Low-voltage electrical installations part 5 52. Selection and installation of electrical wiring depending on external influences

04.03.2020

Goals and principles of standardization in Russian Federation installed federal law dated December 27, 2002 N 184-FZ "On technical regulation", and the rules for the application of national standards of the Russian Federation - GOST R 1.0-2004 "Standardization in the Russian Federation. Basic provisions"

1 PREPARED by the Moscow Institute for Energy Security and Energy Conservation (MIEE) on the basis of an authentic translation into Russian of the international standard specified in paragraph 4

4 This standard is identical to the international standard IEC 60364-5-52:2009 * "Low-voltage electrical installations - Part 5-52. Selection and installation of electrical equipment. Electrical wiring" (IEC 60364-5-52:2009 Low-voltage electrical installations - Part 5- 52: Selection and erection of electrical equipment - Wiring systems).

The title of this International Standard has been changed from the title of this International Standard to bring it into line with the newly adopted title of the IEC 60364 series of standards.

When applying this standard, it is recommended to use instead of the reference international standards the national standards of the Russian Federation corresponding to them (and the interstate standards acting in this capacity), information about which is given in the additional appendix DA.

Information about changes to this standard is published in the annually published information index "National Standards", and the text of changes and amendments - in the monthly indexes "National Standards". In case of revision (replacement) or cancellation of this standard, a corresponding notice will be published in the monthly published information index "National Standards". Relevant information, notification and texts are also placed in information system common use - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet

The referenced documents* listed below are indispensable for the application of this International Standard. For dated references, only the edition cited applies. normative document. For undated references, the latest edition of the relevant normative document applies.

IEC 60287 (all parts) Electrical cables. Calculation of the rated current (IEC 60287 (all parts), Electric cables - Calculation of the current rating)

IEC 60287-2-1 Electrical cables. Calculation of the rated current. Part 2-1. Thermal resistance. Thermal resistance calculation (IEC 60287-2-1, Electric cables - Calculation of the current rating - Part 2: Thermal resistance; section 1: Calculation of thermal resistance)

IEC 60287-3-1 Electrical cables. Calculation of the rated current. Part 3: Sections concerning operating conditions. IEC 60287-3-1, Electric cables - Calculation of the current rating - Part 3: Sections on operating conditions - Section 1: Reference operating conditions and selection of cable type

IEC 60332-1-1 Electrical and optical fiber cables. Fire tests. Part 1-1. Vertical flame spread for a single insulated wire or cable. Apparatus (IEC 60332-1-1, Tests on electric and optical fiber cables under fire conditions - Part 1-1: Test for vertical flame propagation for a single insulated wire or cable - Apparatus)

IEC 60332-1-2 Electrical and optical fiber cables. Fire tests. Part 1-2. Vertical flame spread for a single insulated wire or cable. Procedure for 1 kW premixed flame (IEC 60332-1-2, Tests on electric and optical fiber cables under fire conditions - Part 1-2: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame)

IEC 60364-1:2005 Low-voltage electrical installations in buildings. Part 1. Basic principles, assessment general characteristics, definitions (IEC 60364-1:2005, Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions)

IEC 60364-4-41:2005 Electrical installations in buildings. Part 4-41. Protection for security. Protection against electric shock (IEC 60364-4-41:2005, Low-voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock)

IEC 60364-4-42 Electrical installations of buildings. Part 4-42. Protection for security. Thermal protection (EC 60364-4-42, Low-voltage electrical installations - Part 4-42: Protection for safety - Protection against thermal effects)

IEC 60364-5-54 Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Earthing devices, protective bars and protective equipotential bars (IEC 60364-5-54, Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors)

IEC 60439-2 Switchgear and control gear, low voltage, complete. IEC 60439-2, Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)

IEC 60502 (all parts), Power cables with extruded insulation and cable accessories for rated voltages from 1 kV ( 1.2 kV) to 30 kV ( 36 kV) (IEC 60502 (all parts), Power cables with extruded insulation and their accessories for rated voltages from 1 kV ( 1.2 kV) up to 30 kV ( 36 kV))

GOST R 50571.15-97

(IEC 364-5-52-93)

UDC 696.6:006.354

Group E08

STATE STANDARD OF THE RUSSIAN FEDERATION

ELECTRICAL INSTALLATIONS OF BUILDINGS

PART 5

SELECTION AND INSTALLATION OF ELECTRICAL EQUIPMENT

CHAPTER 52

ELECTRICAL WIRING

Electrical installations of buildings. Part 5

Selection and erection of electrical equipment.

OKS 27.020; 29.020

Introduction date 1997-07-01

Foreword

1 DEVELOPED by Elektromontazh JSC

2 INTRODUCED by the Technical Committee for Standardization TC 337 “Electrical equipment of residential and public buildings”

4 This standard contains the complete authentic text of the international standard IEC 364-5-52 (1993) “Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Chapter 52. Wiring” with the exception of those in italics in paragraphs 522.1.1, 522.6.2, 522.7.1, 522.12.2. .Replaced in these clauses, the authentic text of IEC 364-5-52-93 is given in annex A to this standard.

