UL 2755
Outline of Investigation for Modular Data Centers

DETAILS
Edition Number:2SCC Approved:--
Edition Date:2018-07-18DOD Approved: --
Price Code:AANSI Approved: --
Type:outline

  • SCOPE

    1 Scope

    1.1 This Outline of Investigation covers Modular Data Centers (MDC). The Modular Data Centers covered by these requirements are pre-fabricated units consisting of an outer enclosure housing ITE and various support equipment such as electrical service and distribution equipment, HVAC systems and the like. Some configurations may have the support equipment housed in a separate enclosure. A typical construction may use a standard ISO shipping container or other structure as the outer enclosure, racks or cabinets of ITE, NEC compliant service entrance equipment and power distribution components, power storage such as a UPS and an air or liquid cooling system.

    1.2 These factory-built modules incorporate pre-installed materials and equipment which, after installation, may be concealed and may not be accessible for inspection at the final installation site.

    1.3 The modular data centers covered by these requirements are intended for fixed installation either indoors or outdoors based on their construction and resistance to environmental conditions. MDCs intended for outdoor use shall be identified with a NEMA environmental class rating.

    1.4 These requirements are intended to demonstrate compliance with the National Electrical Code (NEC), NFPA 70 and other national Codes such as Building, Fire, Plumbing, Mechanical, and the like. Where state or local codes differ from the national codes anticipated by these requirements, determining compliance with these codes is the responsibility of the local authority having jurisdiction.

    1.5 When these requirements do not cover a specific technology or construction feature, the applicable requirements of the National Codes shall be used.

    1.6 This Outline of Investigation assumes that the final installation of the MDC will be performed by qualified service personnel in accordance with the applicable installation instructions, installation practices and national installation codes. These MDCs are intended for installation subject to approval by the Authority Having Jurisdiction.

  • TABLE OF CONTENTS
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    • Outline Title Page
    • Table of Contents
      • Body
        • 1 Scope
        • 2 Equipment, Sub-Assemblies and Components
        • 3 Units of Measurement
        • 4 Undated References
        • 5 Glossary
        • 6 Electrical
          • 6.1 General
          • 6.2 Electrical supply and distribution
          • 6.3 Wiring and protection
          • 6.4 Wiring methods and materials
          • 6.5 Field wiring compartments
          • 6.6 Field Wiring Terminals
          • 6.7 Wire bending space
          • 6.8 Flexible cable
          • 6.9 Separation of circuits
          • 6.10 Disconnecting means
          • 6.11 Service equipment – services rated 600 V or less
          • 6.12 Panelboards and switchboards
          • 6.13 Power transformers
          • 6.14 Receptacles
          • 6.15 Lighting
          • 6.16 Emergency lighting
          • 6.17 Intrusion alarms
        • 7 Grounding
          • 7.1 General
          • 7.2 Grounding terminals and connectors
          • 7.3 Identification of equipment grounding conductors and terminals
        • 8 Working Space
          • 8.1 General
          • 8.2 Equipment operating at 600 Volts, nominal, or less
          • 8.3 ITE
          • 8.4 Working space markings
        • 9 Battery Supplies and Ventilation
          • 9.1 General
          • 9.2 Batteries
          • 9.3 Battery mounting
          • 9.4 Battery enclosure and enclosure venting
          • 9.5 Hydrogen detection system
          • 9.6 Work areas and working space around batteries
          • 9.7 Replaceable batteries
          • 9.8 Battery supply performance
        • 10 General Construction
          • 10.1 Materials
          • 10.2 Glass covered openings
          • 10.3 Installed equipment
          • 10.4 Mechanical hazards
        • 11 Enclosures
          • 11.1 Materials
          • 11.2 Certified ISO type shipping containers
          • 11.3 Other types of MDC enclosures
          • 11.4 Doors
          • 11.5 Floors
          • 11.6 Stacking
        • 12 Exit Routes
          • 12.1 General
          • 12.2 Exit doors
          • 12.3 Number of exit routes
          • 12.4 Secondary exits
          • 12.5 Height and width requirements
          • 12.6 Emergency exit identification
        • 13 Fire Detection and Suppression
          • 13.1 Smoke/fire detection/protection
          • 13.2 Fire suppression systems
          • 13.3 Fire resistance rating
        • 14 Environmental Considerations
          • 14.1 General
        • 15 HVAC
          • 15.1 General
          • 15.2 Room type air conditioners
          • 15.3 Stationary air conditioning systems
          • 15.4 Fixed electric space heating equipment
          • 15.5 Cooling system plumbing and piping
        • 16 Noise Exposure
        • 17 Product Assembly
          • 17.1 General
          • 17.2 Shipping unassembled
          • 17.3 Field installed accessories
          • 17.4 Assembly test
          • 17.5 MDCs not fully configured
        • 18 Performance
          • 18.1 General
          • 18.2 Temperature test
          • 18.3 Dielectric voltage-withstand test
          • 18.4 Transport and handling – vertical impact test
        • 19 Markings
          • 19.1 General
          • 19.2 ITE and other load equipment electrical rating marking
          • 19.3 Field wiring terminal markings
          • 19.4 Panelboard and switchboard markings
        • 20 Instructions
    • APPENDIX A (Normative)