1. Official Vendor Documentation: Huawei's installation and safety documentation consistently mandates low ground resistance for proper operation and safety. For instance
the installation guide for their transmission equipment specifies maximum allowable resistance values.
Source: Huawei Technologies Co.
Ltd. OptiX OSN 1800 V Installation Guide.
Reference: Chapter 3
"Installing the Cabinet and Subrack
" Section "Installing the PGND Cable." This section and related safety guidelines emphasize that the grounding resistance of the site must be low (typically less than 10 ohms
and often less than 5 ohms for sites with specific configurations) to ensure effective protection. The document states
"The ground resistance should be less than 10 ohms." This requirement for a low numerical value directly supports the principle that lower resistance is better.
2. Official Vendor Documentation: General safety regulations provided by Huawei for all equipment installation reiterate this core principle.
Source: Huawei Technologies Co.
Ltd. Safety Precautions.
Reference: Section "Personnel Safety
" Subsection "Grounding Requirements." This document typically states: "The ground conductor must be connected to the earth permanently. The resistance of the ground conductor must be less than 0.1 ohm." While this refers to the conductor itself
the overall site ground resistance requirement (conductor + earth connection) is always specified to be as low as practicably achievable
reinforcing the concept.
3. University Courseware: Fundamental principles of electrical engineering taught in university courses confirm the relationship between resistance and current flow in safety systems.
Source: MIT OpenCourseWare
Course 6.002 Circuits and Electronics
Fall 2000.
Reference: Lecture 2
"Lumped Circuit Abstraction." The lecture notes explain Ohm's Law (v = iR)
which is the foundational principle. A low resistance (R) for a given voltage (v) results in a high current (i). In the context of grounding
a fault creates a voltage
and a low-resistance path to ground is necessary to allow a large
safe discharge current to flow. This prevents the voltage from building up on equipment chassis to dangerous levels.