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Answer Posted / govind bisht
The capacity of UPS.It means the UPS can handle full load
upto 600VA i.e not a real power(KW). real power also
depends on power factor of UPS.suppose Pf of UPS is .8 the
real power UPS can deliever i.e 600*.8=480W
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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
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