GB 6830-2025: The tolerable limits of danger on telecommunication lines from power lines

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Scope

This document specifies the tolerable limits for dangerous voltages on telecommunication lines
and dangerous currents flowing through the human body when telecommunication lines are
subjected to danger effects from power lines.
This document applies to various types of power lines, such as AC power lines and AC electrical
railway overhead contact systems, etc., which may have danger effects on adjacent
telecommunication lines under the following states or conditions.
a) Power line fault conditions.
---A single phase of a three-phase symmetrical power line with a directly earthed
neutral is short-circuited to ground;
---A single phase of a three-phase symmetrical power line with a no directly earthed
neutral is short-circuited to ground;
---Two phases of a three-phase symmetrical power line with a no directly earthed
neutral are simultaneously short-circuited to ground at different locations;
---A short-circuited earthing of AC electrical railway overhead contact system wires;
---A short-circuited earthing of other asymmetrical power line wires.
b) Normal operation conditions of power lines.
---AC electrical railway overhead contact system lines are normally operating;
---Other asymmetrical power lines are normally operating.

Basic Data

Standard ID	GB 6830-2025 (GB6830-2025)
Description (Translated English)	The tolerable limits of danger on telecommunication lines from power lines
Sector / Industry	National Standard
Classification of Chinese Standard	P30
Classification of International Standard	91.120.40
Word Count Estimation	10,155
Date of Issue	2025-10-31
Date of Implementation	2026-11-01
Older Standard (superseded by this standard)	GB 6830-1986
Issuing agency(ies)	State Administration for Market Regulation and Standardization Administration of China