25+ terms every TX journeyman needs cold.

How much current a conductor can carry continuously without overheating its insulation. Measured in amps.

Table 310.16 is where most ampacity questions land. Different insulation, different number.

Connecting metal parts together so they stay at the same voltage. Different from grounding.

Bonding stops a hot enclosure from killing you when something goes wrong. The bond keeps everything that could carry fault current at the same potential.

The wiring from the breaker to the last outlet. Article 210 covers it.

Most TDLR questions about ampacity, GFCI, AFCI, and continuous loads live here. Branch circuits are downstream of the panel.

A load that runs for three hours or more at maximum current.

The 125 percent multiplier rule applies. Easy two points lost when guys forget this on the exam.

A multiplier that reduces a calculated load because not every appliance runs at the same time.

Dwelling lighting demand and household range demand are the two big tables to know cold.

The bare or green wire that bonds metal parts back to the breaker so a fault trips the overcurrent device.

Sized from Table 250.122 by the rating of the breaker, not by the load amps.

The conductor between the service equipment and a downstream panel that supplies branch circuits.

Sized differently from branch circuits. Feeder is upstream of the panel; branch is downstream.

A device that shuts off power when current leaks to ground. Trips at 4 to 6 milliamps.

Required in bathrooms, kitchens, garages, outdoor receptacles, and other listed locations. Search for the full term in the index, not just GFCI.

A device that shuts off power when it detects the electrical signature of an arc, the kind that starts fires.

Required on most dwelling branch circuits, including bedrooms, family rooms, dining rooms, and kitchens.

The neutral. The white or gray wire that carries unbalanced current back to the source.

Watch for 'grounded' versus 'grounding.' One letter changes the article and the answer.

The wire that connects the service to the grounding electrodes: rods, water pipe, ground ring, or concrete-encased electrode.

Sized from Table 250.66 by the largest ungrounded service conductor. Capped at 6 AWG copper to a rod, 4 AWG copper to a concrete-encased electrode.

Light fixture. The NEC and the index use this word, not 'fixture' and not 'light.'

If you search for 'fixture' on a luminaire question you will wander. Use the Code's vocabulary.

A circuit with two or more ungrounded conductors that share a common neutral.

Requires simultaneous disconnect of all ungrounded conductors. The neutral pigtail rule applies at every device.

Any point on the wiring system where current is taken to supply equipment. Broader than 'receptacle.'

A lighting outlet is not a receptacle outlet. Watch the qualifier on the exam.

The fuse or breaker. The NEC says OCPD; jobsite says 'breaker' or 'fuse.'

Standard ampere ratings sit in Table 240.6(A). Tab that table.

Any conduit, EMT, PVC, or pathway built to carry conductors. Covers a lot of ground.

Chapter 9 Tables 1, 4, and 5 are the conduit fill math. One conductor 53 percent, two 31, more than two 40.

The contact device installed at the outlet for the connection of an attachment plug.

Search for 'receptacles' in the index, not 'plugs' and not 'outlets.' Plugs are attachment plugs.

The conductors and equipment that deliver electricity from the utility to the wiring system on the customer side.

Service rules apply only on the line side of the service disconnect. Once you cross the disconnect, different rules.

The conductors that run from the service drop or service lateral to the service equipment.

Different rules than feeders. Tab Article 230 to keep them separate.

An unintended low-resistance path between two conductors that should not be touching. Trips the breaker fast.

Different from a ground fault. Short circuit is hot to neutral or hot to hot. Ground fault is hot to a grounded surface.

An unintended path between an ungrounded conductor and any grounded surface, including the EGC.

GFCI devices catch low-current ground faults that wouldn't trip a breaker. Different protection, different threshold.

A conductor that connects to an existing circuit at a point other than the overcurrent device.

Tap rules in 240.21 are exam favorites. The 10-foot tap rule and the 25-foot tap rule have different conditions.

The voltage lost across a conductor due to its resistance. Calculated from K factor, current, distance, and circular mils.

Branch circuit recommendation is 3 percent. Combined branch and feeder is 5 percent. Informational notes, not mandatory rules, but TDLR tests the math.

The clear area required in front of electrical equipment for safe operation and maintenance.

Width, depth, and height are all spelled out. Table 110.26(A)(1) is your friend.

A location subject to saturation with water or other liquids. Underground, in concrete in direct contact with earth, or unprotected outdoors all qualify.

Different from a damp location. Wet locations require wet-rated conductors and equipment.