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64 WIRE LENGTH
When long wires are used, resistance in each wire increases while voltage drop occurs.
Consequently, the input voltage to an electric appliance declines, often damaging the appliance.
The table below shows that the voltage decreases in 100 m wire with different cross sectional
areas and varied resistances.
Cross
sectional
araa
No. of 1
Alloweble j
COIldUCtO~/
current conductor i
Rasistanca
diameter !
Current
I
mm2 j A j No./mm
a/lOOm 1 1A 3A 5A 8A ! 10A i 12A 1
15A
I
’
0.75 * 7 : 3010.18 2.477 2.5V 8V 12.5V _
I
-/- ] - j
.
I
1.25 : 12 : 5010.18 ! 1.466 1.w ! 5v i 7.5V 12v 15v 18V -
i 17
I I
I
b
2.0 37/0.26
,
0.952 1v ,3v 1 5V ! 8V 1ov
i
12v 15v d
0
z
3.5 23 4510.32
’
0.517
’
- j 1.5V 2.5V 1 4V ’ 5V 6% 7.5v 5
>
5.5 35 7010.32 0.332 - 3.5v 4v
-17-