UL 1778-2017 pdf download
UL 1778-2017 pdf download.Uninterruptible Power Systems.
4.3.8101.2 General requirements for installation
4,3.8.1012.1 Accessibility and maintainability
Battery poles (terminals) and battery connectors shall be accessible so that their fixings (hardware) can be tightened with the correct Too.s. Batteries with liquid electrolyte shall be so located that the battery cell (vent) caps are accessible for electrolyte tests and readiusting of electrolyte levels.
Compliance is checked by inspection and application of the rccs and measunng equipment sLipplied or recommended by the battery manufacturer.
4.3.8.101.2.2 Insulation
Batteries in conductive casings shall be provided with adequate Insulation between each other and from cabmets or compartments. Such insulation shall meet the requirements of 2.9/RD.
Compliance is checked by measurement and/cr test.
4.3.8.101.2.3 Electrolyte spillage
VEMW BATTERY trays and cabinets shall have an electrolyte-resistive coating.
The ciosu or compartment housing a vtwiti *rrv shall be constructed so that spillage or leakage of the electrolyte from one battery will be contained within the tictosus and be prevented from
a) reaching the outer surfaces of the UPS, where contact witti the usrn Is possible;
b) contaminating adjacent electrical components or materials; and C) bridging required electrical distances.
Compliance as checked by inspection.
4.3.8.101.2.4 Ventilation
The ENC1.OSURE or compartment housing a VENTED BATTERY shall be provided with proper ventilation so that any potentially explosive mixtures of hydrogen and oxygen are dispersed safety below non-hazardous levels.
For battery compartments (separate or combined), the method for determining the necessary airflow to ensure adequate dissolution levels is given in Annex HHH.
In combined apparatus of battery and electrical components, attention shall be given to prevent ignition of local concentrations of hydrogen and oxygen by adjacent operational arcing parts, such as contactors and switches close to battery vents/valves. This shall be achieved by the use of fully enclosed components, separation of battery compartments, or adequate ventilation, depending on the technical construction of the UPS and battery.
For battery rooms, proper information on the required flow of air shall be provided in the installation instructions if the battery installation is supplied with the UPS.
5.2 Electric strength
Additional subcia use:
5.2.101 Electric strength test
The terminals of across-the-line capacitors shall withstand without breakdown 1000 volts plus twice rated a.c. voltage, or d.c. equivalent, applied for 1 mm. Only capacitors not Investigated to the standards listed in Annex Ill are subject to this test.
An additional pulse current test is under consideration.
5.3 Abnormal operating and fault conditions
5.3.101 Forced ventilation test
5,3.101,1 A UPS having forced ventilation shall be operated in all modes with the rotor 01 a blower motor or fan locked. For a UPS having more than one blower motor or fan, the test shall be conducted with the rotor of each blower motor or fan locked, either one at a time or simultaneously.
5.3.101.2 A ui’s having filters over ventilation openings shall be operated with the openings blocked to represent clogged filters. The test shalt be conducted initially with the ventilation openings blocked approximately 50%, and then shall be repeated under fully blocked condition. A single blower or fan with a filter need not be tested under the fully blocked condition.
5.3.101.3 The ventilating means for an ENcLOSURE or a compartment housing a battery shall comply with the requirements in HHH.2, HHH.4, and HHH.5 under blocked blower or fan and clogged fitter conditions described in 5.3.101.1 and 5.3.101.2.
5.3.102 Overcharge test
A battery supply that is to be evaluated with the UPS shall be subiected to 7 h of overcharging, connected to a supply circuit adjusted to 106% of nominal voltage, using a fully charged battery. Any oi’smwonadjustable controls associated with the charger or charging circuit shall be adjusted for the most severe charging rate.
