WHAT IS THE THUMBRULE FOR FINDING OUT THE CURRENT CAPICITY
OF A COPPER WIRE?? 2.5, 4, 6MM SQUARE ETC...
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Answer Posted / amro
depend the weathier out side the cabel
1- temperature
2- length of the cable
3-load factor
4- the cabel throw ( in air &duct & pipe &cabel tranch&
cabel leader inside the tranch)
for exampel:-
i= power/ volt* cos@
after that let used cabel 4 mm2
look in the catlog cabel and taking the rated current
oppset the wire
rated current *load factor*factor group*factor throw (in
air &duct & pipe &cabel tranch& cabel leader inside the
tranch )*factor temprature =current
1- if more then the load current ites ok
2- if less then the load current ites no must be chose the
big size cabel and again
calculate the equation and so an
after the calculate the voltge droop presentage must be
less the _+ 5 % from the main voltge
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