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0ld1e
Hi everyone.
I'm after abit of help calculating cables sizes and protective devices for a 3 phase DOL motor.
I haven't worked on 3 phase equipment for many years and 3 phase calculations is as far back as college so please excuse my ignorance on the subject and not knowing answers to perhaps basic questions.
Lets say for example we have a 3 phase 400v supply going to an induction motor. 5kw and a power factor of 0.8 and its on traywork.
would I be right in thinking the following.
5000/ (400* root3 * 0.8) = 9.02Amps per phase. 16.63A total ?????
table 4D4A BS7671 reference method E says 1.5mm 19Amps.
Sorry for this question but is the 19Amps the total the cable can carry overall or the total per phase?
How do I select the correct cable and 3 pole mcb from here?
I know there are other factor that come into play but can somebody please take me through the basic steps first so I can see how we get from start to finish then I would be happy to look at what other factor we need to consider.
Many thanks.
I'm after abit of help calculating cables sizes and protective devices for a 3 phase DOL motor.
I haven't worked on 3 phase equipment for many years and 3 phase calculations is as far back as college so please excuse my ignorance on the subject and not knowing answers to perhaps basic questions.
Lets say for example we have a 3 phase 400v supply going to an induction motor. 5kw and a power factor of 0.8 and its on traywork.
would I be right in thinking the following.
5000/ (400* root3 * 0.8) = 9.02Amps per phase. 16.63A total ?????
table 4D4A BS7671 reference method E says 1.5mm 19Amps.
Sorry for this question but is the 19Amps the total the cable can carry overall or the total per phase?
How do I select the correct cable and 3 pole mcb from here?
I know there are other factor that come into play but can somebody please take me through the basic steps first so I can see how we get from start to finish then I would be happy to look at what other factor we need to consider.
Many thanks.
