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Operating Instructions
36
per lead. Table 3-2 lists resistivity for various wire sizes and the maximum lengths that may be used to limit voltage drop to
0.5 volts for various currents. Lengths listed are the sum of the lengths of the ( + ) and ( - ) load wires. Lengths are given in
meters and (feet).
To determine maximum lengths (in meters or feet) for currents not listed, use the formula:
maximum length =
500
current x resistivity
where current is expressed in amps and resistivity is expressed in ohms/kilometer or ohms/1000 feet. If load regulation is
critical, read Remote Voltage Sensing in the following section.
Table 3-2. Maximum Wire Lengths To Limit Voltage Drops
Wire Size Resistivity Maximum Length In Meters (Feet)To
Limit Voltage Drop To 0.5V Or Less
AWG
Cross-
Section Area
In mm
2
Ω/kft Ω/km
5 A 10A 17 A
22 16.15 (6.19) (3.09 (1.82)
0,5 40.1 2,5 1.2 .73
20 10.16 (9.8) (5) (2.8)
0,75 26,7 3,7 1,8 1.1
18 6.388 (15.6) (7.8) (4.6)
1 20,0 5,0 2,5 1.4
16 4.018 (24.8) (12.4) (7.3)
1,5 13,7 7,3 3,64 2.1
14 2.526 (40) (19.7) (11.6)
2,5 8,21 12,2 6,1 3.5
12 1.589 (62.9) 13.46) (18.5)
4 5,09 19.6 9,8 5.7
10 .9994 (100) (50) (29.4)
6 3,39 29.5 14,7 8.6
8 0.6285 (160) (79.5) (46.7)
10 1,95 51,2 25,6 15
6 0.3953 (252) (126.5) (74.4)
16 1,24 80.6 40,3 23.7
4 0.2486 (402) (201) (118)
25 0,795 125.7 62.8 37
2 0.1564 (639) (319) (188)
35 0,565 176.9 88.5 52
50 0,393 254.4 127 74.8
0 0.09832 (1017) (508) (299)
Wire sizes of AWG #14 (2,5mm
2
) or smaller are normally used only for sense leads.
Remember while calculating load wire size that the wire must be large enough not to overheat while
carrying the current that would flow if the load were
shorted.
Table 3-3 lists current-carrying capacity (ampacity) for various sizes of stranded copper wire.
The bus bars are covered by an impact-resistant plastic cover, which is secured to the unit with four M4 x 8 screws. Be
certain to replace the cover after making connections.