The standard also contains Additional requirements, highlighted in italics in paragraphs 521.1 (note and text in table 52 P), 521.3 (for schemes 11, 11A, 12-17, 21, 31, 31A, 32, 32A, 51, 52, in table 52H), 522 (note 2), 525, 526.2, 527.1.1, 527.1.5, 527.2.4, 528.1.1

5 INTRODUCED FOR THE FIRST TIME

Introduction

This International Standard is part of a set state standards on electrical installations of buildings developed on the basis of the international standard IEC 364 “Electrical installations of buildings”.

The numbering system of sections and clauses in this standard corresponds to that established in IEC 364-5-52-93, therefore, in this standard, in the designation, for example, clause 521.1, the number 5 indicates the part number of the international standard IEC 364-5-52-93, the numbers 52 - chapter number, 521 - section number of the standard.

The use of the numbering system established by the IEC ensures the interconnection of the requirements of private standards of the complex of state standards for electrical installations of buildings (GOST R 50571).

The requirements of this standard should be taken into account when developing and revising standards, norms and rules for the device, testing, certification and operation of electrical installations of buildings.

The requirements regulated by the standard are determined by the type of wire or cable used, the method of their installation, laying, external influencing factors, conditions for limiting the spread of combustion, proximity to other engineering networks and structures, as well as the conditions for providing maintenance.

The scope of the standard is in accordance with GOST 50571.1 (part 1, section 1).

Due to the significant differences in the requirements for external influencing factors (WWF) adopted in Russia and the CIS from the requirements of the IEC and ISO standards, this standard additionally, and in a number of paragraphs and instead of the requirements of IEC 364-5-52-93, includes the requirements of domestic and interstate (CIS countries) standards.

All additions and changes made to the text of the standard are in italics, and the corresponding authentic text is given in Appendix A to this standard. Appendix B contains the main provisions for checking the resistance of the installed electrical wiring to the effects of special environments.

The standard contains a number of requirements and provisions that differ significantly from the requirements of the current Electrical Installation Rules (PUE). The most important of them are:

1 Insulated wires are allowed to be laid only in pipes, ducts and on insulators. It is not allowed to lay insulated wires hidden under plaster, in concrete, in brickwork, in voids building structures, as well as openly on the surface of walls and ceilings, on trays, on cables, and other structures. In this case, sheathed insulated wires or cables must be used.

2 In single- or three-phase networks, the cross section of the neutral working conductor and the PEN conductor must be equal to the cross section of the phase conductor with a cross section of 16 mm or less for conductors with a copper core and 25 mm or less for conductors with an aluminum core. For large sections of phase conductors, a reduction in the section of the zero working conductor is allowed, provided that:

The expected maximum operating current in the neutral conductor does not exceed its long-term permissible current;

The zero protective conductor is protected against overcurrent.

4 Increased requirements for sealing the passage of electrical wiring through walls and floors.

The introduced requirements increase the operational reliability, electrical and fire safety of electrical installations in buildings.

Until the PUE is brought into line with the IEC set of standards for electrical installations of buildings, the PUE is applied in terms of the requirements that do not contradict the specified set of standards.

1 AREA OF USE

This standard specifies requirements for the selection, installation and operation of electrical wiring.

The standard applies to electrical installations of power, lighting and secondary circuits with voltages up to 1000 V AC and 1200 V DC, performed inside buildings and structures, as well as on their outer walls and in their immediate vicinity using insulated wires and cables (GOST R 50571.1) .

2 REGULATORY REFERENCES

GOST 9.005-72 ESZKS. Metals, alloys, metallic and non-metallic inorganic coatings. Permissible and impermissible contacts with metals and non-metals

GOST 9.303-84 ESZKS. Metallic and non-metallic inorganic coatings. General selection requirements

GOST 12.1.004-91 SSBT. Fire safety. General requirements

GOST 12.1.010-76 SSBT. Explosion safety. General requirements

GOST 12.2.007.0-75 SSBT. Electrical products. General safety requirements

GOST 12176-89 Cables, wires and cords. Flame Propagation Test Methods

GOST 14254-96 Degrees of protection provided by enclosures (IP code)

GOST 15150-69 Machinery, instruments and others technical products. Versions for different climatic regions. Categories, conditions of operation, storage and transportation in terms of the impact of environmental climatic factors

GOST 15543.1-89 Electrical products. General requirements in terms of resistance to climatic external Inactive factors

GOST 15963-79 Electrical products for areas with a tropical climate. General technical requirements and test methods

GOST 17516.1-90 Electrical products. General requirements in terms of resistance to mechanical external influences

GOST 24682-81 Electrical products. General technical requirements regarding the impact of special environments

GOST 24683-81 Electrical products. Methods for monitoring resistance to special media

GOST 28668.1-91 Low-voltage distribution and control devices. Part 2. Particular requirements for busbar systems (busbars)

GOST R 50462-92 Identification of conductors by colors or numbers

GOST R 50571.1-93 Electrical installations of buildings. Key points

GOST R 50571.2-94 Electrical installations of buildings. Part 3. Key Features

GOST R 50571.8-94 Electrical installations of buildings. Part 4. Security requirements. General requirements for the application of protective measures to ensure safety. Requirements for the application of protective measures against electric shock

GOST R IEC 449-96 Electrical installations of buildings. Voltage ranges

52 GENERAL

52.1 When selecting and installing electrical wiring, the requirements of GOST R 50571.1 for cables and wires for their termination and / or connection, for their support or suspension structures, protective shells and methods of protection against external influences must be taken into account, as well as general safety requirements in accordance with GOST 50571.1 ( part 2).

