Connecting The Psu Or Secondary Hub Power Port To Remote Units; Power Distribution Requirements - ZinWave UNITIVITY 5000 User Manual

UNItivity 5000
User Manual
7.4 Connecting the PSU or Secondary Hub Power
Port to Remote Units

7.4.1 Power Distribution Requirements

Power for Remote Units is generally supplied from a centrally located source – either a dedicated PSU
or a Secondary Hub - that drives multiple Remote Units. The distance of the Remote from the
centralized location depends upon the cable type used. Regardless of the cable used, the maximum
loop resistance should generally be kept below 8 ohms to ensure the minimum input voltage
requirement of the Remote Unit is not violated.
Copper wire containing 2 cores is typically used to carry 48V power to Remote Units. This can either
be run in parallel with fiber infrastructure, or as part of a composite cable.
With AWG 16, the maximum distance that can be achieved is approximately 300 m (~1000 ft). If greater
distances are required, larger gauge cable may be used. The Phoenix Contact connectors used on the
Zinwave equipment support wire thickness up to AWG 12. The guidance for the maximum distance
that can be achieved for given AWG wire is as follows, when a single Remote Unit is powered with a
single conductor pair. If 2 collocated Remote Units are powered with a single conductor pair, below
distances are cut in half; likewise, if 4 collocated Remote Units are powered with a single conductor
pair, below distances are cut in 4. When 2 Remote Units are powered from a single Secondary Hub
power port, a maximum of 4 power ports on that Hub can be used; likewise, in the case of 4 Remote
Units, a maximum of 2 power ports on that Hub can be used.
Distance (ft)
≤ 2500
≤ 1500
≤ 1000
≤ 600
≤ 375
≤ 235
AWG wire
size (solid)
24
22
20
18
16
14
12
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Distance (m)
≤ 760
≤ 455
≤ 305
≤ 180
≤ 115
≤ 70
Diameter
(inches)
0.0201
0.0254
0.032
0.0403
0.0508
0.064
0.0808
Recommended AWG wire Size
AWG 12
AWG 14
AWG 16
AWG 18
AWG 20
AWG 22
Resistance per
1000 ft (ohms)
25.67
16.14
10.15
6.385
4.016
2.525
1.588
Resistance per
1000 m (ohms)
84.2
52.7
33.2
20.9
13.2
8.28
5.21
7-2