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GB 38189-2019 English PDF (GB38189-2019)

GB 38189-2019 English PDF (GB38189-2019)

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GB 38189-2019: Safety of equipment electrically connected to a telecommunication network

GB 38189-2019
Safety of equipment electrically connected to a telecommunication network ICS 35.020
National Standards of People's Republic of China
Safety of electronic equipment connected to communication network
(IEC 62151.2000, IDT)
2019-10-14 released
2020-11-01 implementation
State Administration for Market Regulation
Issued by China National Standardization Administration
Table of contents
Preface Ⅲ
1 Scope 1
1.1 Applicable equipment 1
1.2 Additional requirements 1
1.3 Not applicable 1
1.4 Basic Safety Publication 1
2 Normative references 1
3 Terms and definitions 2
3.1 Basic concepts 2
3.2 Insulation 3
3.3 Equipment electrical ratings 3
3.4 Accessibility 3
3.5 Circuit and circuit characteristics 4
3.6 Grounding 5
3.7 Clearance and creepage distance 5
4 TNV circuit 5
4.1 TNV-0 circuit 5
4.2 TNV-1 circuit, TNV-2 circuit and TNV-3 circuit 7
5 Protection against equipment hazards for maintenance personnel of communication networks and users of equipment connected to communication networks 11 5.1 General requirements 11
5.2 Use of protective grounding 11
5.3 Isolation of communication network and ground 11
5.4 Limitation of the contact current connected to the communication network 12 6 Protection of equipment users from over-voltage on the communication network 13 6.1 Isolation requirements 13
6.2 Dielectric strength test procedure 14
7 Overheating protection of communication wiring system 15
Appendix A (Normative Appendix) Telephone Ringing Signal Guidelines (see 17 A.1 Overview 17
A.2 Method A 17
A.3 Method B 19
Appendix B (Normative Appendix) Pulse Test Generator (see 6.2.1) 21
Appendix C (informative appendix) Pulse test procedure (see 6.2.3) 22
C.1 Test equipment 22
C.2 Test procedure 22
C.3 Example of waveform during pulse test 22
References 24
Figure 1 The highest voltage allowed after a single fault 7
Figure 2 Test voltage generator 9
Figure 3 Test probe 10
Figure 4 Isolation test between communication network and ground 12
Figure 5 Contact current test circuit for single-phase equipment connected to star TN or TT distribution system 13 Figure 6 Contact current test circuit for three-phase equipment connected to star TN or TT distribution system 13 Figure 7 Application point of test voltage 14
Figure A.1 Definition of ringing period and rhythm period 18
Figure A.2 ITS1 limit curve of the rhythmic ringing signal 18
Figure A.3 Peak and peak-to-peak current 19
Figure A.4 Ringing voltage disconnect criterion 20
Figure B.1 Pulse generating circuit 21
Figure C.1 Waveform without a surge suppressor and no insulation breakdown 22 Figure C.2 Waveform during insulation breakdown without surge suppressor 22 Figure C.3 Waveform of sound insulation when the surge suppressor operates 23 Figure C.4 Waveform of surge suppressor and insulation short circuit 23 Table 1 Voltage range of TNV circuit 4
Table 2 Isolation of TNV circuit 8
All technical content of this standard is mandatory.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009. The translation method used in this standard is equivalent to IEC 62151.2000 "Safety of Electronic Equipment Electrically Connected to Communication Networks". The Chinese documents that have consistent correspondence with the normatively cited international documents in this standard are as follows. ---GB/T 2900.73-2008 Electrical terminology grounding and protection against electric shock (IEC 60050-195.1998, MOD) ---GB/T 11918 (all parts) Industrial plug sockets and couplers [IEC 60309 (all parts)] ---GB/T 16499-2017 Compilation of electrical and electronic safety publications, basic safety publications and multi-disciplinary shared safety publications Guidelines for the application of objects (IEC Guide104.2010, NEQ)
This standard has made the following editorial changes.
