How do I determine the cable size?

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8 Feb 2012
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Antrim
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United Kingdom
I have been asked to wire a chiller on a roof, it's 415v has a start up current of 505amp, run current of 425amp, the distance is 70mtrs! How do I determine the correct cable size for this run of armoured cable?
 
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425A? What, are you planning to start another ice age?

Are the people who asked you to wire it aware that you lack basic electrical knowledge?
 
How do I determine the correct cable size for this run of armoured cable?

Since this sounds like a place of work The Electricity at Work Regulations:1989 will be in force which means it is illegal for you to be carrying out this work if you don't know what you are doing !

For your sake and the safety of the occupants get a professional !
 
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How do I determine the correct cable size for this run of armoured cable?
By using the knowledge and skills you acquired during your training, success at which you demonstrated when passing the exams which led you and others to believe that you are competent to work as an electrician.
 

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