NCCER Electrical case studies
NCCER Electrical · Put your knowledge to work in context.
NCCER Electrical is the electrical craft area within NCCER's construction education and assessment programs. NCCER - the National Center for Construction Education & Research, an independent 501(c)(3) nonprofit founded in 1996 - delivers craft training through standardized, modular curricula and, through its National Craft Assessment and Certification Program (NCACP), assesses both the knowledge and the hands-on skill of current craft professionals against industry standards. The NCCER Electrical case studies are 5 cases and about 4,643 words.
1The Circuit That Would Not Die: A Shared Neutral in an Office Remodel
A remodel crew is converting a suite of offices in a strip mall. The receptacles are fed by three 12/3 NM cables leaving a 120/240 V panel; each cable's two ungrounded conductors land on separate single-pole 20 A breakers in non-adjacent spaces and share one neutral.
817 words, about 4 min2Box Fill in a Tiled Kitchen: Does the Box Pass?
deep steel box (Table 314.16(A) volume 30.3 cu in.) is set in a tiled kitchen backsplash for a countertop receptacle. Four 12/2 NM cables enter through the box's two internal cable clamps: two from the panel side, one feeding the next counter outlet, and one running down to a dishwasher switch.
862 words, about 4 min3The 180 ft Well Pump: Code-Minimum Conductor, Real-World Failure
A 5 hp, 230 V single-phase submersible well pump serves a rural house. The nameplate reads 28 A, matching the tabulated full-load current for a 5 hp, 230 V single-phase motor.
913 words, about 5 min4Detached Garage Feeder: One Ground Rod, a Green Screw, and 20 ft of Rebar
A 60 A feeder runs 70 ft from a house panel to a detached garage. It consists of two 6 AWG Cu ungrounded conductors, a 6 AWG neutral, and a 10 AWG Cu equipment grounding conductor, all THWN in PVC conduit, terminating in a 12-space panel with a 60 A main breaker.
1,021 words, about 5 min510 hp at 480 V: Nameplate, Table FLC, and the Overload That Keeps Tripping
A 10 hp, 480 V, 3-phase, design B compressor motor drives a shop air system. Nameplate: 13.0 A at 480 V, service factor 1.15, rated for 40 C ambient.
1,030 words, about 5 min