GB 16895.6-2000 Electrical installations in buildings Part 5: Selection and installation of electrical equipment Chapter 52: Wiring systems
Some standard content:
GB 16895. 62000
This standard is formulated based on the International Electrotechnical Commission IEC60364-5-52:1993 Electrical Installations in Buildings Part 5: Selection and Installation of Electrical Equipment Chapter 52: Wiring Systems\ and its first amendment (1997), and is equivalent to the above publications in terms of technical content. The numbering sequence of the articles and tables of this standard is still compiled according to IEC60364-5-52, without any change. Some articles of IEC60364-5-52 only list the titles or only stipulate part of the content, and other contents are under consideration. This standard retains the compilation form of these articles when it is adopted. The scope of application of this standard is the same as that of the national standard GB16895.1-1997 Electrical Installations in Buildings Part 1: Scope, Purpose and Basic Principles.
GB16895 is divided into the following seven parts under the general title of "Electrical Installations in Buildings": Part 1: Scope, purpose and basic principles Part 2 Significance
Part 3: Evaluation of general characteristics
Part 4: Safety protection
Part 5: Selection and installation of electrical equipment Part 6: Inspection
Part 7: Requirements for special installations or locations This standard is Chapter 52 in Part 5.
This standard is proposed by the State Machinery Industry Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization of Electrical Installations in Buildings. This standard was drafted by Shanghai Cable Research Institute, Huzhou Jiuli Fire-Resistant Cable Co., Ltd., Jiangsu Baosheng Cable Transformer Co., Ltd., and Jiangsu New Far East Cable Co., Ltd.
The main drafters of this standard are: Liu Songbo, Tu Hanhai, Zhou Yueliang, Pan Chenxi, and Yu Zhengming. GB16895.6—2000
IEC Foreword
1) IEC (International Electrotechnical Commission) is a worldwide organization for standardization, which is composed of all national electrotechnical committees (IEC National Committees). The purpose of IEC is to promote international cooperation on standardization issues in the electrical and electronic fields. For this purpose, among other activities, IEC publishes International Standards. The preparation of standards is entrusted to technical committees; any IFC National Committee interested in the subject covered by the standard participates in this work, and international, governmental and non-governmental organizations affiliated with the EC also participate in this work. IEC and the International Organization for Standardization ISO cooperate closely under the conditions determined by agreement between the two organizations. 2) Formal decisions or agreements of the EC on technical issues are made by professional committees composed of national committees with special interest in them, and international consensus on the issues involved is achieved as far as possible. 3) These decisions or agreements published in the form of standards, technical reports and guidelines are recommended for international use and are recognized by the National Committees in this sense.
4) In order to promote international unification, IEC National Committees should undertake to apply IEC international standards to the greatest extent possible in their national or regional standards. Any inconsistencies between IEC standards and corresponding national or regional standards should be clearly pointed out in their national or regional standards.
International Standard IEC 60364-5-52 was prepared by EC Technical Committee No. 64: Electrical Installations in Buildings. The text of this standard is based on the following documents: June Rule/DIS Document
64(CQ)174
Voting Report
64(CO)188
February Rule
64(COJ189
Voting Report
64(CO)205
Voting Approval All information on this standard can be found in the "Voting Report" listed in the table above. IEC 60364 consists of the following parts under the general title "Electrical Installations in Buildings": Part 1: Scope, purpose and basic principles Part 2: Definitions
Part 3: 520.1 When selecting and laying out wiring systems, the protection methods for cables (conductors) and their terminals or intermediate joints, as well as their supports (hangers) and casings against external influences shall use GB 16895.6—2000. 16895.1-1997 basic principles. Note: This standard is also generally applicable to protective wires, but GB 16895. 3-1997 contains more requirements for protective wires 520.2 Reference standard
The provisions contained in the following standards constitute the provisions of this standard through reference in the standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB4208-1993 Enclosure protection degree (IP code) (eqvIEC60529:1989) GB7251.2~-1997 Low-voltage complete switchgear and control equipment Part 2: Special requirements for busbar ten-wire system (bus duct) (idt IEC 60439-2:1987)
GB/T12666.2-1990 Wire and cable combustion test method Part 2: Single wire and cable vertical combustion test method (egvIEC 60332 1:1979)
GB16895.1—1997 Electrical installations in buildings Part 1: Scope, purpose and basic principles (idtIEC60364-1:1992) IEC 60364-3:1992 Electrical installations in buildings Part 3: General characteristics evaluation IEC60364-4-473:1977 Electrical installations in buildings Chapter 47: Safety protection Section 473: Overcurrent protection IEC60364-5-523:1983 Electrical installations in buildings Chapter 52: Wiring system Section 523: Current limiting IEC 60614 Technical requirements for conduits for electrical installations [EC61200-52:1993 Guidelines for electrical installation Chapter 52: Selection and installation of electrical equipment Wiring system ISO834.1975 Fire resistance test Building structure components 521 Type of wiring system
521.1 If the requirements for external influences are included in the relevant product standard, the digital installation method of the wiring system should be selected according to the model of the wire or cable used in accordance with the provisions of Table 52F. 521.2 The laying method of the wiring system should be selected according to the laying conditions in accordance with the provisions of Table 52G. 521.3 Examples of wiring systems are shown in Table 52H. Note: Other types of wiring systems not included in this standard may also be used if they meet the general requirements of this standard. 521.4 Busbar grid system:
The busbar duct system shall comply with GB7251.2 and shall be designed according to the manufacturing instructions and the requirements of 522522.1.1, 522.3.3, 522.8.1.6 of this standard (except for 522.1.8.7 and 522.1.8 approved by the State Administration of Quality and Technical Supervision on January 3, 2000 and implemented on August 1, 2000), 525, 526, 527 and 528. 521.5 AC circuit
When the conductors of the AC circuit are laid in a ferromagnetic material casing, all phase conductors and neutral conductors shall be arranged in the same casing. Note: If this condition cannot be met, overheating and voltage drop exceeding the allowable voltage drop may occur due to induction. 521.6 Duct and trough system
It is permitted to lay multiple circuits in the same duct or trough provided that the insulation of all conductors can withstand the highest nominal voltage that may occur.
