NEC Electrical Engineering case studies
NEC Electrical Engineering · Put your knowledge to work in context.
The NEC Electrical Engineering credential is a multiple-choice certification exam for electricians, electrical engineers, inspectors, and facilities personnel who need to demonstrate working command of the National Electrical Code and its application to real installations. It tests code administration and general requirements, wiring methods and materials, branch-circuit and feeder/service calculations, grounding and bonding, overcurrent protection and coordination, motors and HVAC equipment, special occupancies and equipment, special conditions and classified locations, and safety, inspection, and compliance practice. The NEC Electrical Engineering case studies are 5 cases and about 2,846 words.
1Service Upgrade for a Growing Restaurant
A restaurant owner wants to add a 12 kW commercial range and two 5 kW fryers to an existing 120/240 V single-phase service. The existing service is 200 A with a calculated load of 150 A.
419 words, about 2 min2Grounding Electrode System for a New Building
A new commercial building has a 1200 A, 480Y/277 V service. The building has a concrete-encased electrode (CEE) with 4 AWG bare copper, a metal water pipe with 10 ft buried, and a ground ring with 2 AWG bare copper encircling the building.
507 words, about 3 min3Motor Branch Circuit and Overload Protection
A 50 HP, 460 V, 3-phase, 60 Hz induction motor has a nameplate full-load current of 62 A, service factor 1.15, and temperature rise 40°C. The motor is supplied by a feeder with 4 AWG THHN copper conductors.
494 words, about 2 min4Hazardous Location Classification for a Paint Booth
A paint booth uses a solvent with a flash point of 100°F and a boiling point of 300°F. The booth is a closed-top, open-face design with a 4 ft opening.
620 words, about 3 min5Emergency System Generator Sizing and Load Testing
A hospital requires an emergency system per NEC Article 517. The essential electrical system includes a 200 kW diesel generator.
806 words, about 4 min