connects the non-current-carrying metal parts of equipment and enclosures back to the source. Under normal, fault-free conditions the EGC carries no current. It exists so that if a phase conductor contacts a metal enclosure, the fault current has a low-impedance path back to the source and the overcurrent device clears quickly. The two conductors have completely different functions, and the NEC treats them accordingly.
In a grounded system, the grounded conductor (neutral) and the equipment grounding conductors must be connected at exactly one point: the service. This connection is made by the main bonding jumper, which bonds the neutral bus to the equipment grounding bus (and the enclosure) at the main service equipment. The grounding electrode conductor then ties both to the grounding electrode in the earth. From this single point, current that returns on the neutral is referenced to earth, and the equipment grounding conductors have a return path to the source through that same bus.
The single-point bonding requirement is intentional and critical. If neutral and ground were bonded at more than one location, there would be multiple parallel paths for normal neutral current: the intended neutral conductor and also the equipment grounding conductors and metal raceways. Normal load current would flow on the EGCs and metal equipment, energizing surfaces that are meant to be at zero volts under normal conditions. That is a shock hazard, and it is exactly what a bootleg ground creates.
At a subpanel — a distribution panel fed by a feeder rather than directly from the utility — the neutral bar must be isolated from the metal enclosure. The feeder brings in four conductors: two ungrounded (hot) conductors in a typical 120/240 V single-phase system, one grounded (neutral) conductor, and one equipment grounding conductor. At the subpanel, the neutral conductor terminates on an isolated neutral bar, and the EGC terminates on a ground bar that bonds directly to the enclosure. The neutral and ground bars are kept separate.
Bonding the neutral to the enclosure at the subpanel — whether by using the wrong type of terminal bar or by running a jumper between the two bars — creates a second neutral-to-ground bond downstream of the service. The result is that normal neutral return current finds two paths back to the source: the neutral conductor and the parallel path through the EGC and metal enclosures. The EGC becomes current-carrying, which is a violation of Article 250 and creates the same hazards as a bootleg ground.
A bootleg ground is the field shortcut of jumping the ground terminal to the neutral terminal at a receptacle or device, usually to make an ungrounded outlet read "correct" on a receptacle tester. The tester sees a voltage difference between the neutral and the newly jumped ground terminal and reports "correct ground," but the connection is fraudulent. There is no low-impedance fault path back to the source through a dedicated EGC; there is only a neutral connection dressed up as a ground.
A bootleg ground is a code violation under Article 250 and a shock hazard. Because the "ground" is actually the neutral, any imbalance or break in the neutral conductor can push voltage onto the grounded metal parts of connected equipment. The exam tests this scenario because it requires understanding why the single-point bond rule exists — not just that it exists.
When an exam question uses the word "grounded," it almost always means the neutral — a conductor intentionally connected to ground that carries normal circuit current. When it says "grounding," it means the equipment grounding conductor or the act of connecting to earth — a conductor or path that normally carries no current. The grammatical distinction (adjective vs. participle) is the NEC's way of signaling two entirely different conductors.
| Term | NEC name | Normal current? | Bonded at service? |
|---|---|---|---|
| Neutral wire | Grounded conductor | Yes — return current | Yes, via main bonding jumper |
| Ground wire (green/bare) | Equipment grounding conductor | No — fault current only | Yes, via main bonding jumper |
Pair this with the grounding electrode system article to understand what the service bond connects to in the earth, and review EGC sizing under 250.122 to see how the equipment grounding conductor is sized for each circuit once it leaves the service.
Real journeyman-exam practice questions from Loomi's bank — answer first, then reveal the explanation.
According to 250.24(E), which section governs the sizing of the grounding electrode conductor?
Correct: B — 250.66
250.24(E) states the grounding electrode conductor is sized in accordance with 250.66. 310.16 is a general ampacity table, 250.122 sizes equipment grounding conductors (a different conductor with different sizing rules), and 215.2 covers feeder sizing — none apply to GEC sizing under this section.
Service-entrance conductors are run in parallel across three raceways. Which statement about the grounded conductor in each raceway is correct?
Correct: B — It must be installed in each raceway, connected in parallel, and never smaller than 1/0 AWG
250.24(D)(2) requires a grounded conductor in each parallel raceway or cable, connected in parallel, sized not smaller than 1/0 AWG and per 250.24(D)(2)(a) or (b). There's no exception that drops it below 1/0 AWG or allows omitting it from any raceway in the parallel set.
An electrician finds that a subpanel's neutral bus is bonded to the enclosure with a bonding screw, and the panel is fed from the load side of the service disconnect with no separately derived system involved. What does 250.24(B) say about this?
Correct: C — It is prohibited, because the grounded conductor cannot be reconnected to equipment or ground on the load side of the service disconnect
Per 250.24(B), the grounded (neutral) conductor cannot be bonded to the enclosure or equipment grounding conductors anywhere on the load side of the service disconnecting means, unless an exception like 250.30 (separately derived systems) or 250.32 (separate buildings) applies. A standard fed subpanel must have the neutral and ground kept separate, with the bonding screw removed.
A service equipment assembly is listed for use with more than one service disconnecting means. How must bonding be handled?
Correct: C — An unspliced main bonding jumper bonds the grounded conductor(s) to the assembly enclosure
250.24(C) states that for a listed assembly with more than one service disconnect, an unspliced main bonding jumper bonds the grounded conductor(s) to the assembly enclosure — not a separate jumper per disconnect, and not limited to the disconnect closest to the utility.
Loomi turns NEC content into 12,934 spaced-repetition exam questions built for the journeyman test. Try everything free for 3 days.
Get launch access