Rockwell Automation DeviceNet Media Design Installation Guide - Manual (Page 82)

Publication DNET-UM072C-EN-P - July 2004
4-4 Determine Power Requirements
Figure 4.1 One Power Supply (End Segment) Round Cable (Thick). Assumes all
nodes are at the opposite end of the cable from the power supply.
Cu
rr
en
t (
amper
es
)
Length of trunk line, meters (feet)
NEC/CE Code Maximum
Current Limit
Network
Length
m (ft) Maximum
Current (A)
0 (0) 8.00*
20 (66) 8.00*
40 (131)
6.53*
60 (197) 4.63*
80 (262) 3.59
100 (328)
2.93
120 (394)
2.47
140 (459) 2.14
160 (525) 1.89
180 (591)
1.69
200 (656) 1.53
220 (722) 1.39
Network
Length
m (ft) Maximum
Current (A)
240 (787)
1.28
260 (853) 1.19
280 (919) 1.10
300 (984)
1.03
340 (1115)
0.91
360 (1181) 0.86
380 (1247) 0.82
420 (1378)
0.74
440 (1444) 0.71
460 (1509) 0.68
480 (1575)
0.65
500 (1640) 0.63
∗
Exceeds NEC CL2/CECode 4A limit.
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