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55v - 110v centre tap transformer short circuit calculations

Anthony Sullivan

hello

i have been trying to work out how to work short circuit calculations for 110v systems. do i use 55V with c max or do use 110v or even use a 3phase calculation. i am trying to work out if a circuit will trip on 16A c type mcb for short circuit as i am putting a rcbo in to cover the fault current. 

110v 55v 

0.85ohms line to line tested

4mm 2 core cable 

 

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    Andy "3-phase RLV system would be 63V L-PE and 110V L-L " why was I thinking 63.5V?

    Yes, my number was just an approximation!  In my defence it's less inaccurate than the usual 230/400V notation (230V * √3 = nearer 398V than 400V).

       - Andy.

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  • 0

    Andy "3-phase RLV system would be 63V L-PE and 110V L-L " why was I thinking 63.5V?

    Yes, my number was just an approximation!  In my defence it's less inaccurate than the usual 230/400V notation (230V * √3 = nearer 398V than 400V).

       - Andy.

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