Wire Up the Building

The electrical and mechanical contracting layer is where the building shell becomes a functional data center. EMCOR, Quanta Services, Comfort Systems USA, and IES Holdings install the medium-voltage switchgear (from L15), the busway distribution, the cooling piping (from L19), and the fire suppression systems. This is skilled trades work — electricians, pipefitters, controls technicians — and the labor market is extremely tight.

Quanta Services has the broadest capability: electrical transmission (grid connection), substation installation, and interior data center wiring. They're uniquely positioned because they can handle everything from the utility interconnect at the property line to the busway inside the server hall. Sterling Infrastructure and MYR Group handle the specialized high-voltage work.

The 800V Power Architecture trend creates incremental complexity for this layer. Wiring an 800V DC bus system requires different cable gauges, different safety protocols, different testing procedures, and different certifications than traditional 480V AC systems. The workforce must be retrained, and the inspection/commissioning process takes longer. This is another source of schedule pressure that doesn't compress with demand.

The Liquid Cooling Mandate adds a second dimension of complexity. Traditional data centers needed electrical contractors. AI data centers need electrical AND mechanical contractors — piping, manifolds, CDU connections, leak detection systems. This nearly doubles the scope of work in L17 compared to a traditional build, which extends timelines and increases the labor bottleneck.