15
Figure 3-13 POE power Mode
Lightning Protection of Cable
3.4
It need to use shielded cable and ensure the grounding of two ends of equipment. If the
opposite equipment has plastic enclosure, which cannot be grounding. In this situation,
the shielded cable function is decreased largely.
If its available, it is recommended that Ethernet cable and power cable pass through metal
sleeve to ground separately. And they cannot be in a same metal sleeve.
It is highly recommended that the distance is as nearest as possible between the two
equipment connected by Ethernet cable, avoiding the cable hanging in the air. According
to the wiring environment, the lightning protection demand is different, the details is
described in Table 3-1.
Table 3-1 Lightning Protection Demand of Cable
Number
Environment
Lightning Protection
Demand
1
Completely in indoor or underground
No special demand
2
Outdoor part exceed 3m
4KV(10/700us)
3
Outdoor part exceed 10m
3KA
4
Outdoor part exceed 10m, and application
environment is poor, such as the cable hanging
in the air, strong lightning area, and so on.
5KA
