Source: https://standardscatalog.ul.com/standards/en/standard_1778_2
Timestamp: 2018-12-12 22:55:49
Document Index: 594633417

Matched Legal Cases: ['art 1', 'ART 1', 'arts\n20', 'arts\n21', 'arts\n66', 'ART 2', 'ART 3']

UL - 1778 Standard for Uninterruptible Power Supply Equipment | Standards Catalog
Standard for Uninterruptible Power Supply Equipment
1.1 These requirements cover uninterruptible power supplies (UPS) rated 600 volts or less ac or dc that are intended for installation in accordance with the National Electrical Code , NFPA 70 . During normal operation, the UPS allows the primary or normal power source to deliver ac power to the protected load through either the power conversion portion of the UPS or a bypass source. The power conversion portion of the UPS consists of a rectifier, an inverter, or both. During periods of power fluctuations, or power outages, or both, the connected load receives ac power from the battery supply and power conversion portion of the UPS.
1.2 Products that are used with UPS and that are covered by this standard include:
a) Remote battery supply cabinets with or without batteries;
b) Remote status panels;
c) Bypass switches;
d) Maintenance bypass switches;
e) Rectifier, power conversion units, or both; and
f) Power distribution panels.
1.3 A battery supply (see 2.4 ) used with a UPS covered by this standard may consist of any of the following described in (a) – (c):
a) A battery supply that is integral with the UPS. The batteries may or may not be furnished with the UPS.
b) A battery supply that is contained in a remote cabinet. For a cord-and-plug-connected UPS having an ac input rating of 20 amperes or less and 125 volts ac maximum, the battery supply is furnished with the UPS. For all other UPS intended for use with a remote battery and cabinet assembly, the battery supply may or may not be furnished with the UPS.
c) A battery supply that is contained in a separate battery room. This type of battery supply may or may not be furnished with the UPS.
1.4 These requirements cover static type UPS– not rotary type UPS.
1.5 This standard does not cover Uninterruptible Power Supplies (UPS) intended for use in health care facilities. UPS intended for use in such facilities shall comply with the requirements of this standard and the Standard for Safety of Medical Electrical Equipment, Part 1: General Requirements, UL 60601-1. UPS that employ hospital grade components identified by the markings "Hospital Only", "Hospital Grade", or a green dot on the body of the component, or otherwise implying suitability for medical use shall be evaluated to these standards.
1.5 revised effective May 27, 2005
1.6 These requirements cover UPS equipment that may be installed in accordance with the Standard for Protection of Electronic Computer/Data-Processing Equipment , ANSI/NFPA 75 . This equipment is marked indicating that it is suitable for such use. See 72.1.27 .
1.7 Engine-driven, dc power generators intended to provide backup power for the battery supply circuit of UPS units are investigated for compliance with the requirements in the Standard for Engine-Generator Assemblies for Use in Recreational Vehicles, UL 1248.
1.8 These requirements do not cover UPS units for use as emergency systems nor legally required standby systems described in Articles 700 and 701 respectively of the National Electrical Code , ANSI/NFPA 70 .
1.9 Deleted May 27, 2004
1.10 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard.
1.10 added May 27, 2004
PART 1 &ndash; ALL UPS EQUIPMENT
5.2 Modular units
5.3 Access covers
5.4 Cast metal enclosures
5.5 Sheet metal enclosures
5.6 Nonmetallic enclosures
5.7 Glass covered openings
5.8 Openings for wiring
5.9 Openings in an enclosure
5.10 Enclosure bottom openings
5.11 Enclosure top openings
5.12 Guards
7 Protection of Users &ndash; Accessibility of Uninsulated Live Parts, Film-Coated Wire, and Moving Parts &ndash; and User Servicing
8.1 Voltage
8.2 Stored energy
13 Disconnection Device
15 Supply Connections
15.1 Fixed units
15.2 Openings for conduit or cable connection
15.3 Openings for class 2 circuit conductors
15.4 Cord-connected units
15.5 Strain relief
15.6 Bushings
15.7 Interconnections between sections
15.8 Identification
16 Wire Bending Space
17 Output Circuit Grounding
19 Bonding of Internal Parts
20.1 Wires
21 Current-Carrying Parts
21.2 Bus bars
21.3 Live heat sinks
23.2 Insulation barriers
25 Accessible Signal Circuits
26.2 Coil insulation
27 Separation of Circuits
27.1 Factory wiring
27.2 Separation barriers
27.3 Field wiring
28 Overcurrent Protection
28.2 Control circuits
28.3 Output alternating current power circuits
28.4 Battery supply circuits
28.5 Inverter storage capacitors
29 Backfeed Protection
34 Printed-Wiring Boards
35 Insulating Materials
36 Flammability Classification of Internal Materials
36.2 Air filters
37 Adhesives
38 Battery Supplies
38.2 Enclosure
38.3 Battery mounting
38.4 Enclosure ventilation
38.5 Batteries
38.6 Overcurrent protection
38.7 Isolation
39 Protection of Service Personnel
40 Harmonic Distortion
44 Power Input Test
46 Load Temperature Test
47.2 Maximum-voltage measurements
47.3 AC and DC power circuits
47.4 Secondary circuits
47.5 Induced potential
48 Backfeed Protection Test
48.2 Electromagnetic interference filters
50 Volt-Ampere Capacity Measurement
51 Neutral to Ground Potential Measurement Test
52 Abnormal Tests
52.2 Transformer burnout test
52.3 Transformer overload test
52.4 Output overload test
52.5 Short circuit test
52.6 Overcharge test
52.7 Capacitor surge current test
52.8 Capacitor fault test
52.9 Forced ventilation test
52.10 Component short- and open-circuit test
52.11 Electrolytic capacitor fault test
52.12 Load transfer
52.13 Mismatch voltage test
53 Flanged Bobbin Transformer Abnormal Test
54 Strain Relief and Flexing Tests
54.1 Strain relief
54.2 Flexing
54.3 Push-back relief
55 Grounding Impedance Test
56 Overcurrent Protection Calibration Test
57 Battery Compartment Ventilation Test
58 Strength of Terminal Insulating Base and Support Test
59 Strength of Handles Test
60 Mechanical Strength Tests for Metal Enclosures
61 Evaluation of Reduced Spacings on Printed-Wiring Boards
61.2 Dielectric voltage-withstand test
61.3 Shorted trace test
64 Impact on Glass Covered Openings
65 Impact Test &ndash; Guards Over Moving Parts
66 Heat Sink Temperature Cycling Test
67 Tests for Permanence of Cord Tag
67.2 Test conditions
68 Ignition Test Through Bottom-Panel Openings
68.2 Hot, flaming oil test
69 Tests on Transformer Insulating Materials
70 Bus Bar Tests
70A Maximum Output VA Measurement Test
70B Emergency DC Power Off Test
72.2 Cautionary markings
73 Instruction Manual
74 Important Safety Instructions
74.2 Batteries
74.3 Vented batteries
75 Installation Instructions for Cable TV Uninterruptible Power Supplies
76 Production-Line Dielectric Voltage-Withstand Test
77 Production-Line Grounding-Continuity Test
PART 2 &ndash; OUTDOOR-USE UNITS
79 Enclosure and Corrosion Protection
80 Rain Test
81 Accelerated Aging Test
82 Metallic Coating Thickness
83 Details
PART 3 &ndash; ACCESSORY EQUIPMENT AND CONVERSION UNITS
86 Installation Test
1778 - 5 ulcsa