522 Selection and laying of wiring system according to external influences Note: This section only includes the external influences that are more important to the wiring system as mentioned in Chapter 32 of IEC 60364-3. 522.1 Ambient temperature (AA) (see 321.1) 1) 522.1.1 The wiring system selected and laid should be suitable for the maximum ambient temperature of the site and ensure that it does not exceed the maximum allowable temperature shown in Table 52A of IEC 60364-5-523:1983.
522.1.2 Wiring system components (including cables and their accessories) shall be laid and operated within the allowable temperature range specified by the manufacturer or the relevant product standards or instructions.
Table 52F Wiring system selection (according to conductor form) Installation method
Wire and cable
Bare wire
Insulated wire
Sheathed cable (including armored and mineral insulated cables)
Allowed!
Number Installation conditions
Multi-core cable
Single-core cable
No fixation
Not allowed, 0
No fixation
In the duct of the building
Cable structure
Buried in the structure
Immersed in water
Wire clamp fixation
Not applicable or generally not used in practice.
Electric cable installation (including footboard duct
cable metal
and floor cable guards)
Table 52G Wiring system data (according to laying conditions) Laying method Www.bzxZ.net
Cable duct (including side duct and floor cable guide)
31.32.71,72
Cable basin
Note: For the flow of wires and cords under the conditions of the installation, see IEC60364-5-523. The numbers in the box are the drawing numbers in Table 52H.
Not allowed, (not applicable, generally not used,
1) See 321 in IEC 60364-3 and 323. Cable rack cable tray cable ladder cable tray cable support cable rack 12.13,14,15,16 12,13,14.15,16 12,13,14,15,16 12,13.14,1516 On the insulated winding wire On the insulated winding wire, GB16895.6—2000 t||Table 52H Example of laying method 15
Note: This figure is not for describing the actual product or actual installation, but only for describing the method
Application description:
In the specific process, the manufacturer should select the installation method according to the relevant standards. Description
Insulated conductor is installed in the conduit of the thermal insulation. Multi-core electric conductor is installed in the conduit of the thermal insulation wall. Insulated conductor is installed in the pipe on the body
Single-core or multi-core cable is laid in the conduit on the surface of the body. Insulated conductor is installed on the wall. Single-core or multi-core cables are laid in cable boxes on the wall. Insulated wires are laid in conduits in the body. Single-core or multi-core cables are laid in conduits in the body. Sheathed, or equipped with electrical shields, or sheathed single-core or multi-core armored cables are laid on the wall. GB16895.6—200g. Table 52H (continued) Installed on the ceiling. Installed on trays without holes. Installed on trays with holes. Installed vertically or horizontally on brackets.
Laid on the ceramic clamping plate, and leave a certain gap between it and the wall or ceiling
The number is installed on the ladder frame
Single-core multi-core sheathed cable is suspended on the sling or combined with the sling
Bare wire or insulated wire is installed on the insulator
Single-core or multi-core sheathed cable is installed in the hole of the building. The insulated wire is installed in the duct in the hole of the building. The single-core or multi-core cable is laid in the conduit in the hole of the building. Drawing No.
