UL 1778:2011 free download

UL 1778:2011 free download Uninterruptible Power Systems
1 General
This clause of the RD applies as applicable, except as follows:
1.1 Scope
Replace this clause of the RD with the following:
1.1.1 Equipment covered by this standard
This Standard applies to UNNTERRUPTIBLE POWER SYSTEMS (uPs). The primary function of the ups for thisStandard is to ensure continuity of an alternating power source. The UNINTERRUPTIBLE POWER SYSTEM may alsoserve to improve the quality of the power source by keeping it within specified characteristics. ThisStandard is applicable to movable, stationary, fixed, and built-in ups for distribution systems up to 600 va.c.This equipment is designed to be installed in accordance with the Canadian Electrical Code, Part l,CSA C22.1，or the National Electrical Code，ANSI/NFPA 70，and，unless otherwise identified,theStandard for the Protection of Electronic Computer Data-Processing Equipment,ANSI/NFPA 75.
This Standard specifies requirements intended to ensure safety for the oPERAToR and,where specificallystated, for sERVICE PERSONNEL.
This Standard is intended to reduce the risk of fire,electric shock, or injury to persons from installedequipment, both as a single unit or as a system of interconnected units, subject to installing, operating,and maintaining the equipment in the manner prescribed by the manufacturer.
1.1.2 Additional requirements
In addition to the requirements in this Standard, a uPs is to comply with the uPs-relevant requirements ofInformation Technology Equipment Safety -Part 1:General Requirements, CAN/CSA-C22.2 No.60950-1/ UL 60950-1, first edition, (RD), as applicable for the country where the product will be used. Whereverthere is a conflict between the requirements of this document and the RD, the requirements of thisStandard will prevail.
Engine-driven d.c. power generators intended to provide backup power for the battery supply circuit of uPsunits are investigated for compliance with the requirements of the Standard for StationaryEngine-Generator Assemblies, UL 2200,and the CSA Standard for Motors and Generators,C22.2 N.100.
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 areevaluated to the requirements of this Standard and Medical Electrical Equipment，Part 1: GeneralRequirements for Safety,CAN/CSA-C22.2 No.601.1/ UL 60601-1.
1 .1 .3 Exclusions These requirements do not cover UPS units for use as emergency systems or as legally required standby systems, described in Articles 700 and 701 , respectively, of the National Electrical Code, ANSI/NFPA 70, and Section 46 of the Canadian Electrical Code, Part I, CSA C22.1 .
Where considered appropriate, revision of requirements will be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.