NOTE The requirements of this International Standard also apply in general to protective conductors, while in the relevant private standards of the GOST 50571 set of standards, additional requirements are established for protective conductors.

521 Types of wiring

521.1 The method of installation of electrical wiring, depending on the type of wire or cable used, must be selected in accordance with table 52F, provided that the external influences on the wires or cables comply with the requirements of the current standards for these wires and cables.

521.2 The method of installation of electrical wiring, depending on the installation location, must comply with table 52G.

521.3 Examples of electrical wiring are given in table 52H.

NOTE - Other types of wiring not covered by this standard may be used only provided that they meet general requirements of this standard.

521.4 Busways

Bus ducts must meet the requirements of GOST 28668.1 and be mounted according to the manufacturer's instructions. At the same time, installation work is carried out in strict accordance with the requirements of sections 522 (except for clauses 522.1.1, 522.3.3, 522.8.1.6, 522.8.1.7 and 522.8.1.8), 525-528.

521.5 AC circuits Conductors enclosed in ferromagnetic sheaths shall be laid in such a way that all the conductors of each circuit are in the same sheath.

NOTE If this condition is not met, overheating of the wires and significant voltage losses due to the effect of inductance may occur.

Table 52F - Wiring Selection

Wires and cables		Mounting method
		without attachment	with direct attachment	in boxes	in special boxes	on patches and brackets	on insulators	on a cable (string)
bare wires
Insulated wires
Insulated wires in a protective sheath and cables in sheaths (including armored and mine-	stranded
ral insulation)	Single core

Designations: “+” - allowed;

"-" - not allowed;

Note - Special box - a box of rectangular section, designed for laying wires and cables, which does not have removable or opening covers.

Table 52G - Installation of electrical wiring systems

	Mounting method
gaskets	without attachment	with direct attachment	in boxes	in special boxes	on trays and brackets	on insulators	on a cable (string)
In the voids of building structures
in cable channels

In building structures
Open laying on building structures
In the air

Designations:

"-" - not allowed;

“0” - not used or usually not used in practice.

Notes

1 The numbers in the table indicate the reference number (see table 52H).

2 Permissible current loads - according to GOST R 50571 (IEC 364-5-523).

Table 52H - Installation examples

NOTE The illustrations do not give a precise description of the products or installation practices, but of the method of installation.

	Description	Reference number
	Insulated wires in pipes embedded in walls
	Multi-core cables in pipes embedded in walls
	Insulated wires in exposed pipes
	Single or multi-core cables in exposed pipes
	Insulated wires in special boxes on the walls
	Single or multi-core cables in special ducts on the walls
	Insulated wires in pipes in masonry
	Single or multi-core cables in pipes in masonry
	sheathed and/or armored cables, solid or stranded:
	On the wall
	On the ceiling
	On non-perforated trays
	On perforated trays
	On brackets mounted horizontally or vertically
	On clicks
	On ladder trays
	Sheathed insulated wires, sheathed cables, single or stranded, suspended on a cable ( string) or having a carrying cable ( string)
	Bare or insulated wires on insulators
	Sheathed insulated wires, single or multi-core sheathed cables in the voids of building structures
	Insulated wires in pipes in the voids of building structures
	Single or multi-core cables in pipes in the voids of building structures
	Insulated wires in special boxes in the voids of building structures
	Single or multi-core cables in special boxes in the voids of building structures
	Insulated wires in special boxes in masonry
	Single or stranded cables in special masonry boxes
	Sheathed single or stranded cables:
	Laid in the voids of the ceiling In double floors
	insulated wires, single or stranded cables in ducts on the wall:
	Laid horizontally
	Laid vertically
	Insulated wires in boxes recessed flush into walls or floors
	Single or stranded cables in ducts recessed flush into walls or floors
	Insulated wires in suspended boxes
	Single or stranded cables in suspended boxes
	Insulated wires in pipes laid in horizontal or vertical closed cable ducts
	Insulated wires in pipes in ventilated cable ducts in floors
	Sheathed cables, solid or stranded, in horizontal or vertical open or ventilated cable ducts
	Sheathed insulated wires, sheathed cables, stranded, embedded directly into walls
	Sheathed insulated wires, sheathed cables, solid or stranded, embedded directly in the masonry:


	Sheathed cables, single or multi-core, in pipes or in special ducts in the ground
	Sheathed cables, solid or stranded in the ground:
	Without additional mechanical protection
	With additional mechanical protection
	Insulated wires and cables in cornices
	Insulated wires and cables in plinth boxes * Place for communication cables and computer networks
	Insulated wires in pipes or sheathed cables, solid or stranded, laid:
	In door frames
	In window frames
	Sheathed cables, solid or stranded, laid in water

521.6 Wiring in pipes and ducts

It is permitted to lay several circuits in the same conduit or conduit, provided that all wires are insulated for the highest rated voltage of the circuits laid in this conduit or conduit.

