1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJuly 18, 20181UL 2755Outline of Investigation for Modular Data CentersIssue Number: 2July 18, 2018Summary of TopicsThis is the Second Issue of the Outline of Investigation for Modular DataCenters
2、, Subject 2755, which covers pre-engineered data center modulesconsisting of an outer cabinet or container that houses informationtechnology equipment (ITE) and various support equipment such aselectrical service and distribution equipment, HVAC systems and the like.ULs Outlines of Investigation are
3、 copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPY
4、RIGHT 2018 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 18, 2018UL 27552No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTS1 Scope .52 Equipment, S
5、ub-Assemblies and Components 53 Units of Measurement .64 Undated References 65 Glossary .66 Electrical .96.1 General .96.2 Electrical supply and distribution 96.3 Wiring and protection 106.4 Wiring methods and materials .106.5 Field wiring compartments 106.6 Field Wiring Terminals .116.7 Wire bendin
6、g space .156.8 Flexible cable .166.9 Separation of circuits 166.10 Disconnecting means .186.11 Service equipment services rated 600 V or less 196.12 Panelboards and switchboards .206.13 Power transformers .246.14 Receptacles .256.15 Lighting .256.16 Emergency lighting .276.17 Intrusion alarms .287 G
7、rounding 287.1 General 287.2 Grounding terminals and connectors .297.3 Identification of equipment grounding conductors and terminals .308 Working Space 318.1 General 318.2 Equipment operating at 600 Volts, nominal, or less 328.3 ITE 328.4 Working space markings .339 Battery Supplies and Ventilation
8、 339.1 General 339.2 Batteries .339.3 Battery mounting 349.4 Battery enclosure and enclosure venting .359.5 Hydrogen detection system .369.6 Work areas and working space around batteries 379.7 Replaceable batteries 379.8 Battery supply performance .3810 General Construction 4010.1 Materials 4010.2 G
9、lass covered openings 4010.3 Installed equipment .4110.4 Mechanical hazards 4211 Enclosures .4211.1 Materials 4211.2 Certified ISO type shipping containers 4311.3 Other types of MDC enclosures .4411.4 Doors .49JULY 18, 2018 UL 2755 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORD
10、ISTRIBUTION WITHOUT PERMISSION FROM UL11.5 Floors .4911.6 Stacking 4912 Exit Routes 5012.1 General .5012.2 Exit doors .5012.3 Number of exit routes .5112.4 Secondary exits 5112.5 Height and width requirements .5212.6 Emergency exit identification .5313 Fire Detection and Suppression 5413.1 Smoke/fir
11、e detection/protection 5413.2 Fire suppression systems .5413.3 Fire resistance rating .5414 Environmental Considerations 5414.1 General .5415 HVAC .5515.1 General .5515.2 Room type air conditioners 5515.3 Stationary air conditioning systems .5615.4 Fixed electric space heating equipment .5715.5 Cool
12、ing system plumbing and piping 5716 Noise Exposure 5917 Product Assembly 6017.1 General .6017.2 Shipping unassembled 6017.3 Field installed accessories .6117.4 Assembly test .6317.5 MDCs not fully configured .6318 Performance .6418.1 General .6418.2 Temperature test .6418.3 Dielectric voltage-withst
13、and test 6418.4 Transport and handling vertical impact test 6519 Markings .6619.1 General .6619.2 ITE and other load equipment electrical rating marking .6719.3 Field wiring terminal markings .6819.4 Panelboard and switchboard markings 6820 Instructions 68APPENDIX A (Normative)Standards for Componen
14、tsA1JULY 18, 2018UL 27554UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1 Scope1.1 This Outline of Investigation covers Modular Data Centers (MDC). The Modular Data Centers coveredby these requirements are pre-fabricated units consisting of a
15、n outer enclosure housing ITE and varioussupport 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 typicalconstruction may use a standard ISO shipping container or other stru
16、cture as the outer enclosure, racksor cabinets of ITE, NEC compliant service entrance equipment and power distribution components, powerstorage such as a UPS and an air or liquid cooling system.1.2 These factory-built modules incorporate pre-installed materials and equipment which, afterinstallation
17、, 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 eitherindoors or outdoors based on their construction and resistance to environmental conditions. MDCsintended for
18、 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. Wherestate or local codes differ