--- Incorporate the errata of the original standard into this standard, and indicate with a vertical double line (‖) in the blank position outside the corresponding clause; ---IEC 62151.2000 AC peak limit appeared 71V and 70.7V, this standard is unified to 71V; ---Edited the Ipp label in Figure A.3.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This standard was proposed and managed by the Ministry of Industry and Information Technology of the People's Republic of China. Drafting organizations of this standard. The Fifth Institute of Electronics of the Ministry of Industry and Information Technology, China Electronics Standardization Institute, Shenzhen Saixi Information Technology Technology Co., Ltd., Beijing Saixi Technology Development Co., Ltd., China National Accreditation Center for Conformity Assessment, Shenzhen Skyworth Digital Technology Co., Ltd. Company, Inspur (Suzhou) Financial Technology Service Co., Ltd.
The main drafters of this standard. Wang Liwen, Hu Yanfei, Lin Xuanzhu, Liu Yunzhu, He Penglin, Luo Chang, Guo Ziqi, Zhang Jiazhong, Song Wenping, Li Zhidong.
Safety of electronic equipment connected to communication network
1 Scope
1.1 Applicable equipment
This standard applies to equipment designed and scheduled to be directly connected to the communication network, regardless of the power supply. This standard aims to strengthen product safety standards in order to cover all the dangers caused only by connecting to the communication network. The safety requirements and compliance criteria contained in this standard have the following three aspects. a) Maintenance personnel of the communication network and other users of the communication network suffer from the dangers caused by the connected equipment on the communication network Risk protection;
b) Protection of equipment users and maintenance personnel from dangers caused by voltage on the communication network; c) Protection against the danger of overheating the communication wiring system. It is assumed that sufficient measures have been taken in accordance with ITU-T Recommendation K.11 to reduce the peak overvoltage of the equipment exceeding 1.5kV. may. When the equipment is likely to have an overvoltage exceeding 1.5kV peak, additional protective measures may be required in the building facilities, such as Surge suppression measures.
1.2 Additional requirements
For the following equipment, it may be necessary to add some requirements to those safety requirements specified in this standard. ---It is scheduled to be in special conditions such as extremely high or low temperature, excessive dust, high humidity or severe vibration, flammable gas, corrosion or explosive Equipment working under environmental conditions;
---Medical electronic equipment directly connected to the patient's body. 1.3 Not applicable
This standard does not apply to.
---Protection of equipment users and equipment maintenance personnel from the dangers caused by the equipment itself. If the device itself meets the corresponding According to safety standards, it is believed that equipment users and equipment maintenance personnel have been protected from the dangers caused by the equipment itself. ---Performance reliability of equipment and communication network.
---Use of communication network equipment exceeding the TNV circuit voltage limit. 1.4 Basic safety publications
The main purpose of this basic safety publication is to provide technical committees in accordance with the principles of IEC Guide104 and ISO /IEC Guide51. It is used when drafting standards. This standard is not intended to be used by manufacturers and certification bodies. One of the duties of the technical committee is to use basic safety publications during the drafting of publications, as long as applicable. Unless specifically mentioned or Included in the relevant publications, otherwise the requirements, test methods and test conditions in this basic safety publication are not used. If this standard is different from the relevant safety standards, the requirements of the relevant safety standards shall be adopted first. Where this standard describes the use of basic insulation, other levels of insulation or protective grounding, the specific requirements of the relevant product safety standards Be applicable.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 12113-2003 Measurement method of touch current and protective conductor current (IEC 60990.1999, IDT) GB/T 16842-2008 Test tool for testing the protection of housing against people and equipment (IEC 61032.1997, IDT) 3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Basic concepts
Live parts that can cause harmful electric shocks under certain conditions. [GB/T 2900.1-2008, definition 3.5.93]
Touch current
The current that passes through the human body when touching one or more accessible parts. [IEV195-05-21]
Note 1.Rewrite GB/T 2900.1-2008, definition 3.5.84.
