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The tolerable limits of danger on telecommunication lines from power lines
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GB 6830-2025: The tolerable limits of danger on telecommunication lines from power lines
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB6830-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.40
CCS P 30
Replacing GB 6830-1986
The Tolerable Limits of Danger on Telecommunication Lines
from Power Lines
Issued on: OCTOBER 31, 2025
Implemented on: NOVEMBER 1, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Tolerable Limit of Dangerous Current Caused by Capacitive Coupling... 7
5 Tolerable Limit of Dangerous Magnetic Induction Voltage Caused by Inductive
Coupling... 7
5.1 General Principles... 7
5.2 Fault Conditions of Power Lines... 7
5.3 Normal Operating Conditions of Power Lines... 9
6 Tolerable Limit of Ground Potential Difference Caused by Resistive Coupling... 9
Bibliography... 10
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement for GB 6830-1986 The Tolerable Limits of Danger on
Telecommunication Lines from Power Lines. In comparison with GB 6830-1986, apart from
structural adjustments and editorial modifications, the main technical changes are as follows.
---Several terms and their definitions, including “danger effect”, “power line” and
“electrical railway overhead contact system” are added (see Chapter 3);
---The requirements for the tolerable limits of hazardous longitudinal electromotive force
caused by magnetic induction on open telecommunication lines are deleted (see
Chapter 3 of Version 1986);
---The tolerable limits for safe voltage considering the duration of faults in power lines are
added (see 5.2.1);
---The tolerable limits for hazardous magnetic induction voltage on telecommunication
optical cable lines are added (see 5.2.2);
---The protective measures are deleted (see Chapter 5 of Version 1986).
Please be noted that certain content of this document may involve patents. The issuing
institution of this document does not undertake the responsibility of identifying these patents.
This document was proposed by and shall be under the jurisdiction of Ministry of Industry and
Information Technology of the People’s Republic of China.
The issuing of the previous versions.
---First issued in 1986 as GB 6830-1986;
---This is the first revision.
The Tolerable Limits of Danger on Telecommunication Lines
from Power Lines
1 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.
2 Normative References
This document does not have normative references.
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 danger effect
The voltage and current generated by electromagnetic induction from power lines on
telecommunication lines can endanger personal safety, damage telecommunication lines or
equipment, and cause fires in structures.
[source. DL/T 5033-2023, 2.1.7, modified]
3.2 power line
A general term for AC power lines and AC electrical railway overhead contact systems.
NOTE. it transmits power frequency (50 Hz) AC.
3.3 electrical railway overhead contact system
An overhead wire system that supplies electrical energy to locomotives via a pantograph.
NOTE. it is mainly composed of support, foundation, supporting structure and contact suspension.
[source. GB/T 50262-2024, 17.3.1, modified]
3.4 directly earthed neutral
An earthing mode in which the neutral point of a transformer in a power system is directly
earthed or earthed through a low-impedance connection.
3.5 no directly earthed neutral
An earthing mode in which the neutral point of a transformer in a power system is not earthed
or is earthed through an arc-suppression coil or a high-impedance connection.
3.6 telecommunication lines
Communication lines, such as overhead or buried cables, and overhead or buried optical cables,
and wired broadcasting (signal, feeder, subscriber) lines.
3.7 capacitive coupling
The phenomenon where the electric field generated by a voltage-carrying line (inducing
conductor) affects another line (induced conductor).
NOTE. it is quantified by the capacitance coefficients between conductors and between each
conductor and the ground.
3.8 inductive coupling
The phenomenon where the magnetic field generated by a current-carrying line (inducing
conductor) affects another line (induced conductor).
NOTE. it is quantified by the mutual impedance between two conductors with a common earthed
loop.
3.9 resistive coupling
The phenomenon where current flowing from one conductor structure (inducing conductor) to
the ground affects another conductor structure (induced conductor).
NOTE. it is quantified by the conductance between these conductors (structures).
3.10 induced longitudinal electromotive force
The potential difference induced between any two points on a telecommunication line by
inductive coupling between currents in a power line and the ground.
[source. DL/T 5033-2023, 2.1.12, modified]
4 Tolerable Limit of Dangerous Current Caused by
Capacitive Coupling
In the event of a single-phase short-circuit to ground fault of a three-phase symmetrical power
line with a no directly earthed neutral, and under normal operating conditions of AC electrical
railway overhead contact system lines and other asymmetrical power lines, when a person
touches a nearby telecommunications line wire, the tolerable limit of the current flowing
through the human body caused by capacitive coupling is 15 mA (RMS).
5 Tolerable Limit of Dangerous Magnetic Induction Voltage
Caused by Inductive Coupling
5.1 General Principles
Induced longitudinal electromotive force and induced voltage to ground are collectively
referred to as magnetic induction voltage, and both shall comply with the requirements of this
document regarding the tolerable limit of dangerous magnetic induction voltage.
5.2 Fault Conditions of Power Lines
5.2.1 Tolerable limit of dangerous magnetic induction voltage on telecommunication cable
lines
The tolerable limit of magnetic induction voltage on the telecommunication cable cores shall
comply with the following provisions.
a) When telecommunications cable cores have an insulated transformer at both ends, or
one end of the cable is an insulated transformer while the other end is earthed through
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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