19、from the national codes anticipated by these requirements, determiningcompliance 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 applicablerequirements of the National Codes
20、shall be used.1.6 This Outline of Investigation assumes that the final installation of the MDC will be performed byqualified service personnel in accordance with the applicable installation instructions, installation practicesand national installation codes. These MDCs are intended for installation
21、subject to approval by theAuthority Having Jurisdiction.2 Equipment, Sub-Assemblies and Components2.1 Except as indicated in 2.2, equipment, subassemblies and components used as a part of an MDCcovered by this Outline of Investigation shall comply with the requirements for that equipment,subassembly
22、 or component. See Appendix A for a list of standards covering equipment, subassembliesand components.2.2 Equipment, subassemblies and components are not required to comply with a specific requirementthat:a) Involves a feature or characteristic not required in the application of the component in the
23、product covered by this Outline of Investigation; orb) Is superseded by a requirement in this Outline of Investigation.2.3 Equipment, subassemblies and components shall be used in accordance with their ratings and anyinstallation requirements established for the intended conditions of use.JULY 18, 2
24、018 UL 2755 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.4 Equipment, subassemblies and components that are incomplete in construction features or restrictedin performance capabilities shall be used only under the specific conditions for
25、 which they have beenevaluated.3 Units of Measurement3.1 Where a value for measurement is followed by a value in other units in parentheses, the first statedvalue is the requirement.4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this Outline ofIn
26、vestigation shall be interpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purposes of this Outline of Investigation the following definitions apply.5.2 APPLIANCE A piece of utilization equipment that incorporates both controls and loads.5.3 BRANCH CIRCUIT The
27、 conductors and components following the last overcurrent protectivedevice protecting a load.5.4 BRANCH CIRCUIT PROTECTION Overcurrent protection with an ampere rating selected toprotect the branch circuit. For a motor branch circuit, the overcurrent protection is required forovercurrents due to sho
28、rt circuits and faults to ground only.5.5 BRANCH CIRCUIT PROTECTIVE DEVICE A fuse or circuit breaker that has been evaluated toa safety standard for providing overcurrent protection.5.6 CLASS 1 CIRCUIT A control circuit on the load side of overcurrent protective device where thevoltage does not exce
29、ed 600 volts, and where the power available is not limited, or control circuit on theload side of power limiting supply, such as a transformer.5.7 CLASS 1 WIRING Conductors of a Class 1 Circuit.5.8 CLASS 2 CIRCUIT A control circuit supplied from a source having limited voltage (30 Vrms orless) and c
30、urrent capacity, such as from the secondary of a Class 2 transformer, and rated for use withClass 2 remote-control or signaling circuits.5.9 CLASS 2 WIRING Conductors of a Class 2 circuit.5.10 CONTROL CIRCUIT A circuit that carries the electric signals directing the performance of acontroller, and w
31、hich does not carry the main power circuit. A control circuit is, in most cases, limited to15 amperes.5.11 CONTROL TRANSFORMER A transformer whose secondary supplies power to control circuitdevices only (excluding loads).5.12 CONTROLLER A device or group of devices that serves to govern, in some pre
32、determinedmanner, the electric power delivered to the apparatus to which it is connected.5.13 COVER An unhinged portion of an enclosure that covers an opening.JULY 18, 2018UL 27556UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.14 DISCONNECT
33、 SWITCH A device that disconnects all ungrounded conductors of a circuit fromtheir electrical supply.5.15 DOOR A hinged portion of an enclosure that covers an opening.5.16 EQUIPMENT A general term, including fittings, devices, appliances, luminaires, apparatus,machinery, and the like used as a part
34、of, or in connection with, a modular data center.5.17 EXIT ACCESS Means that portion of an exit route that leads to an exit.5.18 EXIT ROUTE Means a continuous and unobstructed path of exit travel from any point within aworkplace to a place of safety (including refuge areas). An exit route consists o
