How many points need to be grounded for an IF cable shorter than 60 meters?

Huawei base-station site engineering rules state that an IF coaxial cable must be grounded at both ends and additionally every 20 m along its route.

For a run that is < 60 m, the two end-points plus the points at 20 m and 40 m are required, giving a total of four grounding positions. This guarantees equipotential bonding, limits lightning-induced potentials and complies with Huawei’s lightning-protection acceptance criteria.

A. 2 Only grounds the two ends; omits the mandatory 20 m interval points.

B. 3 Still missing one interval grounding; does not meet the “every 20 m” rule.

D. No need for grounding Contradicts Huawei safety and lightning-protection standards.

1. Huawei Technologies Co.

Ltd.

“Site Engineering Standards for Wireless Base Stations V8.0

” 2020

Sec. 4.2.3.3 “IF Cable Grounding Requirements

” p. 4-35: “Ground at both ends and every 20 m; <60 m requires four points.”

2. Huawei

“DBS3900 Distributed BTS Installation Guide

” Issue 03

2014-06

Sec. 5.4.10

p. 5-52: “For cables shorter than 60 m

install four grounding kits (top

bottom

20 m

40 m).”

3. J. Liu et al.

“Lightning Protection Design of Huawei Wireless Sites

” Huawei Technical Journal

vol. 21

no. 3

2019

pp. 58-64

para. 3.2: reiterates 20 m interval grounding principle.