8888822
GB 16895.6-2000
Table 52H (continued)
Number of insulated conductors in electrical boxes installed in building openingsNumber of single-core or multi-core cables installed in electrical boxes installed in building openings
Insulated conductors in cable boxes installed in roofsSingle-core or multi-core cables installed in electrical boxes in brickworkSingle-core or multi-core cables with sheaths installed in a ceiling gap
In hanging cabinets
Single-core or multi-core cables
In electrical boxes installed horizontally on walls
In electrical boxes installed vertically on wallsNumber of insulated conductors in cable trays flush with the floor or wallSingle-core or multi-core cables installed in cable trays flush with the floor or wall
80888888
GB 16895.6—2000
Table 52H (continued)
Insulated conductors laid in suspended cable traysSingle-core or multi-core cables installed in suspended cable groupsInsulated conductors and cables installed vertically or horizontally in conduits in closed cable ducts
Insulated conductors installed in conduits in ventilated cable ducts in floors
Single-core or multi-core sheathed cables laid vertically or horizontally in sheltered or ventilated cable passages
Multi-core sheathed cables directly buried in thermal insulation Single-core or multi-core sheathed cables directly buried in buildings without additional mechanical protection
Additional mechanical protection
Single-core or multi-core sheathed cables installed in underground conduits or cable boxes
522-2 External heat sources
GB 16B95.6—2000
Table 52H (end)
Sheathed single-core or multi-core sheathed cables directly buried underground with additional mechanical protection
Additional mechanical protection
Insulated wires laid in decorative wire plugs
Insulated wires laid in display foot boxes Digital and communication electrical spaces
Insulated wires in conduits or single-core sheathed cables laid in wire feet (frame edges)
--Insulated wires in window frames
Single-core or multi-core sheathed cables immersed in water
522.2.1 In order to avoid the influence of external heat sources, one of the following methods or equivalent methods should be used to protect the wiring system: Protective cover
--Place it away from the heat source The source is far enough away. When selecting the wiring system, appropriate consideration should be given to the possible additional temperature rise. Partially strengthen or replace the insulation material.
Note: The heat from the external heat source may be obtained by the following heat sources: hot water system:
—factory equipment and lighting
production process #
—heat conduction through heat-conducting materials
GB16895.6—2000
The absorption of sunlight by the wiring system and its surrounding medium, 522.3 Water situation (AD) (see 321.4) 522.3.1 The selection and installation of the wiring system should not be damaged by water ingress. The completed wiring system should meet the IP protection level corresponding to the area.
Note: The insulation and sheath of the fixed wiring system can be considered as waterproof if they are intact. Special measures should be taken for cables that are splashed, immersed or not exposed to water.
522.3.2 Where water may accumulate or condense in the wiring system, drainage measures shall be taken. 522.3.3 Where the wiring system is likely to be impacted by waves (AD6), one or more of the methods provided in 522.6, 522.7 and 522.8 shall be used to protect the wiring system from mechanical damage. 522.4 Where there are foreign particulate matter (AF) (see 321.5). 522.4-1 The selection and laying of the wiring system shall minimize the danger caused by the entry of foreign particulate matter. The completed wiring system shall comply with the IP protection level corresponding to the location. 522.4.2 Where there is a large amount of dust (AF4), measures shall be taken to prevent the accumulation of dust (other materials) in large quantities so that the accumulation does not hinder the heat dissipation of the wiring system.
Note: The belt must have a wiring system that is easy to remove dust (see 529). 522.5 Presence of corrosive (polluting) substances (AF) (see 321.6) 522.5.1 Places where corrosive or polluting substances (including water) are present are likely to corrode and damage the wiring system. For parts that may be affected, appropriate protective measures should be taken or they should be made of corrosion-resistant materials. Note: Additional protection methods applicable during laying include: wrapping, greasing or grease. 522.5.2 Dissimilar metals that are prone to electrolysis should not contact each other unless special measures are taken to avoid the effects of contact. 522.5.3 Two materials that are likely to deteriorate or dangerously damage themselves or each other should not contact each other. 522-6 Impact (AC) (see 321.7.1)
522.6.1 When selecting and laying the wiring system, damage caused by mechanical stress such as impact, puncture or extrusion should be avoided. 522.6.2 Fixed wiring systems in places where medium (AG2) or high (AG3) impacts may occur should adopt the following protection measures:
-- Reasonable use of the mechanical strength of the wiring system itself; - Correct selection of wiring sections:
Adopt local or overall enhanced mechanical protection; - Comprehensive adoption of the above measures.
522.7 Perturbation (AH) (see 321.7.2)
522.7.1 When the wiring system is placed or fixed on the equipment frame subject to medium intensity (AH2) or high intensity (AH3) vibration, the wiring system, especially the cables and cable intermediate connection boxes, should be adapted to such conditions. Note: Special attention should be paid to the connection between the wiring and the vibrating equipment. Local measures can be adopted, such as flexible connection. 522.7.2 Cables with soft core wires should be used for suspended fixed electrical equipment such as lighting. In places where movement or vibration is impossible, cables with non-soft core wires can be used.
522.8 Other mechanical stresses (AJ) (see 321.7.3) 522.8.1 When selecting and designing the wiring system, avoid damage to the sheath and insulation of cables and insulated wires and their terminals during installation, use or maintenance.
