GB/T 19666-2019 in English

《GB/T 19666-2019阻燃和耐火电线电缆或光缆通则》由TC213（全国电线电缆标准化技术委员会）归口，主管部门为中国电器工业协会。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is developed in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 19666-2005 Flame retardant and fire resistant wires and cables — General. The following main technical changes have been made with respect to GB/T 19666-2005:

——Optical fiber cables have been added to the application scope (see Clause 1);

——The definition of "low toxicity" has been added (see 3.5);

——The clause "General" has been added (see Clause 4);

——The designation of codes N, NJ and NS have been modified (See Table 1; Table 1 in 2009 Edition);

——The combinations of burning behavior codes of halogen-free, low-smoke and low-toxicity flame retardant series and fire resistant series have been added (see 5.1.2);

——The assessment indicator and test method of flaming droplets have been added (see Table 4);

——The acceptance criteria that "the flaming burning time on the sample shall not exceed 1h after removing fire" has been deleted (see Table 4 of 2005 Edition);

——The acceptance criteria and test method of NJ and NS have been added (see Table 6);

——The acceptance criteria and test method of halogen acid gas release volume and halogen content in halogen-free properties have been added (see Table 7);

——The pH and conductivity weighted values for halogen-free properties have been modified (see Table 7; Table 6 of 2005 Edition);

——The note "The minimum light transmittance test results of electric wires and cables or optical fiber cables with an outer diameter greater than 80 mm shall be multiplied by a factor (d/80) as the final conclusion" has been added (see Table 8).

——The acceptance criteria and test method of low toxicity have been added (see 6.5);

——The technical requirements for halogen-free, low-smoke and low-toxicity flame retardant electric wires and cables and optical fiber cables have been added (see 7.1.3);

——"The properties of fire resistant mica tape may refer to Annex C to this standard" has been deleted. If the fire resistant layer is between conductor and insulator, the thickness of insulation layer may be reduced, but the thickness after reduction shall not be less than 80% of the original standard thickness "(see 6.4 of 2005 Edition);

——The nature and contents of Annex A have been modified (see Annex A; Annex A to 2005 Edition);

——The nature and contents of Annex B have been modified (see Annex B; Annex B to 2005 Edition);

——The nature and contents of Annex C have been modified (see Annex C; Annex C to 2005 Edition).

This standard was proposed by China Electrical Equipment Industry Association.

This standard is under the jurisdiction of National Technical Committee on Wires and Cables of Standardization Administration of China (SAC/TC 213).

The previous edition of this standard is as follows:

——GB/T 19666-2005.

General rules for flame retardant and fire resistant electric wires and cables or optical fiber cables

1 Scope

This standard specifies the burning behavior code, technical requirements, test methods and acceptance rules of flame retardant and fire resistant electric wires and cables or optical fiber cables, including the burning behavior of halogen-free, low smoke, low toxicity, flame retardance and fire resistance.

This standard is applicable to flame retardant and fire resistant electric wires and cables or optical fiber cables containing halogen, halogen-free or with low smoke or low toxicity.

2 Normative references

The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.

GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB/T 17650.1 Test on gases evolved during combustion of materials from cables or optical fiber cables — Part 1: Determination of the halogen acid gas content
GB/T 17650.2 Test on gases evolved during combustion of materials from cables or optical fiber cables — Part 2: Determination of acidity (by pH measurement) and conductivity
GB/T 17651.2 Measurement of smoke density of cables burning under defined conditions — Part 2: Test procedure and requirements
GB/T 18380.12 Tests on electric and optical fibre cables under fire conditions — Part 12: Test for vertical flame propagation for a single insulated wire or cable — Procedure for 1 kW pre-mixed flame
GB/T 18380.13 Tests on electric and optical fibre cables under fire conditions — Part 13: Test for vertical flame propagation for a single insulated wire or cable — Procedure for determination of flaming droplets/particles
GB/T 18380.22 Tests on electric and optical fibre cables under fire conditions — Part 22: Test for vertical flame propagation for a single small insulated wire or cable — Procedure for diffusion flame
GB/T 18380.33 Tests on electric and optical fibre cables under fire conditions — Part 33: Test for vertical flame spread of vertically-mounted bunched wires or cables — Category A
GB/T 18380.34 Tests on electric and optical fibre cables under fire conditions — Part 34: Test for vertical flame spread of vertically-mounted bunched wires or cables — Category B
GB/T 18380.35 Tests on electric and optical fibre cables under fire conditions — Part 35: Test for vertical flame spread of vertically-mounted bunched wires or cables — Category C
GB/T 18380.36 Tests on electric and optical fibre cables under fire conditions — Part 36: Test for vertical flame spread of vertically-mounted bunched wires or cables — Category D
GB/T 19216.21 Tests for electric cables under fire conditions — Circuit integrity — Part 21: Procedures and requirements — Cable of rated voltage up to and including 0.6/1.0 kV
GB/T 19216.23 Tests for electric cables under fire conditions — Circuit integrity — Part 23:Procedures and requirements — Electric data cables
GB/T 19216.25 Tests for electric cables under fire conditions — Circuit integrity — Part 25: Procedures and requirements — Optical fibre cables
IEC 60331-1 Tests for electric cables under fire conditions — Circuit integrity — Part 1: Test method for fire with shock at a temperature of at least 830°C for cables of rated voltage up to and including 0,6/1,0 kV and with an overall diameter exceeding 20 mm
IEC 60331-2 Tests for electric cables under fire conditions — Circuit integrity — Part 2: Test method for fire with shock at a temperature of at least 830°C for cables of rated voltage up to and including 0,6/1,0 kV and with an overall diameter not exceeding 20 mm
IEC 60684-2:2011 Flexible insulating sleeving — Part 2: Methods of test
IEC 60754-3 Test on gases evolved during combustion of materials from cables — Part 3: Measurement of low level of halogen content by ion chromatography

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply.

3.1
flame retardance
burning behavior that after a sample is burned under the specified conditions, the flame spread on the sample only within a limited range after the fire source is removed, i.e., burning behavior of a sample to prevent or delay the occurrence or spread of flame

3.2
fire resistance
burning behavior that a sample can operate continuously under specified conditions when it is burned on a specified fire source and in specific period

3.3
halogen free
burning behavior that the content of halogen (fluorine, chlorine, bromine and iodine) in the gases released from burning is less than or equal to 1.0 mg/g

3.4
low smoke
burning behavior that the concentration of smoke from burning will not reduce visibility (light transmittance) to the degree adversary to escape

3.5
low toxicity
burning behavior that the toxicity and concentration of toxic smoke from burning will not cause the death of living organisms within 30 min

4 General

The burning behavior of flame retardant and fire resistant electric wires and cables or optical fiber cables shall meet the requirements of this standard, and properties other than burning ones shall meet the relevant product standards.

Electric wires and cables or optical fiber cables may reduce their original basic properties while achieving the purpose of flame retardance and/or fire resistance, or make some original test methods inapplicable. The parties to agreements based on this standard shall discuss or negotiate an appropriate solution, which shall ensure the safety and reliability of electric wires and cables or optical fiber cables during use while achieving the purpose of flame retardance and/or fire resistance. On the premise of not compromising the safety and reliability during use, the corresponding technical indicators or test methods may be properly adjusted.

5 Product designation

5.1 Burning behavior codes and combinations

5.1.1 Burning behavior codes

See Table 1 for the burning behavior codes.
 
Table 1 Burning behavior codes
Code Designation
Z a Single flame retardance
ZA b Category A flame retardance
ZB Category B flame retardance
ZC Category C flame retardance
ZD Category D flame retardance
Halogen-containing
W Halogen-free
D Low smoke
U Low toxicity
N Resistance to fire only
NJ Resistance to fire with shock
NS Resistance to fire with shock and water jet
a For halogen-containing products, "Z" is omitted.
b This is only applicable to Category A of GB/T 18380.33, excluding Category AF/R of GB/T 18380.32.

5.1.2 Combination of burning behavior codes

See Table 2 for the combination of burning behavior codes for flame retardant series, and Table 3 for the combination of burning behavior codes for fire resistant series. When there are requirements for various burning behavior, the codes are arranged and combined in the order of halogen-free (the code for halogen-containing is omitted), low smoke, low toxicity, flame retardance and fire resistance.
 
