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A house has 4 kW connected loads and is fed by single phase supply. What range energy meter is recommended for the house?

A house has 4 kW connected loads and is fed by single phase supply. What range energy meter is recommended for the house? Correct Answer 30 A

Concept:

Note that in India standard single phase supply voltage is 230 V & domestic power factor ranges from 0.6 to 0.9

Active power in kW can be calculated as

P = VI cosϕ x 10-3

Where, 

V = Voltage

I = Current

cosϕ = Power factor

Application:

For a 4 kW single phase load, range of energy meter can be calculated as

4 = 230 x I x 0.6 x 10-3

I = 28.98 A ≈ 30 A

So that for a 4 kW single phase load 30 A range energy meter is recommended.

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