522.8.1.1 When burying the lines in the building, the pipeline and cable box system should be fully installed before the cables and insulated wires are inserted. 522.8.1.2 Each bending radius of the wiring system should prevent the wires and cables from being damaged. 522.8-1.3 When the wires and cables cannot be supported continuously due to the number of installation methods, appropriate methods should be used to support the wires and cables at appropriate intervals to prevent them from being damaged by their own weight. 522.8.1.4 When the wiring system is subjected to continuous tension (its own weight when laid vertically), the type and cross-section of the cable (wire) and the laying method should be appropriately selected to prevent the wires and cables from being damaged by their own weight. 522.8.1.5 The wiring system that needs to pass in or out the cable (wire) should have sufficient channels for operation. 522.8.1.6 The wiring system buried in the floor should have adequate protection measures to prevent it from being damaged by the use of the floor. 522.8.1.7 The wiring system fixed and buried in the wall should be installed vertically, horizontally or parallel to the side of the room. The wiring system hidden in the building but not fixed can be laid according to the shortest practical path. 522.8.1.8 When installing the flexible wiring system, the conductors and connectors should be protected from excessive tension. 522.9 Where there are vegetation and/or poisonous fungi (AK) (see 321.8) 522.9.1 Where it is expected that the hazards (AK2) mentioned in this section may occur, an appropriate wiring system should be selected or special protective measures should be adopted according to the situation.
Note: A digital design method that is easy to eliminate such growths can be used (see 529). 522.10 Where there are animals (AL) (see 321.9) 522.10.1 Where there are or it is expected that the hazards (AL2) mentioned in this section may occur, an appropriate wiring system should be selected or special protective measures should be adopted according to the situation, such as:
- Reasonable use of the mechanical strength of the wiring system itself; or Correct selection of the laying area; or
Adopt additional local or overall mechanical protection; or - A combination of the above measures.
522.11 Solar radiation (AN) (see 321.11) 522.11.1 Where there is or is expected to be strong solar radiation (AN2), a suitable wiring system should be selected and laid, or an appropriate protective cover should be used.
Note: For the treatment of plant rise, see 522-2.1. 522.12 Earthquake influence (AP) (see 321.12) 522.12.1 When selecting and laying a wiring system for ground hazards in the laying area, 522.12.2 In places with low-intensity (AP2) or relatively remote ground records, special attention should be paid to the following points: - The way the wiring system is fixed to the building structure - Flexible connections should be used for the connection between fixed lines and all important equipment (such as security facilities). 522.13 Wind (AR) (see 321.14)
522.13.1 See 522.7* Vibration (AH)* and 522.8\ Other mechanical stresses (AJ) 522.14 Building design (CB) (see 323.2) 522.14.1 Where there is a risk of danger due to the displacement of the building (CB3), the cable supports and protective devices used shall allow appropriate movement to protect the conductors and cables from excessive mechanical stress. 522.14.2 For movable or movable structures (CB4), a flexible wiring system shall be used. Note: See 522.7\ Vibration (AH)\, 522.8\ Other mechanical stresses (AL)\ and 522.12\ Earthquake effects (AP)\. 523 Flow
See IEC60364-5-523.
524 Conductor cross section
524.1 The cross section of each phase conductor in an AC circuit and the cross section of the live conductor in a DC circuit shall not be less than the values given in Table 52J. 524.2 In the following cases, the neutral conductor shall have the same cross section as the phase conductor. - Single-phase two-wire circuits regardless of the cross section: GB16895.6-2000
In multi-phase and single-phase three-wire circuits, the cross section of the phase conductor shall not be greater than 16 mm (copper) or 25 mm (aluminum). 524.3 In multi-phase circuits, the cross section of each phase conductor is greater than 16 mm (steel) or 25 mm (aluminum) and all of the following conditions are met, the neutral conductor area may be smaller than the phase conductor area.
In normal operation, the maximum current expected in the neutral conductor (including harmonic currents, if any) shall not be greater than the allowable current carrying capacity of the reduced neutral conductor cross section.
Note: In normal operation, the load current of each phase of the circuit should be evenly distributed. Neutral conductors shall be protected against overcurrent in accordance with 473.3.2 of IEC60364-4-473. - The cross-section of the neutral conductor shall not be less than 16mm (copper) or 25mm (aluminum). Table 52I Minimum cross-section of conductors
Wiring system type
Electrical system and insulated conductors
Flexible connection of insulated wires and cables
Line use
Power and lighting
Emergency
Signal and control circuits
Power (supply) circuits
Signal and control circuits
For specific electrical equipment
Any other purpose
Special-purpose extra-low voltage circuits
Terminals (or terminals) of aluminum conductors shall be tested and approved for such specific use. 2 The minimum conductor area allowed for signal and control lines used in electronic equipment is 0.1 mm\3 Note 2 also applies to multi-core cables with seven or more cores. 525 Voltage drop in user installations
Under consideration.
