Uptime Institute Tier I - Constructed Facility

The facility must maintain at least two independent electrical feeds from the utility service provider or multiple utility connections entering the site, ensuring that loss of a single utility feed does not cause facility shutdown.

These feeds must be physically segregated and enter through different cable routes or conduits to prevent common-cause failures from physical damage.

Distribution infrastructure downstream must support the ability to transfer critical loads between feeds without automatic or manual disconnection of power to equipment.

A minimum viable UPS system must be installed to condition electrical supply and provide continuity during utility fluctuations, sags, surges, and momentary outages.

The UPS must support runtime sufficient to allow graceful shutdown of IT equipment or transfer to backup power generation, with Tier I typically requiring 5-15 minutes of UPS battery backup at full facility load.

The UPS topology must include dual-bus architecture or at least two independent UPS modules to provide single-path redundancy aligned with Tier I topology requirements.

Cooling systems must be designed to deliver temperature and humidity control through one primary distribution path (distinguishing it from N+1 redundant cooling in higher tiers), with the explicit acknowledgment that maintenance activities will require scheduled downtime.

Hot aisle/cold aisle containment is required to optimize cooling efficiency and prevent recirculation, and cooling capacity must be dimensioned to handle IT equipment loads plus thermal growth within a 5-year planning window.

All cooling maintenance must be scheduled during planned maintenance windows with advance notification and IT workload coordination to prevent unscheduled outages.

The electrical infrastructure must support 24/7 operation without automatic shutdowns, with all critical distribution components (switchgear, distribution panels, branch circuits) rated for continuous duty cycles.

The facility must implement automatic transfer switches (ATS) to seamlessly transition between utility power, UPS, and backup generator with no perceptible interruption to IT equipment.

Electrical monitoring and control systems must provide real-time visibility into utility voltage, frequency, load distribution, and power factor to enable proactive corrective actions before equipment shutdowns occur.

Diesel or alternative fuel backup generators must be installed with sufficient capacity to support the facility's critical load plus a margin for transient demands, sized to accommodate IT equipment loads during peak operational periods.

Generators must include automated start-on-demand capability triggered by utility loss detection, with testing protocols requiring monthly exercise under load and annual full-load testing.

Fuel supply systems must maintain minimum 48-hour runtime capacity on-site, with documented replenishment procedures and supplier contracts ensuring fuel availability during extended outages.

Systems supporting facility operations but not directly involved in IT service delivery (HVAC controls, lighting, security access systems) must be segregated from critical power and cooling infrastructure to prevent cascading failures.

Non-critical systems may be powered from single utility feeds or circuits without redundancy, provided they do not impact the availability of critical paths.

This segregation allows Tier I facilities to minimize infrastructure investment while maintaining critical-path reliability and supports the philosophy that basic infrastructure redundancy can be achieved without over-engineering entire facilities.

The facility site must incorporate basic resilience measures including protection from external environmental threats such as flooding, severe weather, and seismic events through appropriate building siting, construction standards, and supplementary protections (elevated critical equipment, waterproofing, seismic bracing for equipment racks).

Environmental monitoring systems must include temperature, humidity, water intrusion detection, and fire suppression with automated alerts enabling rapid response to environmental deviations.

Access to critical infrastructure areas must be restricted through physical security controls (keyed access, badge readers) with audit trails documenting personnel entry to power and cooling plant areas.

Facilities must establish and document formal scheduled maintenance windows (typically quarterly for Tier I) communicated in advance to customers, allowing workload migration or graceful degradation during maintenance periods.

Change management procedures must require pre-maintenance verification that non-critical IT workloads are offline and that sufficient UPS runtime exists if utility work occurs simultaneously.

Post-maintenance testing must verify restoration of redundant power feeds, UPS functionality, generator operation, and cooling system performance before returning to standard operational status, with documented test results retained for audit purposes.