UL 1778:5ED 2014-06-13
Current
The latest, up-to-date edition.
Uninterruptible Power Systems
Hardcopy
English
13-06-2014
Preface
1 General
2 Protection from hazards
3 Wiring, connections, and supply
4 Physical requirements
5 Electrical requirements and simulated abnormal conditions
6 Connection to telecommunication networks
7 Connection to cable distribution systems
Annexes
Annex AAA (normative) - Additional component requirements
Annex BBB (informative) - Examples of NORMAL LOAD conditions
Annex CCC (informative) - Safety symbols and their meanings
Annex DDD (normative) - Harmonic distortion test
Annex EEE (normative) - Earthing and bonding
Annex FFF (normative) - BACKFEED PROTECTION test
Annex GGG (informative) - Principles of BACKFEED PROTECTION
Annex HHH (normative) - Ventilation of battery compartments
Annex III (normative) - Standards for components
Annex JJJ (normative) - French translations and markings
Annex LLL (informative) - Examples of US and Canadian
regulatory requirements
Annex MMM (normative) - Test and construction requirements
for UPS with fault current ratings higher than those
specified in Table NNN.5
Annex NNN (normative) - Short-circuit withstand rating
Annex OOO
Annex PPP (normative) - Manufacturing and production tests
This revision of ANSI/UL 1778 is being issued to include the following changes: Addition of dated reference to UL 60950 RD Update to references to the component requirements of the RD Update to Table 4.5.3.101A for temperature limits Revision to bus bar temperature limits Addition of symbol for no telecommunication network Corrections in Annex NNN for short-circuit withstand rating Addition of requirements and figure for short circuit withstand and short circuit closing test port location Updates to References
| DevelopmentNote |
Also numbered as CSA C22.2.107.3. (04/2003)
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| DocumentType |
Standard
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| Pages |
0
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| PublisherName |
Underwriters Laboratories
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| Status |
Current
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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.
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