2.5 (see Note 1)
0.5 (see Note 2)
According to the relevant IEC publications
0.75 (see Note 3)
Note: If there are no other considerations, the actual voltage drop between the incoming line of the user's electrical installation and the equipment should not be greater than 4% of the rated voltage of the installation. Other considerations: including the starting time of motors and equipment with large inrush currents. Decompression conditions such as decompression voltage and voltage changes caused by misoperation can be ignored.
526 Electrical connections (see IEC61200-52)
526.1 The connections between conductors and between conductors and other electrical equipment should ensure electrical continuity and have appropriate mechanical strength and protection measures.
526.2 The selection of the connection method should reasonably consider the following factors: the conductor material of the wire and its insulation material: the shape and number of the core wires that make up the wire;
- the cross-section of the conductor:
- the number of wires to be connected,
Note: Welding connections should be avoided in power cables. If used, the thread change and mechanical strength of the joint must be considered (see 522.6, 522.7 and 522.8). 526.3 All joints should be easy to inspect, test and maintain, except for the following: Rationally laid cable joints;
Joints filled or sealed with composites!6--2000
Select wires and cables to prevent them from being damaged by their own weight. 522.8.1.4 When the wiring system is subjected to continuous tension (its own weight when laid vertically), the type and cross-section of the cable (wire) and the laying method should be appropriately selected to prevent the wires and cables from being damaged by their own weight. 522.8.1.5 The wiring system that needs to insert or pull out the cable (wire) should have sufficient channels for operation. 522.8.1.6 The wiring system buried in the floor should have adequate protection measures to prevent it from being damaged by the use of the floor. 522.8.1.7 The wiring system fixed and buried in the wall should be installed vertically, horizontally or parallel to the side of the room. The wiring system hidden in the building but not fixed can be laid according to the shortest practical path. 522.8.1.8 When installing the soft wire wiring system, it should avoid excessive tension on the wires and connectors. 522.9 Where vegetation and/or poisonous fungi are present (AK) (see 321.8) 522.9.1 Where it is expected that the hazards (AK2) mentioned in this section may occur, appropriate wiring systems should be selected or special protective measures should be adopted according to the circumstances.
Note: Digital installation methods that facilitate the elimination of such growths may be adopted (see 529). 522.10 Where animals are present (AL) (see 321.9) 522.10.1 Where it is expected that the hazards (AL2) mentioned in this section may occur, appropriate wiring systems should be selected or special protective measures should be adopted according to the circumstances, such as:
- Reasonable use of the mechanical strength of the wiring system itself; or Correct selection of the laying area; or
Adoption of additional local or overall mechanical protection; or - A combination of the above measures.
522.11 Solar radiation (AN) (see 321.11) 522.11.1 Where there is or is expected to be strong solar radiation (AN2), a suitable wiring system should be selected and laid, or an appropriate protective cover should be used.
Note: For the treatment of plant rise, see 522-2.1. 522.12 Earthquake influence (AP) (see 321.12) 522.12.1 When selecting and laying a wiring system for ground hazards in the laying area, 522.12.2 In places with low-intensity (AP2) or relatively remote ground records, special attention should be paid to the following points: - The way the wiring system is fixed to the building structure - Flexible connections should be used for the connection between fixed lines and all important equipment (such as security facilities). 522.13 Wind (AR) (see 321.14)
522.13.1 See 522.7* Vibration (AH)* and 522.8\ Other mechanical stresses (AJ) 522.14 Building design (CB) (see 323.2) 522.14.1 Where there is a risk of danger due to the displacement of the building (CB3), the cable supports and protective devices used shall allow appropriate movement to protect the conductors and cables from excessive mechanical stress. 522.14.2 For movable or movable structures (CB4), a flexible wiring system shall be used. Note: See 522.7\ Vibration (AH)\, 522.8\ Other mechanical stresses (AL)\ and 522.12\ Earthquake effects (AP)\. 523 Flow
See IEC60364-5-523.
524 Conductor cross section
524.1 The cross section of each phase conductor in an AC circuit and the cross section of the live conductor in a DC circuit shall not be less than the values given in Table 52J. 524.2 In the following cases, the neutral conductor shall have the same cross section as the phase conductor. - Single-phase two-wire circuits regardless of the cross section: GB16895.6-2000
In multi-phase and single-phase three-wire circuits, the cross section of the phase conductor shall not be greater than 16 mm (copper) or 25 mm (aluminum). 524.3 In multi-phase circuits, the cross section of each phase conductor is greater than 16 mm (steel) or 25 mm (aluminum) and all of the following conditions are met, the neutral conductor area may be smaller than the phase conductor area.
In normal operation, the maximum current expected in the neutral conductor (including harmonic currents, if any) shall not be greater than the allowable current carrying capacity of the reduced neutral conductor cross section.
