Rosemount 8712 - Page 18

Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
2-8
Table 2-1. Length of Annealed
Copper (cu) Wires
Table 2-2. Length of
Hand-drawn Copper (cu) Wires
Figure 2-4. Supply Current
versus Input Voltage
Types of Power
Supply Wires
Maximum Length of the Wire for Each
Corresponding Power Supply Source
Wire
Gauge
Annealed Cu
milliohms/ft
(milliohms/m)
42 V DC
Supply ft (m)
30 V DC
Supply ft (m)
20 V DC
Supply ft (m)
12.5 V DC
Supply ft (m)
20 0.01015
(0.033292)
1478
(451)
887
(270)
394
(120)
25
(8)
18 0.006385
(0.020943)
2349
(716)
1410
(430)
626
(191)
39
(12)
16 0.004016
(0.013172)
3735
(1139)
2241
(683)
996
(304)
62
(19)
14 0.002525
(0.008282)
5941
(1811)
3564
(1087)
1584
(483)
99
(30)
12 0.001588
(0.005209)
9446
(2880)
5668
(1728)
2519
(768)
157
(48)
10 0.000999
(0.003277)
15015
(4578)
9009
(2747)
4004
(1221)
250
(76)
Types of Power
Supply Wires
Maximum Length of the Wire for
Each Corresponding Power Supply Source
Wire
Gauge
Annealed Cu
milliohms/ft
(milliohms/m)
42 V DC
Supply ft (m)
30 V DC
Supply ft (m)
20 V DC
Supply ft (m)
12.5 V DC
Supply ft (m)
18 0.00664
(0.021779)
2259
(689)
1355
(413)
602
(184)
38
(11)
16 0.004176
(0.013697)
3592
(1095)
2155
(657)
958
(292)
60
(18)
14 0.002626
(0.008613)
5712
(1741)
3427
(1045)
1523
(464)
95
(29)
12 0.001652
(0.005419)
9080
(2768)
5448
(1661)
2421
(738)
151
(46)
10 0.01039
(0.003408)
14437
(4402)
8662
(2641)
3850
(1174)
241
(73)
1.0
0.8
0.6
0.4
0.2
0
0
10
20 30
40
50
Power Supply (Volts)
Supply Current (Amps)