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TECH TIPS
OHMS LAW SIMPLIFIED
IR
E
voltage
watt
s
amperage
curren
t
resistance
R
I W
E
I
E
2
W
W
I
2
E
2
R
I
2
R
W
E
E
R
WR
W
I
W/R EI
POWER CABLE CALCULATOR
TOTAL AMPERAGE
0-4 FT 4-7 FT 7-10 FT 10 -13 FT 13-16 FT 16-19 FT 19-22 FT 22-28 FT
0 – 20 14 12 12 10 10 8 8 8
20 – 35 12 10 8 8 6 6 6 4
35 – 50 10 8 8 6 4 4 4 4
50 – 65 8 8 6 4 4 4 4 2
65 – 85 6 6 4 4 2 2 2 0
85 – 105 6 6 4 2 2 2 2 0
105 – 125 4 4 4 2 0 0 0 0
125 – 150 2 2 2 0 0 0 0 0
The above chart shows cable gauges to be used, if no less than a 0.5 volt drop is acceptable. If aluminium
wire or tinned wired is used, the gauges should be of an even larger size to compensate. Cable gauge size
calculation takes into account terminal connection resistance.