Note: In normal operation, the load current of each phase of the circuit should be evenly distributed. Neutral conductors shall be protected against overcurrent in accordance with 473.3.2 of IEC60364-4-473. - The cross-section of the neutral conductor shall not be less than 16mm (copper) or 25mm (aluminum). Table 52I Minimum cross-section of conductors
Wiring system type
Electrical system and insulated conductors
Flexible connection of insulated wires and cables
Line use
Power and lighting
Emergency
Signal and control circuits
Power (supply) circuits
Signal and control circuits
For specific electrical equipment
Any other purpose
Special-purpose extra-low voltage circuits
Terminals (or terminals) of aluminum conductors shall be tested and approved for such specific use. 2 The minimum conductor area allowed for signal and control lines used in electronic equipment is 0.1 mm\3 Note 2 also applies to multi-core cables with seven or more cores. 525 Voltage drop in user installations
Under consideration.
2.5 (see Note 1)
0.5 (see Note 2)
According to the relevant IEC publications
0.75 (see Note 3)
Note: If there are no other considerations, the actual voltage drop between the incoming line of the user's electrical installation and the equipment should not be greater than 4% of the rated voltage of the installation. Other considerations: including the starting time of motors and equipment with large inrush currents. Decompression conditions such as decompression voltage and voltage changes caused by misoperation can be ignored.
526 Electrical connections (see IEC61200-52)
526.1 The connections between conductors and between conductors and other electrical equipment should ensure electrical continuity and have appropriate mechanical strength and protection measures.
526.2 The selection of the connection method should reasonably consider the following factors: the conductor material of the wire and its insulation material: the shape and number of the core wires that make up the wire;
- the cross-section of the conductor:
- the number of wires to be connected,
Note: Welding connections should be avoided in power cables. If used, the thread change and mechanical strength of the joint must be considered (see 522.6, 522.7 and 522.8). 526.3 All joints should be easy to inspect, test and maintain, except for the following: Rationally laid cable joints;
Joints filled or sealed with composites!6--2000
Select wires and cables to prevent them from being damaged by their own weight. 522.8.1.4 When the wiring system is subjected to continuous tension (its own weight when laid vertically), the type and cross-section of the cable (wire) and the laying method should be appropriately selected to prevent the wires and cables from being damaged by their own weight. 522.8.1.5 The wiring system that needs to insert or pull out the cable (wire) should have sufficient channels for operation. 522.8.1.6 The wiring system buried in the floor should have adequate protection measures to prevent it from being damaged by the use of the floor. 522.8.1.7 The wiring system fixed and buried in the wall should be installed vertically, horizontally or parallel to the side of the room. The wiring system hidden in the building but not fixed can be laid according to the shortest practical path. 522.8.1.8 When installing the soft wire wiring system, it should avoid excessive tension on the wires and connectors. 522.9 Where vegetation and/or poisonous fungi are present (AK) (see 321.8) 522.9.1 Where it is expected that the hazards (AK2) mentioned in this section may occur, appropriate wiring systems should be selected or special protective measures should be adopted according to the circumstances.
Note: Digital installation methods that facilitate the elimination of such growths may be adopted (see 529). 522.10 Where animals are present (AL) (see 321.9) 522.10.1 Where it is expected that the hazards (AL2) mentioned in this section may occur, appropriate wiring systems should be selected or special protective measures should be adopted according to the circumstances, such as:
- Reasonable use of the mechanical strength of the wiring system itself; or Correct selection of the laying area; or
Adoption of additional local or overall mechanical protection; or - A combination of the above measures.
522.11 Solar radiation (AN) (see 321.11) 522.11.1 Where there is or is expected to be strong solar radiation (AN2), a suitable wiring system should be selected and laid, or an appropriate protective cover should be used.
Note: For the treatment of plant rise, see 522-2.1. 522.12 Earthquake influence (AP) (see 321.12) 522.12.1 When selecting and laying a wiring system for ground hazards in the laying area, 522.12.2 In places with low-intensity (AP2) or relatively remote ground records, special attention should be paid to the following points: - The way the wiring system is fixed to the building structure - Flexible connections should be used for the connection between fixed lines and all important equipment (such as security facilities). 522.13 Wind (AR) (see 321.14)
522.13.1 See 522.7* Vibration (AH)* and 522.8\ Other mechanical stresses (AJ) 522.14 Building design (CB) (see 323.2) 522.14.1 Where there is a risk of danger due to the displacement of the building (CB3), the cable supports and protective devices used shall allow appropriate movement to protect the conductors and cables from excessive mechanical stress. 522.14.2 For movable or movable structures (CB4), a flexible wiring system shall be used. Note: See 522.7\ Vibration (AH)\, 522.8\ Other mechanical stresses (AL)\ and 522.12\ Earthquake effects (AP)\. 523 Flow
See IEC60364-5-523.
524 Conductor cross section
524.1 The cross section of each phase conductor in an AC circuit and the cross section of the live conductor in a DC circuit shall not be less than the values given in Table 52J. 524.2 In the following cases, the neutral conductor shall have the same cross section as the phase conductor. - Single-phase two-wire circuits regardless of the cross section: GB16895.6-2000
In multi-phase and single-phase three-wire circuits, the cross section of the phase conductor shall not be greater than 16 mm (copper) or 25 mm (aluminum). 524.3 In multi-phase circuits, the cross section of each phase conductor is greater than 16 mm (steel) or 25 mm (aluminum) and all of the following conditions are met, the neutral conductor area may be smaller than the phase conductor area.
