Solid understanding of critical electrical and mechanical systems, including medium- and low-voltage distribution, generators, UPS, switchgear, automatic transfer switches, chillers, CRAH/CRAC, and building-management and power-monitoring (BMS/EPMS) controls or comparable critical power, distribution, and control systems. On data center engagements this includes utility feeds, generators, UPS systems, switchgear, automatic transfer and paralleling controls, chillers, CRAH/CRAC units, pumps, and BMS/EPMS controls; on other critical infrastructure it may include analogous power, distribution, environmental, and control systems.