NEC 210.12(A)

NEC 110.26(D)

Working space around service equipment rated 600V or less requires illumination. An electrician must be able to see clearly when operating breakers or performing maintenance.

NEC 110.27 / NFPA 70E

Battery cabinets must remain closed to prevent accidental contact with live DC bus bars and to contain any thermal event. Open cabinets also violate NEC 110.27 regarding guarding of live parts and create arc flash hazards.

NEC 210.11(C)(3)

NEC 210.11(C)(3) requires at least one 20A branch circuit to supply bathroom receptacle outlets. This circuit is permitted to supply receptacles in multiple bathrooms. The key restriction is that no other outlets (lights, exhaust fans, etc.) from other rooms can be on this circuit — it must serve only bathroom receptacles. GFCI protection is separately required by NEC 210.8(A)(1).

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 210.4(B)

When a shared neutral (multi-wire branch circuit) is used, the neutral must be identified as to which circuits it serves. Additionally, simultaneous disconnect of all ungrounded conductors sharing the neutral is required.