Note 2.Touch current was originally included in the definition of the term "leakage current". 3.1.3
Telecommunication network
Metal-terminated transmission media intended for communication between devices, and these devices may be located in different building facilities. Except in the following cases.
---The power supply system for power supply, power transmission and distribution used as a communication transmission medium; ---TV distribution system using cable.
Note 1.The term "communication network" is defined based on its function rather than its electrical characteristics. The communication network itself is not defined as a TNV circuit. Only the circuits in preparation are classified in this way.
Note 2.The communication network may.
--- is public or private;
---Withstand the transient overvoltage caused by atmospheric discharge and the failure of the power distribution system; ---Withstand the permanent longitudinal (common mode) voltage induced by nearby power lines or electric traction lines. Note 3.Examples of communication networks.
---Public telephone switching network;
---Public data network;
---Integrated Services Digital Network (ISDN);
---There is a dedicated network similar to the above-mentioned electrical interface characteristics. 3.2 Insulation
Basic insulation
Insulation that provides basic protection against electric shock.
Additional insulation
Independent insulation applied in addition to basic insulation to reduce the risk of electric shock in the event of basic insulation failure. 3.2.3
Double insulation
Insulation consisting of basic insulation plus additional insulation.
Reinforced insulation
A single insulation structure, under the conditions specified in this standard, provides the level of protection against electric shock equivalent to double insulation. Note. The term "insulation structure" does not mean that the insulation must be a uniform whole. This kind of insulation structure can consist of several additional insulation Or a separate insulating layer composition like basic insulation.
Functional insulation
Only the insulation required for normal operation of the equipment.
Note. The defined functional insulation does not prevent electric shock. However, it can be used to reduce the possibility of ignition and fire hazards. 3.3 Equipment electrical ratings
Rated voltage
The power supply voltage calibrated by the manufacturer (when three-phase AC power is supplied, it refers to the line-to-line voltage). 3.3.2
Rated voltage range
The power supply voltage range calibrated by the manufacturer is expressed by the upper limit rated voltage and the lower limit rated voltage. 3.4 Accessibility
The possibility of being touched.
Note. See
Maintenance staff
Personnel who have received the corresponding technical training and have the necessary experience can realize that they may bring them Danger, and can take measures to minimize the danger to themselves or other personnel. 3.4.3
Anyone other than maintenance personnel.
User contact area
The user under normal conditions.
---Area that can be touched without tools; or
---The area touched in a predetermined way; or
---The area touched as instructed, no matter whether it needs tools or not to touch. In this standard, the terms "contact" and "accessible", unless otherwise specified, are defined as above and refer to the user contact area. 3.4.5
In addition to the contact area of the user, the area that the maintenance personnel must contact during maintenance, even when the equipment is powered on. 3.4.6
Restricted contact area
The area of the device specified in the following two paragraphs.
---An area that can only be accessed by maintenance personnel or users who know the reason for the area restriction and who should take measures; and ---Use tools, locks and buttons or other security measures, and the area that can only be accessed by the responsible agency. 3.4.7
Screwdriver or any other device that can be used to install and remove screws, pins, or similar fasteners. 3.5 Circuit and circuit characteristics
Primary circuit
A circuit directly connected to an external grid power supply or other equivalent power supply (such as a generator set), including the primary winding of the transformer, Motors and other load devices and devices connected to the power grid.
Secondary circuit
Not directly connected to the primary circuit, but powered by a transformer, converter or equivalent isolation device located in the equipment or powered by a battery A kind of circuit.
TNV circuit
The circuit in the equipment with restricted access area (except TNV-0 circuit), the circuit is properly designed and protected to make Under normal working conditions and single fault conditions, its voltage will not exceed the specified limit. Within the meaning of this standard, TNV circuits can be considered as secondary circuits. Note 1.The voltage limits under normal operating conditions and single fault conditions are specified in, and the accessibility requirements for TNV circuits are specified in 4.2.2. As defined in 3.5.4, 3.5.5, 3.5.6, and 3.5.7, TNV circuits are divided into TNV-0, TNV-1, TNV-2 and TNV-3 circuits. Note 2.See Table 1 for the voltage relationship between TNV circuits.
