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GOST 31947-2012

New standard for installation wires and cables

GOST 31947-2012 compared with GOST 6323-79 introduced the following new requirements:

  1. Wires with aluminum conductors are excluded. Conducting conductors are made only from copper wire (tinned and not tinned).
  2. Cables with a conductor core cross section of 0.75-50 mm² are included. The number of lived in the cables - 2,3,4,5.
  3. The range of conductor cores has been extended:
    • for single-core wires from 0.5 to 400 mm²;
    • two-, three-core wires from 0.75 to 4.0 mm².
  4. Conductive conductors for flexibility can be:
    • not requiring increased flexibility (1 class up to 10mm², 2 classes over 10mm²);
    • increased flexibility (grade 5).
  5. The design of stranded wires and cables should be as follows:
    • flat - for wires;
    • round - for cables.
  6. Main conductors, grounding conductors for wires and cables, and zero conductor cables must have the same cross section . Allowed in three-, four- and five-core cables with a nominal cross-section of the main conductors of 25mm2 and above, the grounding conductor of a smaller section in accordance with Table 3.
  7.   Table 3

    Name of the vein Nominal cross-section of the core, mm²
    Main vein 25 35 50
    Earth conductor sixteen sixteen 25
     
  8. A color marking system has been introduced for the purpose of identifying them (the preferred color scheme is shown in Table 4):
    • Coloring should be solid.
    • It is not recommended to use red and white colors.

      Table 4

    The number lived in the cable, pcs. Core insulation color Designated -
    niya
    Serial number of the core
    one 2 3 four five
    3 Korich-
    nevy
    The black Natural-
    ny
     
     
     
    Korich-
    new one
    Blue Green yellow  
     
    N, PE
    four Korich
    new one
    Black
    Natural-
    ny
    Blue  
    N
    Korich-
    new one
    Black
    Natural-
    ny
    Green yellow  
    PE
    five Korich
    new one
    Black
    Natural-
    ny
    Blue Green-yellow
    N, PE
    Korich-
    new one
    Black
    Natural-
    ny
    The black Blue N
     
  9. Compulsory presence of filling the outer gaps between the twisted insulated conductors, including in the form of an extruded inner sheath, to make the cables and wires almost round or flat.
    • The absence of a sheath in a single conductor is allowed.
    • The coloring of the shell is not normalized.
  10. A requirement has been introduced for a minimum mass of one meter of a conductive core, in order to exclude the possibility of supplying cables with a reduced cross-section of conductive cores
  11. The permissible current loads for wires and cables are given.
  12. Fire safety requirements have been entered. Low-risk fire cables and cables were introduced that do not emit corrosive-active products and with low toxicity.

Cable product designation:

Cables and wires are divided into the following features:

  1. by product type:
    • installation wire ( Pu );
    • installation cable ( Ku );
  2. by flexibility:
    • for installation and operation conditions that do not require increased flexibility ( without designation );
    • requiring increased flexibility ( G ),
  3. by type of insulation material and sheath:
    • polyvinyl chloride plastics, including low fire hazard and heat resistant ( B );
    • halogen free polymer compositions ( P ).
  4. for performance in terms of fire safety indicators:
    • non-flammable with single laying ( without designation );
    • non-flammable during group laying, with reduced smoke and gas emission - ng (A, B, C, D) -LS
    • non-propagating combustion in group laying, with reduced smoke and gas emission, with low toxicity of combustion products - ng (A, B, C, D) -LSLTx ;
    • non-flammable during group laying and not emitting corrosive gaseous products during combustion and smoldering - ng (A, B, C, D) -HF ;
    • non-propagating combustion during group laying and not emitting corrosive gaseous products during combustion and smoldering, with low toxicity of combustion products - ng (A, B, C, D) -HFLTx .

Examples of legend:

Installation wire that does not require increased flexibility with PVC insulation with one core with a nominal cross section of 2.5 mm², without a sheath - wire PuV 1 × 2.5
 
Installation cable requiring increased flexibility with PVC insulation and sheath, with reduced smoke and gas emission, does not propagate combustion in category A, with three main and zero conductors with a nominal cross section of 25 mm² and a ground conductor with a nominal cross section of 16 mm² - cable КУВВнг (A) -LS 4 × 25 (N) + 1 × 16 (PE)

 

  Table of new cable brand designations

Designation of wire and cable brands
TU 3500-022-59680632–2011 GOST 6323-79
Puv PW1
Pug PV2, PV3, PV4
Puvv PPV
Pugvv -
Kuvv -
CuGVV -
- Auto Recloser
- APPV
Puwng (A) -LS -
Pugvng (A) -LS -
PuVVng (A) -LS -
Pugvvng (A) -LS -
QuVWng (A) -LS -
KuGVVng (A) -LS -
PuPng (A) -HF -
PuGPng (A) -HF -
Puppng (A) -HF -
PuGPPng (A) -HF -
KuPPING (A) -HF -
CAPP (A) -HF -
 

 
 

  Predominant use of wires and cables

Mark Predominant scope
Puv For laying electrical wiring in steel pipes, boxes, trays, etc., for mounting electrical circuits
Pug The same for the installation of electrical circuits, where greater flexibility is required when laying and assembling
Puvv For laying electrical wiring under plaster, in concrete, masonry, in hollows of building structures, and also openly on the surface of walls and ceilings and in other structures, for mounting electrical circuits
Pugvv The same for the installation of electrical circuits, where greater flexibility is required when laying and assembling
Kuvv For laying in lighting networks, electrical wiring, installation and connection of household appliances, for laying electrical wiring under plaster, in concrete, masonry, in the voids of building structures, and also openly on the surface of walls and ceilings and in other structures, for mounting electrical circuits
CuGVV The same for the installation of electrical circuits, which require increased flexibility during installation and installation
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