area vs I
area vs I
(OP)
Suppose a wire is carrying 3 phase ac current, as you increase the current, by what magnitude must the cross sectional area increase by?
Is this a linear relationship?
Thanks.
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RE: area vs I
Glenn
RE: area vs I
RE: area vs I
This value depends upon many factors as ambient temperature, ambient material -exposed to free air or concealed in conduits, buried in a certain depth in a certain ground and so on.
If two cables are in the same conditions- for small cross section of conductors- the required cross section will grow[lesser a bit] with the square of current ratio.
For instance, if for 1.5 sqr.mm permissible may be 24 A for 2.5 sqr.mm will be only 32A (32/24)^2*1.5= 2.67 sqr.mm
For instance, if for 2.5 sqr.mm permissible may be 32 A for 4 sqr.mm will be only 42A (42/32)^2*2.5= 4.3 sqr.mm