522 Selection and installation of electrical wiring depending on external influences

Notes

1 This section considers only those of the external influences specified in GOST R 50571.2, which significantly affect the wiring.

2 Specific operating conditions for electrical wiring in terms of the impact of external climatic factors (VVF) are established in accordance with GOST 15150 and GOST 15543.1 in accordance with one of the types of climatic modification specified in 321 GOST R 50571.2.

522.1 Temperature environment(321.1 GOST R 50571.2)

522.1.1 The selection and installation of electrical wiring must be made in such a way that it is suitable for operation at the highest local ambient temperature in accordance with 5.4 and 5.5 of GOST 15150.

In this case, the upper and lower temperatures during the operation of the electrical wiring must be set in accordance with Appendix 4 of GOST 15543.1.

522.1.2 The various wiring components, including cables and all accessories, shall only be installed at temperatures specified in the relevant type-specific standards or supplied by the manufacturer. according to 1.3 of Appendix 4 of GOST 15543.1.

522.2 External heat sources

522.2.1 To protect electrical wiring from heating by external heat sources, one of the following or other methods of equal effectiveness shall be used:

Shielding;

Removal of electrical wiring from heat sources at a sufficient distance;

Selection of electrical wiring, taking into account the additional temperature rise that may occur;

Local reinforcement of the insulation or replacement of the insulation material. If it is not possible to eliminate additional heating by the above methods, correction factors for the temperature of the soil, water or air are applied, taking into account section 3 of Appendix 3 of GOST 15543.1.

Note - Heat from external sources can be transmitted by radiation, convection or heat conduction:

From hot water systems;

From appliances and lamps;

As a result of the technological process;

Through heat-conducting materials;

From radiation from the sun or the environment.

522.3 Presence of water (321.4 GOST R 50571.2)

522.3.1 Electrical wiring should be selected and installed so that water ingress will not cause damage. The installed electrical wiring must have an IP degree of protection corresponding to its location.

Notes

NOTE 1 In principle, intact sheaths and cable insulation in fixed installations can be considered sufficient protection against the ingress of moisture. Cables subject to frequent splashing, flooding or immersion in water require special consideration.

2 Damage to electrical wiring should be understood as electrical breakdown of insulation and mechanical damage to its shells or insulation.

522.3.2 Provision should be made for the removal of water or condensate where it may accumulate.

522.3.3 Where electrical wiring may be exposed to waves (AD6), its protection against mechanical damage must be ensured by one or more of the methods provided for in paragraphs 522.6, 522.7 and 522.8.

522.4 Presence of external solid bodies (321.5 GOST R 50571.2)

522.4.1 Wiring should be selected and installed in such a way as to minimize the risk of ingress of foreign solid particles. The installed electrical wiring must have an IP degree of protection corresponding to its location.

522.4.2 Where there is a significant amount of dust (AE4), additional measures should be taken to prevent the accumulation of dust or other particles in quantities that could adversely affect the processes of heat removal from the wiring.

NOTE It may be necessary to use a type of wiring that facilitates the removal of dust (see section 529).

522.5 Exposure to corrosive and polluting substances (321.6 GOST R 50571.2)

522.5.1 Where the presence of corrosive or contaminating substances, including water, may cause corrosion or deterioration of electrical wiring, parts of the wiring that may be damaged shall be suitably protected or made of materials resistant to such substances.

NOTE Acceptable means of additional protection during installation work may be protective tapes, paints or lubricants.

522.5.2 Contact of dissimilar metals causing electrolytic processes should be avoided unless special measures are taken to prevent the consequences of such contact.

522.5.3 Materials liable to cause mutual or individual deterioration in their quality shall not be in contact with each other.

522.6 Impacts (321.7.1 GOST R 50571.2)

522.6.1 Wiring should be selected and installed so as to minimize damage from mechanical external influences.

522.6.2 In fixed installations which may be subjected to the shocks specified for conditions M43 during operation, adequate protection may be provided:

- mechanical characteristics of electrical wiring or

The choice of its location, or

By additional local or general mechanical protection, or

A combination of the above methods.

522.7 Vibration (321.7.2 GOST R 50571.2)

522.7.1 Wiring laid on the structures of equipment subject to vibration of medium or high hardness (M5, M6, M43 GOST 17516.1) or fixed on them must comply with these conditions. This is especially true for cables and their connections.

NOTE Particular attention must be paid to connecting electrical wiring to vibrating equipment. Local measures such as flexible electrical wiring may be used for this.

522.8 Other mechanical effects

522.8.1 Electrical wiring must be selected and installed in such a way as to prevent damage to the sheath and insulation of cables or insulated conductors, as well as their connections during installation and operation.

