OR Electrician case studies
OR Electrician · Put your knowledge to work in context.
The Oregon electrician licensing exam is the credentialing pathway for electricians who want to work as journeyman or master electricians under Oregon's electrical program, which is administered by the Building Codes Division (BCD) of the Oregon Department of Consumer and Business Services. The exam is built around five bodies of knowledge: the National Electrical Code (NFPA 70), the Oregon Electrical Specialty Code, Oregon statutes and administrative rules governing electrical work, electrical theory and load calculations, and installation safety and trade practices. The OR Electrician case studies are 5 cases and about 4,551 words.
1Service Upgrade for a 1,500 sq ft Dwelling Adding an EV Charger
A homeowner in Springfield, Oregon, has a 1,500 sq ft single-family dwelling served by a 120/240 V, single-phase, 100 A overhead service. Connected loads are a 12,000 VA range, 5,500 VA dryer, 4,500 VA water heater, 1,200 VA dishwasher, 900 VA disposer and 1,500 VA microwave/hood, plus the general lighting load and the two small-appliance and one laundry branch circuits.
877 words, about 4 min2Multi-Wire Branch Circuit in a Coffee Shop Panel
A 900 sq ft coffee shop is served by a 208Y/120 V, 3-phase, 4-wire panel. For a row of counter receptacles the installer ran one 12/3 NM cable, landing the black on phase A (breaker 8), the red on phase B (breaker 10), and the shared neutral on the neutral bar.
913 words, about 5 min3Three Jobs, One Apprentice: Oregon Licensing and Supervision
A property-management firm in Bend hires a licensed electrical contractor for three jobs in one week: replacing a failed 240 V dryer receptacle in a rented duplex, installing a 50 A hot tub disconnect and bonding grid at the owner's own residence, and troubleshooting a 480 V motor control center bucket at a sawmill, where the plant's limited maintenance electrician has already opened the bucket. The contractor's only field employee is a first-year apprentice; the journeyman is on vacation.
862 words, about 4 min4260 ft Feeder to a Detached Shop: Ampacity Versus Voltage Drop
A 200 A service on a house must supply a detached 800 sq ft shop through a 260 ft one-way trench run. The calculated shop demand load is 78 A at 240 V single-phase: a 5 hp table saw as the largest motor, a 9,600 W electric unit heater, and 2,400 VA of lighting and general receptacles.
937 words, about 5 min51960s Service: Flickering Lights, a Tingle at the Sink, and a New Dishwasher Circuit
A journeyman and a second-year apprentice arrive at a 1962 ranch house to add a dedicated 20 A circuit for a new dishwasher. The service is a rusty 100 A panel in the garage with a 60 A backfed breaker used as the main; no grounding electrode conductor is visible, the water service was re-piped in plastic last year, and the only ground clamp is on an abandoned galvanized stub.
962 words, about 5 min