In normal operation, the maximum current expected in the neutral conductor (including harmonic currents, if any) shall not be greater than the allowable current carrying capacity of the reduced neutral conductor cross section.
Note: In normal operation, the load current of each phase of the circuit should be evenly distributed. Neutral conductors shall be protected against overcurrent in accordance with 473.3.2 of IEC60364-4-473. - The cross-section of the neutral conductor shall not be less than 16mm (copper) or 25mm (aluminum). Table 52I Minimum cross-section of conductors
Wiring system type
Electrical system and insulated conductors
Flexible connection of insulated wires and cables
Line use
Power and lighting
Emergency
Signal and control circuits
Power (supply) circuits
Signal and control circuits
For specific electrical equipment
Any other purpose
Special-purpose extra-low voltage circuits
Terminals (or terminals) of aluminum conductors shall be tested and approved for such specific use. 2 The minimum conductor area allowed for signal and control lines used in electronic equipment is 0.1 mm\3 Note 2 also applies to multi-core cables with seven or more cores. 525 Voltage drop in user installations
Under consideration.
2.5 (see Note 1)
0.5 (see Note 2)
According to the relevant IEC publications
0.75 (see Note 3)
Note: If there are no other considerations, the actual voltage drop between the incoming line of the user's electrical installation and the equipment should not be greater than 4% of the rated voltage of the installation. Other considerations: including the starting time of motors and equipment with large inrush currents. Decompression conditions such as decompression voltage and voltage changes caused by misoperation can be ignored.
526 Electrical connections (see IEC61200-52)
526.1 The connections between conductors and between conductors and other electrical equipment should ensure electrical continuity and have appropriate mechanical strength and protection measures.
526.2 The selection of the connection method should reasonably consider the following factors: the conductor material of the wire and its insulation material: the shape and number of the core wires that make up the wire;
- the cross-section of the conductor:
- the number of wires to be connected,
Note: Welding connections should be avoided in power cables. If used, the thread change and mechanical strength of the joint must be considered (see 522.6, 522.7 and 522.8). 526.3 All joints should be easy to inspect, test and maintain, except for the following: Rationally laid cable joints;
Joints filled or sealed with composites!2 Where there are low-strength (AP2) or relatively remote ground records, special attention should be paid to the following points: - The way the wiring system is fixed to the building structure - Flexible connections should be used between fixed lines and all important equipment (such as security facilities). 522.13 Wind (AR) (see 321.14)
522.13.1 See 522.7 * Vibration (AH) * and 522.8 \ Other mechanical stress (AJ) 522.14 Building design (CB) (see 323.2) 522.14.1 Where there is a danger due to the displacement of the building (CB3), the cable supports and protective facilities used should allow corresponding movement to prevent the conductors and cables from being subjected to excessive mechanical stress. 522.14.2 Flexible wiring systems should be used for movable or movable structures (CB4). Note: See 522.7\Vibration (AH)\, 522.8\Other mechanical stresses (AL)\ and 522.12\Seismic effects (AP)\. 523 Current
See IEC60364-5-523.
524 Conductor cross section
524.1 The cross section of each phase conductor in an AC circuit and the cross section of the live conductor in a DC circuit shall not be less than the values given in Table 52J. 524.2 In the following cases, the neutral conductor shall have the same cross section as the phase conductor. - Single-phase two-wire circuits regardless of cross-section size: GB16895.6-2000
In multi-phase and single-phase three-wire circuits, the cross-section of the phase conductor shall not exceed 16 mm (copper) or 25 mm* (aluminum). 524.3 In multi-phase circuits, if the cross-section of each phase conductor is greater than 16 mm (steel) or 25 mm (aluminum) and all of the following conditions are met, the neutral conductor surface may be smaller than the phase conductor surface.
In normal operation, the expected maximum current of the neutral conductor (including harmonic current, if any) shall not exceed the allowable current carrying capacity of the reduced neutral conductor cross-section.
Note: In normal operation, the currents to be carried by each phase of the circuit should be evenly distributed. The neutral conductor shall be protected against overcurrent in accordance with 473.3.2 of IEC60364-4-473. - The cross-section of the neutral conductor shall not be less than 16 mm (copper) or 25 mm (aluminum). Table 52I Minimum conductor cross-section Wiring system type Electrical and insulated conductors Flexible connections for insulated conductors and cables Line use Power and lighting signal and control lines Power (power supply) lines Signal and control lines For specific electrical equipment Any other purpose Special purpose extra low voltage circuits Terminals (or terminals) of aluminum conductors shall be tested and approved for this specific use. 2 Signal and control lines for electronic equipment The minimum conductor cross-section allowed is 0.1 mm3 Note 2 also applies to multi-core cables with seven or more cores. 525 Voltage drop in user installations Under consideration.