522.8.1.1 For concealed wiring in building structures, pipes or special cable ducts shall be fully assembled for each circuit before insulated wires or cables are tightened into them.

522.8.1.2 The bending radius of wires and cables shall be such as not to damage them.

522.8.1.3 When laying wires and cables on supporting structures with support at a certain distance, the latter must be such as to prevent damage to wires and cables from its own weight.

522.8.1.4 For locations where the wiring is subjected to a constant (e.g. tensile load in vertical sections of the route from its own weight), the appropriate type of cable or conductor of the required cross section and method of installation should be selected so as to prevent damage to the conductors and cables from their own weight.

522.8.1.5 Wiring in which the pulling in and out of wires or cables is intended shall be provided with appropriate means of access to carry out such an operation.

522.8.1.6 Electrical wiring in floors shall be adequately protected to prevent damage during normal use of the floor.

522.8.1.7 Wiring, rigidly fixed and embedded in the walls, must be located horizontally, vertically or parallel to the edges of the walls of the room.

Electrical wiring laid in building structures without fastening can be located along the shortest path.

522.8.1.8 Flexible wiring shall be installed in such a way that excessive tensile forces are not applied to the wires and connections.

522.9 Presence of flora and/or mold (321.8 GOST R 50571.2)

522.9.1 In places where such a danger exists or may occur (AK2), an appropriate type of electrical wiring should be selected or special protective measures should be taken.

NOTE It may be necessary to apply a method of installation that allows the removal of growing vegetation or mold (see section 529).

522.10 Presence of fauna (321.9 GOST R 50571.2)

522.10.1 For locations where such a hazard exists or can be expected, the appropriate type of wiring must be selected or special protective measures provided, for example:

Selection of electrical wiring with appropriate mechanical characteristics or

Choosing an appropriate location, or

Application of additional local or general mechanical protection, or

A combination of the above methods.

522.11 Solar radiation (321.11A GOST R 50571.2)

522.11.1 In places where there is significant solar radiation, the appropriate type of wiring should be selected for these conditions or the necessary shielding should be provided.

NOTE See also 522.2.1 regarding elevated temperature.

522.12 The impact of seismic factors (321.12 GOST R 50571.2)

522.12.1 When selecting and installing electrical wiring, the seismic hazard of the installation site should be taken into account.

522.12.2 Where there is a risk of seismic action, particular attention shall be given to:

- fastening electrical wiring to the building structures of buildings, taking into account the mechanical impact on the electrical wiring during the most unfavorable (from seismic vibrations with accelerations according to Annex 6 of GOST 17516.1) mutual movements of building elements;

Connections of fixed electrical wiring to the main equipment. For example, for security systems, an appropriate degree of flexibility in connection of electrical wiring must be provided.

522.13 Air movement (321.14 GOST R 50571.2)

522.13.1 See paragraphs 522.7 and 522.8.

522.14 Building structure (CB1, CB2, CB3, CB4) (323.2 GOST R 50571.2)

522.14.1 Where building structures can move relative to each other (CB3), the fastening of wires and cables and their mechanical protection should allow such a relative displacement that does not subject the wires and cables to excessive mechanical stress.

522.14.2 In buildings with flexible or unstable structures (CB4), flexible electrical wiring should be used.

Note - See paragraphs 522.7, 522.8, 522.12.

523 Permissible current loads (GOST R 50571.2, IEC 364-5-523)

524 Conductor cross-sections

524.1 The cross sections of phase conductors in a.c. circuits and current-carrying conductors in direct current circuits shall not be less than the values specified in table 52J.

524.2 The cross section of the neutral conductor and the PEN conductor, if any, shall be the same as that of the phase conductors:

In single-phase two-wire circuits, regardless of the section;

In multi- and single-phase three-wire circuits with a cross section of phase conductors less than or equal to 16 mm for copper and 25 mm for aluminum conductors.

524.3 In multi-phase circuits in which the cross section of each phase conductor exceeds 16 mm 2 for copper and 25 mm 2 for aluminum conductors, the neutral conductor may have a smaller cross section than the phase conductors, while simultaneously fulfilling the following conditions:

The expected maximum current, including harmonics, if any, in the neutral conductor during normal operation does not exceed the current carrying capacity for the reduced section of the neutral conductor.

NOTE The load on the circuit during all normal use should be distributed almost evenly between the phases;

The neutral conductor is protected from overcurrents in accordance with the requirements of 473.3.2 GOST R 50571.8;

The cross section of the neutral conductor and the PEN conductor is at least 16 mm for copper and 25 mm for aluminum conductors.

Table 52J - Minimum conductor sizes

Wiring types		Purpose	Conductor
				Section, mm
	Cables and insulated conductors	Power and lighting circuits	aluminum	2.5 (see note 1)
Stationary electrical				0.5 (see note 2)
installations	Bare conductors	Power circuits	aluminum
		Signaling and control circuits
Flexible connections with insulated		Internal installation in devices and devices		According to the norms and requirements of the relevant standards
conductors and cables		In other cases		0.75 (see note 3)
		In extra-low voltage circuits for special applications

Notes

NOTE 1 Terminations used to terminate aluminum conductors shall be tested and designed for this purpose.

