Master Electrician case studies
Master Electrician · Put your knowledge to work in context.
A Master Electrician license is the highest tier of electrician credential issued by state or local licensing boards in the United States. Where a journeyman license authorizes hands-on installation work under supervision, the master tier typically authorizes the holder to design and supervise installations, pull permits, sign contracts for electrical work, and in many jurisdictions to own or qualify an electrical contracting business. The Master Electrician case studies are 5 cases and about 3,778 words.
1Service Upgrade for a 2,400 sq ft Dwelling (and the EV Charger That Comes Later)
This is a service replacement for a 2,400 sq ft single-family dwelling with a 240/120 V single-phase service. Connected loads are: one 12 kW electric range (nameplate rating), a 5,000 W electric clothes dryer, a 4,500 W storage-type water heater, a 1,200 VA dishwasher, a 15 kW electric furnace, and a 5 kW central air conditioner that is interlocked so it never runs at the same time as the furnace.
624 words, about 3 min225 hp Conveyor Motor Tripping on Acceleration
A 25 hp, 480 V, three-phase, design B, totally enclosed fan-cooled conveyor motor has a nameplate full-load current of 32.0 A, a service factor of 1.15, and a terminal housing rated 75°C. The branch circuit is 8 AWG THWN-2 copper in EMT protected by a 90 A inverse-time circuit breaker; a thermal overload relay in the starter is set at 34 A.
727 words, about 4 min3Detached Workshop: Grounding Electrode System and Feeder EGC
A 30 ft x 40 ft detached workshop is fed from a dwelling by a 100 A feeder: two 1/0 AWG aluminum ungrounded conductors, one 1/0 AWG aluminum neutral, and a 6 AWG copper equipment grounding conductor, installed in Schedule 80 PVC in a 24 in deep trench. The subpanel has separate neutral and ground bars.
760 words, about 4 min418 ft Feeder Tap to a Second-Floor Panel with an Unverified Series Rating
A 400 A, 480Y/277 V switchboard in a first-floor electrical room feeds a 100 A panelboard on the second floor. The tap conductors are 1/0 AWG copper THWN-2 in EMT, 18 ft of conductor length, terminating in the 100 A main breaker of the panelboard.
790 words, about 4 min5Plan Review: Tenant Panel Location, Working Space, and a Continuous-Duty Espresso Machine
You are reviewing plans for a 1,400 sq ft coffee shop tenant build-out. The 208Y/120 V, three-phase tenant panel is a 24-circuit, 100 A main-breaker panel rated 22 kAIC, shown on the rear wall of a 5 ft x 8 ft storage room that also contains a mop sink and metal shelving.
877 words, about 4 min