Table 2 Combination of burning behavior codes for flame retardant series
Series Code Designation
Flame retardant series Halogen-containing ZA Category A flame retardance
ZB Category B flame retardance
ZC Category C flame retardance
ZD Category D flame retardance
Halogen-free and low-smoke WDZ Halogen-free low smoke and flame retardance of single cable
WDZA Halogen-free, low smoke and Category A flame retardance
WDZB Halogen-free, low smoke and Category B flame retardance
WDZC Halogen-free, low smoke and Category C flame retardance
WDZD Halogen-free low smoke and Category D flame retardance
Halogen-free, low smoke and low toxicity a WDUZ Halogen-free, low smoke, low toxicity and flame retardance of single cable
WDUZA Halogen-free, low smoke, low toxicity and Category A flame retardance
WDUZB Halogen-free, low smoke, low toxicity and Category B flame retardance
WDUZC Halogen-free, low smoke, low toxicity and Category C flame retardance
WDUZD Halogen-free, low smoke, low toxicity and Category D flame retardance
a This is optional based on the application occasion of electric wires and cables or optical fiber cables, which may include compacted space or crowded places with relatively closed environment.
 

Table 3 Combination of burning behavior codes for fire resistant series
Series Code Designation
Fire resistant series Halogen-containing N, NJ, NS Fire resistance
ZAN, ZANJ, ZANS Category A flame retardance and fire resistance
ZBN, ZBNJ, ZBNS Category B flame retardance and fire resistance
ZCN, ZCNJ, ZCNS Category C flame retardance and fire resistance
ZDN, ZDNJ, ZDNS Category D flame retardance and fire resistance
Halogen-free and low smoke WDZN, WDZNJ, WDZNS Halogen-free, low smoke, flame retardance and fire resistance of single cable
WDZAN, WDZANJ, WDZANS Halogen-free, low smoke, Category A flame retardance and fire resistance
WDZBN, WDZBNJ, WDBZNS Halogen-free, low smoke, Category B flame retardance and fire resistance
WDZCN, WDZCNJ, WDZCNS Halogen-free, low smoke, Category C flame retardance and fire resistance
WDZDN, WDZDNJ, WDZDNS Halogen-free, low smoke, Category D flame retardance and fire resistance
Halogen-free, low smoke and low toxicity a WDUZN, WDUZNJ, WDUZNS Halogen-free, low smoke, low toxicity, flame retardance and fire resistance of single cable
WDUZAN, WDUZANJ, WDUZANS Halogen-free, low smoke, low toxicity, Category A flame retardance and fire resistance
WDUZBN, WDUZBNJ, WDUBZNS Halogen-free, low smoke, low toxicity, Category B flame retardance and fire resistance
WDUZCN, WDUZCNJ, WDUZCNS Halogen-free, low smoke, low toxicity, Category C flame retardance and fire resistance
WDUZDN, WDUZDNJ, WDUZDNS Halogen-free, low smoke, low toxicity, Category D flame retardance and fire resistance
a This is optional based on the application occasion of electric wires and cables or optical fiber cables, which may include compacted space or crowded places with relatively closed environment.

5.2 Composition of product model

The model of flame retardant and fire resistant electric wires and cables or optical fiber cables consist of burning behavior codes and related wire, cable or optical fiber cable models, as shown in Figure 1.



Figure 1 Model composition of flame retardant and fire resistant electric wires and cables or optical fiber cables

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Product designation
5.1 Burning behavior codes and combinations
5.2 Composition of product model
5.3 Product representation method
6 Requirements of burning behavior
6.1 Flame retardance
6.2 Fire resistance
6.3 Halogen-free property
6.4 Low smoke
6.5 Low toxicity
7 Technical requirements
7.1 Flame retardant electric wire and cable or optical fiber cable series
7.2 Fire-resistant electric wires and cables or optical fiber cable series
8 Acceptance rules
Annex A (Normative) Water spray test method
Annex B (Normative) Water jet test method
Annex C (Normative) Toxicity index test method
Bibliography