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Do-It-Yourself (DIY) Question & Answer Forum
Working Out Amps For A 3-Phase Machine
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<blockquote data-quote="apprentice87" data-source="post: 332830" data-attributes="member: 13534"><p>Dear me......</p><p></p><p>If the load is given as kVa then power factor has already been accounted for... If it was a purely resistive load, such as a heater, then it would have been given as 37kW....</p><p></p><p>Anyway, to go back to the original question; The relationship between No1 and 3 is fairly obvious, think about it....</p><p></p><p>So, power is 400 x current x 1.732 = well, power in kVa so swap things round a bit and we have 37000 divided by 400 = 92.5 divided by 1.732 = 53.404 Amps per phase.</p><p></p><p>If you know it is a balanced load you could do it the other way, that is 37000 divided 3 = 12333.3333 divided by 230 = 53.623 Amps per phase</p><p></p><p>So, there we are 53 amps....</p><p></p><p>john</p><p></p><p>Two further points,</p><p></p><p>1, Anyone that wants to take on Sidewinder or Steps in a debate on electrical matters is going to lose big style.</p><p></p><p>2, If you need to use an online calculator to work out that sort of thing you should not be playing around with electrical installations in the first place......</p><p></p><p>john.....</p></blockquote><p></p>
[QUOTE="apprentice87, post: 332830, member: 13534"] Dear me...... If the load is given as kVa then power factor has already been accounted for... If it was a purely resistive load, such as a heater, then it would have been given as 37kW.... Anyway, to go back to the original question; The relationship between No1 and 3 is fairly obvious, think about it.... So, power is 400 x current x 1.732 = well, power in kVa so swap things round a bit and we have 37000 divided by 400 = 92.5 divided by 1.732 = 53.404 Amps per phase. If you know it is a balanced load you could do it the other way, that is 37000 divided 3 = 12333.3333 divided by 230 = 53.623 Amps per phase So, there we are 53 amps.... john Two further points, 1, Anyone that wants to take on Sidewinder or Steps in a debate on electrical matters is going to lose big style. 2, If you need to use an online calculator to work out that sort of thing you should not be playing around with electrical installations in the first place...... john..... [/QUOTE]
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Working Out Amps For A 3-Phase Machine
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