Feeders — Texas Journeyman Practice Questions

6 questions · 5% of the NEC Knowledge exam

Worked questions

1. A feeder overcurrent device is rated higher than the allowable ampacity of its conductors, with no applicable tap or next-size rule. What is required?

Reduce the device rating or increase conductor ampacity
BLeave it because feeders are never protected at their supply end
CRelabel the conductors with a higher temperature
DIncrease only the equipment-grounding conductor

Why A is correct

Feeder conductors require overcurrent protection coordinated with their allowable ampacity unless a specific permission applies. Relabeling field insulation or changing an unrelated grounding conductor does not protect undersized current-carrying conductors.

2. A feeder supplies a panel in a separate building and includes an equipment-grounding conductor. How should the downstream panel normally be arranged?

AOmit the equipment-grounding conductor
Isolate neutral; bond grounds to the enclosure
CUse the neutral as the grounding electrode conductor
DBond neutral and ground together in the panel

Why B is correct

With an equipment-grounding conductor run with the feeder, the grounded conductor normally stays isolated at the downstream building disconnect or panel while equipment grounds bond exposed metal. Rebonding creates parallel neutral-current paths.

3. A metal raceway section in a feeder is not reliable for grounding continuity. What should the installer provide?

AA neutral bond in every downstream panel
BPaint across the loose fitting
An approved continuous grounding path
DA smaller phase conductor

Why C is correct

Feeder faults require a low-impedance path back to the source so the protective device opens. An incidental metal contact or downstream neutral bond is not an acceptable substitute for an effective equipment-grounding path.

4. A feeder supplies a detached shop. In addition to the feeder equipment grounding conductor, what grounding provision is generally required at the shop?

A grounding electrode system connected at the building
BA second utility service drop
CA neutral bond at every panel
DNo electrode when a feeder is used for the feeder and operating condition described

Why A is correct

A building supplied by a feeder generally requires a grounding electrode system connected to the building disconnect or grounding system. The feeder equipment grounding conductor remains essential, and neutral isolation rules still apply.

5. A feeder supplies a panel where both grounded and ungrounded conductors could be confused with another voltage system. What should be provided?

AOnly a handwritten jobsite note
Permanent identification of the conductor system
CA larger equipment grounding conductor for the feeder and operating condition described
DTemporary tape on the panel cover

Why B is correct

Where multiple nominal voltage systems are present, ungrounded conductors require identification by phase and system, with the method posted or documented as required. Identification supports safe operation and maintenance.

6. Where is feeder overcurrent protection generally placed?

AOnly at the final receptacle
BAt every conductor support
At the point where the feeder receives its supply
DPast the last utilization load

Why C is correct

A feeder is generally protected where it receives its supply, subject to specific tap and transformer-secondary rules. Downstream protection alone may leave upstream feeder conductors unprotected.

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