NEC 620.37 / IMC 602.2

NEC 517.33 / NEC 517.34

This fails code. NEC 517.33 and 517.34 specifically require nurse call systems, task illumination in patient care areas, and selected receptacles at patient bed locations to be connected to the critical branch of the essential electrical system. These loads are not optional — they must be on the critical branch regardless of generator capacity concerns. During a utility outage, patients on monitors and ventilators need powered receptacles, nurses need call system notification, and clinical staff need task lighting. If the generator cannot handle the full essential system load, the generator must be upgraded — not the load assignments reduced.

NEC 590.4(D) / high-rise office Specification

The high-rise commercial office specification requires all panels and breakers used for temporary lighting to be clearly labeled. Unlabeled temporary power creates confusion about which circuits are temporary vs. permanent and risks leaving construction power live during turnover.

NEC 590.6(A) / high-rise office Specification

This temporary power installation is code-compliant. NEC 590.6(A) requires GFCI protection for all 125V, 15A and 20A receptacle outlets used for temporary power during construction. The high-rise office specification additionally requires clear labeling of all temporary panels and breakers. Properly labeled temporary power ensures systematic removal at project completion and prevents confusion with permanent circuits during final inspection. The contractor must remove all temporary stringers, lamps, outlets, breakers, and fusing at completion per high-rise office specifications.

NEC 645.10

This satisfies NEC 645.10. Article 645 is an optional set of alternate rules for an IT equipment room, and one of the conditions for using it is a disconnecting means that will remove power from all electronic equipment in the room and shut down the dedicated HVAC serving it, with the controls grouped, identified, and readily accessible at the principal exit doors. The logic is a firefighter's: someone should be able to kill the load and the air moving through it on the way out, without hunting through a dark room full of energized cabinets.

NEC 645.5 / NEC 300.22

This fails code. When the space under a raised floor is used as an air-handling plenum — which is the standard cooling configuration in data centers — NEC 300.22 and NEC 645.5 restrict the types of wiring methods permitted. Standard NM-B cable is not rated for plenum use because its PVC jacket produces toxic smoke and fumes when exposed to fire. Only plenum-rated cables (such as Type DP), wiring enclosed in metal conduit, or other listed wiring methods specifically approved for plenum spaces are permitted. This requirement exists because toxic smoke spread through the air distribution plenum could rapidly contaminate the entire data center and endanger personnel.

NEC 645.5(E)(2)(5)

The deciding fact is the fire suppression system, not the airflow. NEC 645.5(E)(2)(4) PERMITS Types CL2, CL3, CM and CMG under a raised floor where the air space is protected by an automatic fire suppression system — the normal condition in a modern data hall. Only where that space is NOT protected does 645.5(E)(2)(5) narrow the allowance to substitute Type CMP. Article 645 exists precisely to relax the ordinary plenum-cable rule inside a qualifying IT equipment room, so reaching for the general rule here gets it backwards.