2 For signaling and control circuits intended for electronic equipment, the minimum allowable cross-sectional size of conductors is 0.1 mm

3 Note 2 also applies to multicore flexible cables having seven or more cores.

525 Voltage losses in electrical installations of buildings

Note - Voltage losses in electrical installations of buildings should not exceed 4% of the rated voltage of the installation. Temporary conditions such as transients and voltage fluctuations, caused by incorrect (erroneous) switching, are not taken into account.

526 Electrical connections

526.1 Connections of conductors to each other, as well as their connection to the equipment, must ensure the constant electrical conductivity of the circuit and adequate mechanical strength and protection.

526.2 In choosing the method of connection, the following shall be considered accordingly:

Conductor material and insulation;

The number and shape of the wires that form the conductor;

Conductor cross section;

The number of conductors that will be connected together;

- environmental conditions and areas of premises for explosion and fire hazard.

NOTE Soldering of power conductor connections should be avoided. However, if such connections are used, they should be made taking into account possible displacements and mechanical effects (see paragraphs 522.6-522.8).

526.3 All connections shall be accessible for their inspection, testing and maintenance, except for the following connections:

Cable connections in the ground;

Connections filled with compound or sealed;

Connections of cold ends to heating elements of floor and ceiling heating systems.

526.4 Where necessary, care shall be taken to ensure that the temperature of the connections during normal use does not impair the insulation of the conductors connected to or supporting them.

527 Selection and installation of electrical wiring under the conditions of limiting the spread of combustion

527.1 Precautions within a separate space enclosed by fire-resistant building structures

527.1.1 The risk of fire propagation can be reduced by selecting appropriate materials and mounting methods in accordance with requirements of GOST 12.1.004, GOST 12.2.007.0, GOST 12176 and the requirements set out in paragraph 522 of this standard.

527.1.2 Installation of electrical wiring should not reduce the performance of building structures and fire safety.

527.1.3 Cables and other wiring elements that have the necessary fire resistance specified in the relevant standards may be used without any additional precautions.

NOTE In electrical installations where there are special fire hazard conditions, it may be necessary to use special types of wires and cables.

527.1.4 The use of cables that do not meet at least the requirements of the standards for limiting their ability to spread fire should be limited to small lengths for connecting electrical appliances to permanent electrical wiring networks and in any case should not be allowed between rooms separated by fireproof partitions.

527.1.5 Wiring elements, other than cables, that do not at least meet the requirements of the relevant standards for flame propagation, but otherwise comply with the requirements of the standards, must be completely enclosed in non-combustible materials or protected (covered, painted) with non-combustible materials.

527.2 Sealing of wiring passages

527.2.1 When electrical wiring passes through structural elements of buildings and structures, such as floors, walls, roofs, ceilings, partitions, the fire resistance of which is determined by the project, the remaining holes must be sealed with a degree of fire resistance equal to the fire resistance of the corresponding elements of building structures.

527.2.2 Electrical wiring made in pipes, special channels, ducts, busbars or busbars that pass through structural elements of buildings with established fire resistance must have an internal seal that provides the same fire resistance as the corresponding building structural elements. Likewise, they must be sealed from the outside, as required by paragraph 527.2.1.

527.2.3 The requirements of 527.2.1 and 527.2.2 are considered satisfactory if the wiring seal has been type tested.

527.2.4 Wiring in pipes and conduits, in which materials are used that comply with the requirements of the fire propagation standard and have a maximum internal section of 710 mm, may not be sealed from the inside, provided that:

Wiring has a degree of protection not lower than IP33;

Any termination of the electrical wiring has a degree of protection not lower than IP33.

527.2.5 No electrical wiring may pass through the structural members of a building if the integrity of those structural members of the building cannot be ensured after the installation of the electrical wiring.

527.2.6 Seals made in accordance with the requirements of 527.2.1 and 527.2.3 shall comply with the requirements of 527.3 and the notes below.

Notes

1 These requirements can be classified as material standards if such standards are developed:

The materials used must be compatible with the electrical wiring materials with which they are in contact;

They must allow thermal movement of electrical wiring elements without compromising the quality of the seal;

They must have adequate mechanical strength to withstand the stresses that may result from damage to the supporting structures of electrical wiring as a result of a fire.

2 Compliance with the requirements of this subclause can be ensured if:

The fastening or supporting structures of the cables are located within 750 mm of the pressure seal and are capable of withstanding the mechanical loads expected in the event of a fire failure of the cable fasteners from the fire side so that the seal is not subjected to additional stress;

Or the design of the sealing device itself provides its necessary strength.

527.3 External influences

527.3.1 Seals designed to meet the requirements of 527.2.1 and 572.2.2 shall withstand external influences to the same extent as the wiring itself for which they are used, and, in addition, they shall meet the following requirements:

Withstand the impact of combustion products with the same degree calculated for structural elements of buildings through which electrical wiring passes;

Provide the same degree of protection against water penetration required from the structural elements of the buildings in which they are made;

The electrical wiring seal must be protected from water running along the electrical wiring or collecting around the seal, unless the materials used for the seal are waterproof.

