It also helps to determine whether to offer a three phase or single pPase UPS system. This not only builds up a complete picture of the electrical circuits on-site. Even when the consumer has a three phase connection, the choice of three phase or single phase UPS depends on several factors like the loads to be connected to UPS and also electrical distribution within the facility from the building incomer, electrical switchgear and distribution units to the room the loads to be protected are within. Only if expected load is below 5-7KW, then the consumer gets a single Phase connection. Most consumers of electricity in India have a three phase mains connection if the total load is more than 5-7 KW. Each phase reaches its peak 120 degrees apart from the others so the level of power supplied remains consistent Single Phase power is used in most homes and small businesses and adequate for running lights, fans, 1 or 2 ACs, some computers and motors up to about 5 horsepower a single phase motor draws significantly more current than the equivalent 3-Phase motor, making 3-Phase power a more efficient choice for industrial applicationsįigure-2 3-Phase power has 3 distinct wave cycles that overlap. All of these factors play into the sizing of the UPS and the selection of the type of the UPS Selection of UPS 3 Phase or 1 Phase It is important to determine the acceptable delay between loss of primary power and availability of UPS power, the length of time that emergency or backup power is required, and the criticality of the load that the UPS must bear. Some facilities need an UPS for more than one purpose. UPS may be needed for a variety of purposes such as lighting, startup power, transportation, mechanical utility systems, heating, refrigeration, production, fire protection, space conditioning, data processing, communication, life support, or signal circuits. Prior to selecting the UPS, it is necessary to determine the need.

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