NASCLA Journeyman Electrician case studies
NASCLA Journeyman Electrician · Put your knowledge to work in context.
The NASCLA Journeyman Electrician credential is a certification exam used to demonstrate that an electrician has the code knowledge and practical judgment expected of a journeyman-level craftsperson. It is typically pursued by electricians who have completed an apprenticeship or accumulated supervised field hours and who want a portable, third-party validation of their competence, often alongside state or local licensing requirements. The NASCLA Journeyman Electrician case studies are 5 cases and about 3,598 words.
1The 175 A Conductor on a 200 A Service
A single-family dwelling gets a 200 A, 120/240 V single-phase service. The Article 220 load calculation totals 178 A.
734 words, about 4 min2Rooftop Unit Nuisance Tripping
A packaged rooftop HVAC unit on a 208/230 V single-phase supply has a nameplate reading: Minimum Circuit Ampacity 41.2 A, Maximum Overcurrent Protection 60 A, compressor RLA 26.4 A, outdoor fan FLA 2.8 A. The crew installs 8 AWG copper THWN-2 in EMT from a 60 A breaker in the building panel to a 60 A non-fused pullout disconnect on the roof, within sight of the unit.
682 words, about 3 min3Detached Garage Subpanel With a Bonded Neutral
A 100 A subpanel in a detached garage is fed from the house with 1/0 aluminum XHHW-2 four-wire: two ungrounded conductors, a neutral, and a green equipment grounding conductor, protected by a 100 A breaker. In the garage panel, the installer drove the green bonding screw through the neutral bar into the enclosure and landed the grounding electrode conductor for two driven rods on the same neutral bar.
723 words, about 4 min445 kVA Transformer Feeding a Remote Panel
A dry-type 45 kVA transformer with a 480 V three-phase delta primary and a 208Y/120 V three-phase secondary is fed from a 70 A breaker in the main switchboard. Secondary conductors are 2/0 copper THWN-2 in 18 ft of EMT terminating in a 150 A main breaker in a panelboard located in the same room.
755 words, about 4 min5Energized Troubleshooting at a 480 V MCC
A production line is running when a 400 A combination starter bucket in a 480 V motor control center begins nuisance tripping. The plant electrician is told to open the bucket door and take voltage and current readings on the line and load side of the starter to find the problem.
704 words, about 4 min