Residential Electrical Trade Knowledge (Residential Journeyman/Master Electrician)
Dwelling-unit focus
Residential questions center on the specific rules for one- and two-family dwellings: receptacle spacing and placement, small-appliance and laundry circuits, GFCI and AFCI protection, bathroom and kitchen requirements, grounding electrode systems, and the optional dwelling calculation method. Knowing where the code is prescriptive (receptacle spacing) versus performance-based (load calc) matters.
Concepts to master
- Receptacle spacing: general living areas require receptacles so no point along the wall is more than 6 ft from one; kitchen countertops have their own spacing and island/peninsula rules.
- Small-appliance and laundry: two or more 20 A small-appliance branch circuits; laundry has its own circuit.
- GFCI: bathrooms, kitchens, garages, outdoors, laundry, and other specified locations; know the list and the exceptions.
- AFCI: bedroom and other specified branch circuits per the adopted code edition.
- Grounding: rod, metal water pipe, concrete-encased electrode, and bonding of metal piping systems.
Traps to expect
Questions test the 6 ft / 12 ft receptacle logic and whether a fixed appliance or doorway interrupts the wall space. GFCI versus AFCI mix-ups are common - a bathroom needs GFCI, not AFCI, in most editions. Watch for "within 6 ft of a sink" wording and for whether a receptacle is required versus permitted. Dwelling load calculations often include demand factors that candidates forget to apply.
Worked example
A 20 ft living-room wall with a doorway in the middle: measure each wall segment separately. Each segment must have a receptacle so no point is more than 6 ft from a receptacle, and any segment 2 ft or wider generally needs one. A 20 ft wall split into two 10 ft segments needs at least one receptacle per segment, typically placed so the 6 ft rule is satisfied from each end.
Rule of thumb
For general wall space, divide the wall into 12 ft increments - every 12 ft of wall needs at least one receptacle to satisfy the 6 ft rule.