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A.1.1.4.1
Optional standby systems are described in National Electrical Code, NFPA 70 Article 702.Article 702 of NFPA 70, National Electrical Code. Formatted: Font: Italic
Table 4.2.2 T* Types of SEPSS Type Interruption Time Type O No interruptions — UPS carrying load, 0 sec
Type U UPS system with utility as preferred source
Type A 0.25 cycle: 0.0042 sec
Type B 1.0 cycle: 0.0167 sec
Type 10 10 sec
Type M Manual stationary or nonautomatic — no time limit
Comment [b1]: SL: Tables are not permitted to have Annex A material.
Table 5.3.1 Instrumentation Display Indicator
Level Device 1 2
Battery voltage X X System output voltage, each leg X X System output current, each leg X X System output frequency (ac output systems only) X X Internal battery temperature (battery systems only) X X
Table 5.3.1 Instrumentation Display Indicator
Level Device 1 2
Battery voltage X X System output voltage, each leg X X System output current, each leg X X System output frequency (ac output systems only) X X Internal battery temperature (battery systems only) X X X = Required.
*A.7.3.3.1
Battery rooms frequently house vented lead-acid (VLA) or nickel-cadmium (Ni-Cd) batteries
that evaporate electrolyte gas into the battery space, thereby requiring periodic water
replenishment. Valve rRegulated lLead-aAcid (VRLA) batteries, by contrast, vent almost
immeasurable amounts of flammable gas under normal conditions, but they can also vent
significant amounts of gas under certain failure modes such as thermal runaway. Battery
manufacturers can provide guidance on the rate of gassing. All batteries require some amount
of ventilation.
Comment [b1]: SL: Standardize treatment? Ni-Cd or NiCd?
Comment [b2]: SL: Replace with ‘minuscule’? ‘Immeasurable’ suggests an amount so large or extensive it can’t be measured.
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