Lenovo ThinkPad X220 Tablet - Manual (Page 12)

grounding and, in particular, specifies that the cable ground shall be connected to
the grounding system of the building, as close as possible to the point of cable
entry as practical.
Example of antenna grounding
Proper grounding for the cable
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
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Safety and Warranty Guide