527.4 Mounting conditions

527.4.1 Temporary sealing may be required for electrical wiring.

527.4.2 During wiring work, the seal must be repaired as soon as possible.

527.5 Inspection and testing

527.5.1 Seals shall be checked to ensure that they are made in accordance with the installation instructions.

527.5.2 After this verification, no further tests are required.

528 Rapprochement with other engineering networks

528.1 Proximity to electrical networks

528.1.1 Electrical circuits with voltage rangesIandIIaccording to GOST R IEC 449-96 must not be in the same wiring unless each cable has insulation rated for the maximum voltage present in that wiring, or if at least one of the following conditions is not met:

Each conductor of a multi-core cable is insulated for the maximum voltage in the cable or

Cables with insulation for different voltages are mounted in separate sections of special cable channels or ducts, or - laying in different pipes is used.

NOTE Special consideration may need to be given to the possible effects of electromagnetic and electrostatic interference on communication lines, computer networks, and the like.

528.2 Proximity to non-electric networks

528.2.1 Wiring should not be installed near sources of heat, smoke, or steam that may adversely affect them, unless they are protected from such influence by appropriate shielding to prevent heat from being removed from them.

528.2.2 In places where electrical wiring runs under networks subject to condensation (such as water, steam or gas networks), measures should be taken to protect the electrical wiring from their harmful effects.

528.2.3 Where Electricity of the net located near non-electrical networks, they must be located so that any intended operation on these networks would not harm the electrical networks and vice versa.

Note - This can be achieved:

Placement of networks at a sufficient distance from each other;

Using mechanical and thermal shielding.

528.2.4 Where electrical networks are located close to other networks, the following conditions must be met:

Electrical wiring must be well protected from the harmful effects of other networks during their normal operation;

Protection against indirect contact must be provided in accordance with the requirements of GOST R 50571.3, while non-electric metallic networks should be considered as third-party conductive parts.

529 Selection and installation according to maintenance conditions, including cleaning

529.1 The selection and installation of electrical wiring should take into account the knowledge and experience of the people who are expected to maintain the system.

529.2 If it is necessary to remove protective equipment for repair or maintenance, ensure that they are immediately restored to their original condition.

529.3 Safe and convenient access to all electrical wiring items that may require maintenance or repair should be provided.

Note - In some cases, it is necessary to provide means of permanent access to electrical wiring in the form of ladders, bridges, etc.

APPENDIX A

(reference)

AUTHENTIC TEXT OF ITEMS (PARAGRAPHS) OF IEC 364-5-52-93, THE REQUIREMENTS FOR WHICH ARE REFINED IN THIS STANDARD

The authentic text of clauses (paragraphs) of IEC 364-5-52-93, for which changes have been made to the corresponding clauses of this standard, are given in Table A. 1.

Table A1

Section number, paragraph (paragraph)		Authentic IEC 364-5-52 text
this standard
		522.1.1 The selection and installation of electrical wiring is carried out taking into account the highest values of ambient temperature. However, the temperature limit specified in Table 52A of IEC Publication 523 shall not be exceeded (clauses and subclauses of IEC Publication 321 and IEC 323 are given in IEC 364-3)
522.6.2 (first paragraph)	522.6.2 (first paragraph)	522.6.2 In fixed installations which may be subjected to moderate (AG2) or severe (AG3) impacts during operation, adequate protection may be provided.
522.7.1 (first paragraph)	522.7.1 (first paragraph)	522.7.1 Wiring connected to or attached to equipment subject to medium (AH2) or high vibration (AH3) shall comply with these conditions.
		522.12.2 In places with reduced (AP2) or increased seismic hazard, special attention must be paid to: Fixing electrical wiring to building structures; Connections of fixed electrical wiring with all nodes of the main equipment, i.e. ensuring the flexibility of these connections.

APPENDIX B

GUIDELINES FOR VERIFICATION OF WIRING RESISTANCE TO SPECIAL ENVIRONMENTS

The following provisions apply for preliminary verification of the conformity of the resistance of electrical wiring with the requirements for operation in conditions of exposure to special environments (see 522.5):

B1 The assessment of the resistance of electrical wiring is carried out at the stage of research and development work on the development of its typical units (which corresponds to acceptance or preliminary tests in accordance with GOST 16504).

B2 The resistance of electrical wiring elements according to 522.1.2 can be verified by tests in accordance with GOST 24683.

B3 If it is required to check the electrical wiring by testing according to the GOST 24683 modes, then the mock-ups or its individual critical nodes in full size are subjected to tests.

B4 The test of electrical wiring according to paragraph B3 is not carried out if the elements included in it meet the requirements of 522.5.1 and 522.5.2, and design features it is such that the connection of the elements in the system does not change the parameters of the elements or the wiring as a whole in terms of resistance to special media.

