Wire Sizes And Maximum Length Determination Chart Page 2
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11Wire Sizes and Maximum Length Determination
(7/5/2007)
well pumps. They exhibit very high surge demands when starting. Significant voltage
drop in these circuits may cause failure to start and possible motor damage. Follow the
National Electrical Code. In the case of a well pump, follow the manufacturer's
instructions.
MOST CHARGING CIRCUITS are critical because voltage drop can cause a
disproportionate loss of charge current. To charge a battery, a generating device must
apply a higher voltage than already exists within the battery. A voltage drop greater than
5% will reduce this necessary voltage difference, and can reduce charge current to the
battery by a much greater percentage.
WIND GENERATOR CIRCUITS: At most locations, a wind generator produces its full
rated current only during occasional windstorms or gusts. If wire sized for low loss is
large and very expensive, you may consider sizing for a voltage drop as high as 10% at
the rated current. That loss will only occur occasionally, when energy is most abundant.
Consult the wind system's instruction manual.
ALUMINUM WIRE may be more economical than copper for some main lines. Power
companies use it because it is cheaper than copper and lighter in weight, even though a
larger size must be used. It is safe when installed to code with AL-rated terminals. You
may wish to consider it for long, expensive runs of #2 or larger. The cost difference
fluctuates with the metals market. It is stiff and hard to bend, and not rated for
submersible pumps.
12 Volt DC Maximum Length (2 Conductor) for 3% Voltage Loss
1000
100
#4/0
#2/0
#1/0
#2
10
#4
#6
#8
#10
#12
#14
1
1
10
100
Amperage (Operating Current Maximum)
Page 2 of 11
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Life