Lenovo ThinkCentre M57e - Manuel (Page 22)

Example of antenna grounding
1 Ground clamp 5 Power service grounding electrode
system (NEC Article 250, Part H)
2 Antenna lead-in wire 6 Ground clamps
3 Antenna discharge unit
(NEC Section 810-20)
7 Electronic service equipment
4 Grounding conductors
(NEC Section 810-21)
Figure 1. Proper grounding for the cable
18
Safety and Warranty Guide