EGC vs GEC: what it means for the Texas exam

Bonding Jumper editorial teamSources checked 26 Oct 20263 min read

The equipment grounding conductor, or EGC, runs with a circuit and connects the metal parts of equipment back to the source so a fault trips the breaker. The grounding electrode conductor, or GEC, runs from the service or a separately derived system to a grounding electrode such as a rod or a concrete-encased electrode, tying the system to earth.

A service panel with two highlighted conductors: one running out with a branch circuit to a metal box and a motor, labeled EGC, sized from the breaker; one running down from the neutral bar to a ground rod, labeled GEC, sized from the service conductors — EGC goes out with the circuit. GEC goes down to the electrode.

Side by side

	Equipment grounding conductor	Grounding electrode conductor
Job	Fault path back to the source	Connection to earth
Route	With the circuit conductors, to every load	From the service or derived system to the electrode
Carries current	Only during a fault	Surges, lightning and small currents
Sized from	The overcurrent device protecting the circuit	The size of the service or derived system conductors
Table	250.122	250.66

The two tables are the reason this pair matters.

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What counts as an EGC

An EGC does not have to be a wire. The NEC accepts several metal raceways and cable armors as equipment grounding conductors when the conditions in Article 250 are met. A green or bare wire is the familiar form, but rigid metal conduit or EMT can do the job too. A raceway that serves as the EGC must stay continuous, which is why fittings and bonding jumpers matter.

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Why the routes differ

The EGC has to reach every piece of equipment, because any of them could have a fault, and it must be able to carry the fault current long enough for the breaker to open. So it follows the circuit conductors through the same raceway, cable or trench. The GEC has one destination, the electrode, and its job does not depend on where the loads are. It runs from one point in the service equipment to the electrode by the most practical route, protected where it could be damaged.

What the GEC connects

The GEC lands at the service, where the neutral and the equipment grounding system are joined by the main bonding jumper, and runs to the grounding electrode system. A separately derived system, such as a transformer feeding a panel, gets its own GEC. The EGC is sized under 250.122(B) when a feeder is upsized.

Common mix-ups

Entering Table 250.122 with the conductor size. It is entered with the overcurrent device rating.
Entering Table 250.66 with the breaker. It is entered with the service conductor size.
Calling the GEC the fault path. Fault current returns on the EGC and bonding path. See bonding vs grounding.
Assuming a rod-only GEC must be large. Article 250 limits what a rod connection needs.

On the Texas journeyman exam

Both conductors sit in the services and separately derived systems area, 10 scored items across both portions, and the EGC also appears with branch circuits and feeders. Practise sizing them from the tables with your 2026 NEC open.

Practice it

The grounding electrode conductor sizing guide works both tables step by step. Every term in this set is in the electrical terms glossary.

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Not affiliated with or endorsed by TDLR, PSI or NFPA. NEC and National Electrical Code are registered trademarks of NFPA.

Sources

Show the list

Candidate Information Bulletin, Texas electricians (updated 9/15/2026), PSI for the Texas Department of Licensing and Regulation.
NFPA 70, National Electrical Code (2026 edition), NFPA. Free read-only access with an account.

Facts checked 26 October 2026 against the sources listed above. If something has changed, tell us and we will correct it within 2 business days.

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