Table 1 Voltage range of TNV circuit
TNV-0 circuit TNV-0 circuit
---Under normal working conditions and single fault working conditions, its working voltage does not exceed a safe value; and ---TNV circuit that does not withstand the overvoltage from the communication network. Note 1.The voltage limits under normal operating conditions and single fault operating conditions are specified in 4.1. Note 2.Within the scope of the IEC standard, different definitions of SELV, PELV and SELV circuits are used. Use the term TNV-0 circuit to avoid the difference Conflict between IEC standards. In GB 4943.1, the TNV-0 circuit is equivalent to the SELV circuit. 3.5.5
TNV-1 circuit
---Under normal working conditions, its normal working voltage does not exceed the limit of the TNV-0 circuit; and ---TNV circuit that may withstand overvoltage from the communication network on its circuit. 3.5.6
TNV-2 circuit
---Under normal working conditions, its normal working voltage exceeds the limit of the TNV-0 circuit; and ---TNV circuit that does not withstand the overvoltage from the communication network. 3.5.7
TNV-3 circuit
---Under normal working conditions, its normal working voltage exceeds the limit of the TNV-0 circuit; and ---TNV circuit that may withstand overvoltage from the communication network on its circuit. 3.6 Grounding
Functional ground
Ground the necessary points in equipment or systems other than safety purposes. 3.7 Electric clearance and creepage distance
Electrical clearance
The shortest spatial distance measured between two conductive parts or between a conductive part and the device interface. 3.7.2
Creepage distance
The shortest path between two conductive parts or between a conductive part and the equipment protection interface measured along an insulating surface. 4 TNV circuit
When evaluating TNV circuit voltage.
---The voltage generated inside the equipment during normal operation and the voltage outside the equipment should be considered; ---Does not consider voltages other than normal operating voltages, such as ground potential rise, voltage induced by power lines and electric traction lines. 4.1 TNV-0 circuit
4.1.1 General requirements
Under normal operating conditions and in the event of a single fault, such as basic insulation failure or single component failure, the TNV-0 circuit The voltage presented should still be a safe voltage that can be touched. Check whether it meets the requirements of 4.1.2~4.1.4 through inspection and related tests. 4.1.2 Voltage under normal working conditions
In a TNV-0 circuit or in several interconnected TNV-0 circuits, under normal conditions, any two conductors of the TNV-0 circuit Or the voltage between circuits, or the voltage between any such conductor and the ground should not exceed 42.4V AC peak value or 60V DC value. Note. The circuit that meets the above requirements but is subject to overvoltage from the communication network is the TNV-1 circuit. 4.1.3 Voltage under single fault condition
Except as permitted by 4.2.1, when a single fault occurs in any insulation (excluding double insulation and reinforced insulation) or any component (not including Double insulation and reinforced insulation) when a single fault occurs, the voltage between any two conductors or circuits of the TNV-0 circuit, or any The voltage between any such conductor and ground should not exceed 42.4V AC peak value or 60V DC value after 0.2s. Moreover, it should not exceed 71V AC peak value or 120V DC value.
Except as permitted by 4.1.4, one of the methods specified in, or should be used for isolation. Under normal working conditions, the parts in the interface circuit that do not meet the requirements of the TNV-0 circuit are not allowed to be touched by the operator. Isolation provided by double or reinforced insulation
If double or reinforced insulation is used to isolate the TNV-0 circuit from other circuits, then the double or reinforced insulation shall comply with the relevant products. Product standard requirements. Isolation provided by the ground shield
If the TNV-0 circuit is isolated from the parts with dangerous voltage by grounding shielding layer or other grounded conductive parts, it will be dangerous. Pressed parts shall be separated from grounded parts by at least basic insulation. Grounding components should comply with the protective grounding requirements in the relevant product standards. Protection provided by the grounding of the TNV-0 circuit
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