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.