2. 5 (see Note 1)
0. 5 (see Note 2)
According to the relevant IEC publications
0. 75 (see Note 3)
Note: If there are no other considerations, it is recommended that the actual voltage drop between the incoming line of the user's electrical installation and the equipment should not be greater than 4% of the rated voltage of the installation. Other considerations: including the starting time of motors and equipment with large inrush currents. Decompression conditions such as decompression voltage and voltage changes caused by misoperation can be ignored.
526 Electrical connections (see IEC61200-52)
526.1 The connections between conductors and between conductors and other electrical equipment should ensure electrical continuity and have appropriate mechanical strength and protection measures.
526.2 The selection of the connection method should reasonably consider the following factors: the conductor material of the wire and its insulation material: the shape and number of the core wires that make up the wire;
- the cross-section of the conductor:
- the number of wires to be connected,
Note: Welding connections should be avoided in power cables. If used, the thread change and mechanical strength of the joint must be considered (see 522.6, 522.7 and 522.8). 526.3 All joints should be easy to inspect, test and maintain, except for the following: Rationally laid cable joints;
Joints filled or sealed with composites!2 Where there are low-strength (AP2) or relatively remote ground records, special attention should be paid to the following points: - The way the wiring system is fixed to the building structure - Flexible connections should be used between fixed lines and all important equipment (such as security facilities). 522.13 Wind (AR) (see 321.14)
522.13.1 See 522.7 * Vibration (AH) * and 522.8 \ Other mechanical stress (AJ) 522.14 Building design (CB) (see 323.2) 522.14.1 Where there is a danger due to the displacement of the building (CB3), the cable supports and protective facilities used should allow corresponding movement to prevent the conductors and cables from being subjected to excessive mechanical stress. 522.14.2 Flexible wiring systems should be used for movable or movable structures (CB4). Note: See 522.7\Vibration (AH)\, 522.8\Other mechanical stresses (AL)\ and 522.12\Seismic effects (AP)\. 523 Current
See IEC60364-5-523.
524 Conductor cross section
524.1 The cross section of each phase conductor in an AC circuit and the cross section of the live conductor in a DC circuit shall not be less than the values given in Table 52J. 524.2 In the following cases, the neutral conductor shall have the same cross section as the phase conductor. - Single-phase two-wire circuits regardless of cross-section size: GB16895.6-2000
In multi-phase and single-phase three-wire circuits, the cross-section of the phase conductor shall not exceed 16 mm (copper) or 25 mm* (aluminum). 524.3 In multi-phase circuits, if the cross-section of each phase conductor is greater than 16 mm (steel) or 25 mm (aluminum) and all of the following conditions are met, the neutral conductor surface may be smaller than the phase conductor surface.
In normal operation, the expected maximum current of the neutral conductor (including harmonic current, if any) shall not exceed the allowable current carrying capacity of the reduced neutral conductor cross-section.
Note: In normal operation, the currents to be carried by each phase of the circuit should be evenly distributed. The neutral conductor shall be protected against overcurrent in accordance with 473.3.2 of IEC60364-4-473. - The cross-section of the neutral conductor shall not be less than 16 mm (copper) or 25 mm (aluminum). Table 52I Minimum conductor cross-section Wiring system type Electrical and insulated conductors Flexible connections for insulated conductors and cables Line use Power and lighting signal and control lines Power (power supply) lines Signal and control lines For specific electrical equipment Any other purpose Special purpose extra low voltage circuits Terminals (or terminals) of aluminum conductors shall be tested and approved for this specific use. 2 Signal and control lines for electronic equipment The minimum conductor cross-section allowed is 0.1 mm3 Note 2 also applies to multi-core cables with seven or more cores. 525 Voltage drop in user installations Under consideration.
2. 5 (see Note 1)
0. 5 (see Note 2)
According to the relevant IEC publications
0. 75 (see Note 3)
Note: If there are no other considerations, it is recommended that the actual voltage drop between the incoming line of the user's electrical installation and the equipment should not be greater than 4% of the rated voltage of the installation. Other considerations: including the starting time of motors and equipment with large inrush currents. Decompression conditions such as decompression voltage and voltage changes caused by misoperation can be ignored.
526 Electrical connections (see IEC61200-52)
526.1 The connections between conductors and between conductors and other electrical equipment should ensure electrical continuity and have appropriate mechanical strength and protection measures.
526.2 The selection of the connection method should reasonably consider the following factors: the conductor material of the wire and its insulation material: the shape and number of the core wires that make up the wire;
- the cross-section of the conductor:
- the number of wires to be connected,
Note: Welding connections should be avoided in power cables. If used, the thread change and mechanical strength of the joint must be considered (see 522.6, 522.7 and 522.8). 526.3 All joints should be easy to inspect, test and maintain, except for the following: Rationally laid cable joints;
Joints filled or sealed with composites!
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