B5 It is allowed not to test the electrical wiring according to paragraph B3, if the requirements of paragraphs B. 5.1 and B. 5.2 are met:

B. 5.1 Wiring is designed for operation in gas and vapor environments of group 5 according to GOST 24682 with effective values of their concentration less than 0.4 MPC (and forSO 2 , H 2 SO 4 , CO 2 - 0.8 MPC), while the resistance of electrical wiring can be guaranteed by the use of resistant materials and coatings in accordance with GOST 9.303.

B. 5.2 The impact of special environments on electrical wiring under operating conditions will occur for half or less of its established service life.

Keywords: electrical installations of buildings; choice of electrical equipment; installation of electrical equipment; electrical wiring; lighting and secondary networks; busbars; AC circuits; installation method; the wire; cable; permissible current loads; cross-sections of conductors; voltage loss; electrical connections; sealing of electrical wiring passages; proximity to electrical networks

Foreword

The goals and principles of standardization in the Russian Federation are established by the Federal Law of December 27, 2002 N 184-FZ “On Technical Regulation”, and the rules for the application of national standards of the Russian Federation are “Standardization in the Russian Federation. Basic Provisions".

PREPARED by the Moscow Institute for Energy Security and Energy Conservation (MIEE) on the basis of an authentic translation into Russian of the international standard specified in paragraph 4.
INTRODUCED by the Technical Committee for Standardization TK 337 "Electrical Installations of Buildings".
APPROVED AND INTRODUCED BY Order of the Federal Agency for Technical Regulation and Metrology dated December 13, 2011 N 925-st.
This standard is identical to the international standard IEC 60364-5-52:2009 “Low-voltage electrical installations. Part 5-52. Selection and installation of electrical equipment. Wiring” (IEC 60364-5-52:2009 Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems).

The title of this International Standard has been changed from the title of this International Standard to bring it into line with the newly adopted title of the IEC 60364 series of standards.

When applying this standard, it is recommended to use instead of reference international standards the corresponding national standards of the Russian Federation (and interstate standards acting in this capacity), information about which is given in the additional appendix DA.

IN PLACE (IEC 6064-5-52-93).

Information about changes to this standard is published in the annually published information index "National Standards", and the text of changes and amendments - in the monthly published indexes "National Standards". In case of revision (replacement) or cancellation of this standard, a corresponding notice will be published in the monthly published information index "National Standards". Relevant information, notification and texts are also posted in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet.

520.1 Scope

This standard specifies requirements for the selection and installation of electrical wiring.

NOTE The provisions of this standard apply to protective conductors.

520.2 Normative references

The referenced documents listed below are indispensable for the application of this International Standard. For dated references, only the edition cited of the relevant normative document applies. For undated references, the latest edition of the relevant normative document applies.

IEC 60228, Conductors of insulated cables.

IEC 60287 (all parts) Electrical cables. Calculation of the rated current (IEC 60287 (all parts), Electric cables - Calculation of the current rating).

IEC 60364-1:2005 Low-voltage electrical installations in buildings. IEC 60364-1:2005, Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions

IEC 60364-5-54 Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Grounding devices, protective bridges and protective equipotential bridges (IEC 60364-5-54, Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment Earthing arrangements and protective conductors).

IEC 60439-2 Switchgear and control gear, low voltage, complete. Part 2: Particular requirements for busbar trunking systems (busways) (IEC 60439-2, Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)).

IEC 60449 Electrical installations in buildings. Voltage bands (IEC 60449, Voltage bands for electrical installiatons of buildings).

EK 60502 (all parts) Power cables with extruded insulation and cable accessories for rated voltage from 1 kV (U m =1.2 kV) to 30 kV (U m =36 kV) (IEC 60502 (all parts), Power cables with extruded insulation and their accessories for rated voltages from 1 kV (U m =1.2 kV) up to 30 kV (U m =36 kV)).

IEC 60529 Degrees of protection provided by enclosures (IP code)

IEC 60570 Electrical supply track systems for luminaires (IEC 60570, Electrical supply track systems for luminaires).

IEC 60702 (all parts), Mineral insulated cables and their terminations with a rated voltage not exceeding 750 V.

IEC 60947-7 (all parts 7) Switchgear and control gear, low voltage. Part 7: Ancillary equipment (IEC 60947-7 (all parts 7), Low-voltage switchgear and controlgear; part 7: ancillary equipment).

IEC 60998 (all parts), Connecting devices for low-voltage circuits for household and similar purposes.

IEC 61084 (all parts), Cable trunking and ducting systems for electrical installations.

IEC 61386 (all parts), Conduit systems for cable management.

IEC 61534 (all parts), Busbar systems (IEC 61534 (all parts), Powertrack systems).

IEC 61537 Cabling organization. Cable ladder systems and cable ladder systems (IEC 61537, Cable management - Cable tray systems and cable ladder systems).

ISO 834 (all parts) Fire tests. Elements of building structures (ISO 834 (all parts), Fire-resistance tests; Elements of building construction).

Key words: low-voltage electrical installations, low-voltage electrical installations gost, installation of electrical equipment, electrical wiring, electrical wiring gost.