HP 6038A - Page 19

WARNING
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.
3-25 Table 3-3 lists current-carrying capacity (ampacity) for
various sizes of stranded copper wire.
3-26 The terminal blocks are protected by impact-resistant
plastic covers, which are secured to the unit with two M4 x
8 screws each. Be certain to replace the covers after making
connections.
3-27 If multiple loads are connected to one supply, each
load should be connected to the supply's output terminals
using separate pairs of connecting wires. This minimizes mutual
coupling effects and takes fuil advantage of the supply’s low
output impedance. Each pair of connecting wires should be as
short as possible and twisted or shielded to reduce noise pickup
and radiation.
3-28 If load considerations require the use of output distribu¬
tion terminals that are located remotely from the supply, then
the power supply output terminals should be connected to the
remote distribution terminals by a pair of twisted or shielded
wires and each load should be separately connected to the
remote distribution terminals. Remote voltage sensing is re¬
quired under these circumstances (paragraph 3-40). Sense either
at the remote distribution terminals, or (if one load is more sen¬
sitive than the others) directly at the most critical load.
Table 3-2. Maximum Wire Lengths To Limit Voltage Drops
Wire Size
Resistivity
Maximum Length In Metres (Feet)To Limit
Voltage Drop To 0.5V Or Less
AWG
Cross-
Section
Area
in mm^
Q/kft
fi/km 5A 10A 20A
30A
22
16.15
(6) (3) (1.5) (1)
0,5
40,1 2,5
1.2 0,6
0,4
20
10.16
(9.5) (4.5)
(2) (1.5)
0,75
26,7
3,7
1.9
0,9 0,6
18
6.388 (15.5) (7.5) (3.5)
(2.5)
1
20,0
5,0 2,5
1,3
0,8
16
4.018 (24.5) (12)
(6) (4)
1,5
13,7
7,3
3,6 1,8
1,2
14
2-526 (39.5) (19.5)
(9.5) (6.5)
2,5
8,21 12,2
6,1
3,0 2,0
12
1.589 (62.5) (31)
(15.5) (10.5)
4
5,09 19,6 9,8 4,9
3,3
10
0.9994 (100) (50)
(25) (17)
6
3,39 29 14,7
7,4 4,9
8
0.6285 (159)
(79) (39.5) (27)
10
1,95 51 25 12,8
8,5
6 0.3953 (252) (126) (63)
(4)
16
1,24
80 40 20
13,4
4 0.2486
(402) (201) (100)
(68)
25 0,795 125
62 31 20
2
0.1564 (639) (319)
(159) (108)
35
0,565 176 88
44 29
50
0,393
254 127 63 42
0
0.09832 (1020) (509)
(254) (173)
Wire sizes of AWG #14 (2,5mm^) or smaller are normally used only for sense leads.
3-6