NEC 210.4(B)

NEC 210.12(A)

This installation is fully code-compliant. NEC 210.12(A) requires AFCI protection for all 120V, 15A and 20A branch circuits supplying outlets and devices in dwelling unit bedrooms. A 15A combination-type AFCI breaker with 14 AWG wiring is correctly matched (NEC Table 310.16 rates 14 AWG at 15A). Tamper-resistant receptacles are required per NEC 406.12 in all dwelling unit locations. This is a textbook installation that IBEW halls use as a baseline example of proper bedroom circuit design.

NEC 210.19(A) Informational Note / high-rise office Single Line Diagram

This branch circuit EXCEEDS the enforced 3% maximum, so it is not compliant. Calculation (single-phase): Vd = 2 x I x R x L / 1000 = 2 x 20A x 1.93 x 85 / 1000 = 6.56V. The circuit is 120V nominal, so VD% = 6.56V / 120V x 100 = 5.47% — NOT 2.7% (2.7% only results from erroneously dividing by 240V, the wrong nominal for a 120V circuit). At 5.47% the drop exceeds both the project-enforced 3% branch maximum and the NEC 210.19(A) Informational Note 3% recommendation. To meet 3% (3.6V max) at 20A over 85 ft would require roughly 8 AWG copper, or the load/length must be reduced.

NEC 210.20(A)

NEC 210.20(A) requires that continuous loads (3+ hours, which applies to IT equipment) not exceed 80% of the branch circuit breaker rating. Loading to 95% will cause nuisance tripping and violates the continuous load derating requirement.

NEC 210.52(B)(1)

The NEC requires a minimum of two 20A small appliance branch circuits to serve the kitchen countertop receptacles. A refrigerator is permitted (but not required) to be on one of these circuits. However, best practice is to provide a dedicated circuit for the refrigerator so that a tripped breaker on the small appliance circuit does not de-energize the refrigerator and spoil food.

NEC 210.52(H)

This installation passes. NEC 210.52(H) requires at least one receptacle outlet in a dwelling hallway 10 feet or more in length — this 12-foot hallway has one, so the requirement is met. The 6-foot spacing rule of NEC 210.52(A) applies to the wall space of habitable rooms (kitchens, bedrooms, living areas), NOT to hallways. Knowing which spaces each part of 210.52 governs is the whole game: halls need one outlet, habitable-room wall space needs the 6-foot rule.

NEC 210.8(A)(1)

All 125V, 15- and 20-amp receptacles in a bathroom must have GFCI protection to protect against shock near water.