35、f three parts: The exitaccess; the exit; and, the exit discharge. (An exit route includes all vertical and horizontal areas alongthe route.)5.19 FEEDER CIRCUIT The conductors and circuitry on the supply side of the branch circuitovercurrent protective device.5.20 FIELD WIRING Conductors to be instal
36、led by others to connect the equipment to source(s) ofsupply, remote control devices, and loads.5.21 FIELD WIRING TERMINAL A terminal provided to terminate field wiring.5.22 FUSE, BRANCH CIRCUIT TYPE A fuse of Class CC, G, H, J, K, L, R, and T. These fuses areable to provide branch circuit protectio
37、n.5.23 FUSE, SUPPLEMENTARY TYPE Miscellaneous type and miniature type fuses. These fusesare able to provide supplementary protection only.5.24 GENERAL-USE RATING A rating, expressed in volts and amperes, assigned to a device that isintended to control:a) A load with a continuous or inrush ampere rat
38、ing not exceeding the ampere rating of thedevice;b) When ac rated, a load that has a power factor of 0.75 to 0.80 (inductive); andc) When dc rated, a load that is resistive (non-inductive).5.25 INSTANTANEOUS TRIP CIRCUIT BREAKER A circuit breaker in which no delay is introducedinto the tripping acti
39、on of the circuit breaker. These circuit breakers are able to provide branch circuitprotection.5.26 INVERSE-TIME CIRCUIT BREAKER A circuit breaker in which a delay is introduced into thetripping action of the circuit breaker. The delay decreases as the magnitude of the current increases.These circui
40、t breakers are able to provide branch circuit protection.5.27 ISOLATED SECONDARY CIRCUIT A circuit derived from an isolating source (such as atransformer, optical isolator, limiting impedance, or electro-mechanical relay) and having no directconnection back to the primary circuit (other than through
41、 the grounding means). A secondary circuitthat has a direct connection back to the primary circuit is evaluated as part of the primary circuit.JULY 18, 2018 UL 2755 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.28 LOW-VOLTAGE LIMITED ENER
42、GY CIRCUIT A control circuit involving a peak open-circuitpotential of not more than 42.4 volts (dc or peak) supplied by a primary battery or by an isolatedsecondary circuit, and where the current capacity is limited by an overcurrent device, such as a fuse, orby the inherent capacity of the seconda
43、ry transformer or power supply, or a combination of a secondarywinding and an impedance. A circuit derived from a line-voltage circuit by connecting a resistance inseries with the supply circuit to limit the voltage and current is not identified as a low-voltage limitedenergy circuit.5.29 OVERCURREN
44、T PROTECTION A device designed to open a circuit when the current throughit exceeds a predetermined value. The ampere rating of the device is selected for a circuit to terminatea condition where the current exceeds the rating of conductors and equipment due to overloads, shortcircuits and faults to
45、ground.5.30 OVERLOAD PROTECTION Protection required for motor circuits that will operate to prohibitexcessive heating due to running overloads and failure to start.5.31 POWER CIRCUIT Conductors and components of branch and feeder circuits.5.32 POWER TRANSFORMER A transformer whose secondary winding
46、supplies power to loads ora combination of loads and control circuit devices operating at the secondary voltage.5.33 SHORT CIRCUIT CURRENT RATING The prospective symmetrical fault current at a nominalvoltage to which an apparatus or system is able to be connected without sustaining damage exceedingt
47、he defined acceptance criteria.5.34 SUPPLEMENTARY PROTECTION A device intended to provide additional protectionsubsequent to branch circuit protection. They have not been evaluated for providing branch circuitprotection.5.35 SUPPLEMENTARY PROTECTOR A manually resettable device designed to open the c
48、ircuitautomatically on a predetermined value of time versus current or voltage within an appliance or otherelectrical equipment. It is also able to be provided with manual means for opening or closing the circuit.These devices are able to provide supplementary protection only.5.36 WIRE BENDING SPACE
49、 The amount of space required between a field wiring terminal and anenclosure wall directly opposite the terminal, to provide enough space for field wiring conductors.JULY 18, 2018UL 27558UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6 Electrical6.1 General6.1.1 Electrical circuits that are an integral part of the MDC including lighting, control, power, HVAC(heating, ventilation and air-conditioning), emergency lighting, alarm circuits, and the like
