L lyncher366 Oct 23, 2012 #1 how do i get size of MCB of a 3 phase 1Kw gas heater. does it have to go through an RCD, help please its for an exam iam doing,thanks
how do i get size of MCB of a 3 phase 1Kw gas heater. does it have to go through an RCD, help please its for an exam iam doing,thanks
i=p/u - Arms Oct 23, 2012 #2 for a three phase circuit, Current (3 phases): I = P / √3 Vl×cos φ or I = P / 3 Vp×cos φ P = power (watts), I = current (amperes), Vl = line voltage (volts), Vp = phase voltage (volts), φ = power factor angle between voltage and amperage Translated: Current = Watts / √3 Line Voltage × cos Power Factor Angle Or Current = Watts / 3 Phase Voltage × cos Power Factor Angle
for a three phase circuit, Current (3 phases): I = P / √3 Vl×cos φ or I = P / 3 Vp×cos φ P = power (watts), I = current (amperes), Vl = line voltage (volts), Vp = phase voltage (volts), φ = power factor angle between voltage and amperage Translated: Current = Watts / √3 Line Voltage × cos Power Factor Angle Or Current = Watts / 3 Phase Voltage × cos Power Factor Angle
L lyncher366 Oct 23, 2012 #3 good man thanks for replying. I=1000/692.82 I=1.44amps so i can use 1.5mmsq cable and a 10amp MCB is that right.
good man thanks for replying. I=1000/692.82 I=1.44amps so i can use 1.5mmsq cable and a 10amp MCB is that right.