Safety requirements for mining cable
1 Scope
This document specifies the classification and identification, technical requirements, inspection rules, transportation and storage requirements for mining cable, and describes the corresponding test methods.
This document is applicable to the design, manufacturing, testing, and laying of flexible rubber sheathed cables, power cables, control cables, and communication cables with a rated voltage U0/U of 8.7 kV/10 kV and below used in shaft coal mines, shaft metal and non-metal mines, and other occasions.
This document is not applicable to open-pit mining cables.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2900.10 Electrotechnical terminology - Electric cables
GB/T 3048.4 Test methods for electrical properties of electric cables and wires - Part 4: Test of DC resistance of conductors
GB/T 3048.5 Test methods for electrical properties of electric cables and wires - Part 5: Test of insulation resistance
GB/T 3048.8 Test methods for electrical properties of electric cables and wires - Part 8: AC voltage test
GB/T 3048.12 Test methods for electrical properties of electric cables and wires - Part 12: Partial discharge test
GB/T 3048.13 Test methods for electrical properties of electric cables and wires - Part 13: Impulse voltage test
GB/T 3956 Conductors of insulated cables
GB/T 7113.2-2014 Flexible insulating sleeving - Part 2: Methods of test
GB/T 12706.1-2020 Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) - Part 1: Cables for rated voltage of 1kV (Um=1.2kV) and 3kV (Um=3.6kV)
GB/T 17650.1 Test on gases evolved during combustion of materials from cables - Part 1: Determination of the amount of halogen acid gas
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 or optical fiber 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 1kW pre-mixed 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 19666-2019 General rules for flame retardant and fire resistant electric wires and cables or optical fiber cables
AQ/T 1043 Mining products safety label
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.10 and the following apply.
3.1
rated voltage
reference voltage for cable design, service and electrical performance test
Note: Rated voltage is expressed by U0/U, kV. U0 represents the voltage r.m.s. between any main insulated conductor and the "ground" (metallic shield, metallic sheath or surrounding medium); U represents the voltage r.m.s. between any two-phase conductors of multicore cable or single-core cable system.
3.2
low smoke
characteristic that smoke concentration produced by combustion will not reduce the visibility (light transmittance) to such an extent as to affect escape
[Source: GB/ T 19666-2019, 3.4]
3.3
halogen free
characteristic that the halogen (fluorine, chlorine, bromine, iodine) content of gas released during combustion is less than or equal to 1.0 mg/g
[Source: GB/T 19666-2019, 3.3]
3.4
low toxicity
characteristic that the toxicity and solubility of toxic smoke produced by combustion will not cause the death of living creature within 30 min
[Source: GB/T 19666-2019, 3.5]
4 Cable classification and identification
4.1 Cable classification
4.1.1 The cable classification based on application includes:
——Power cable: used in power grids of coal mines, metal mines and non-metal mines to transmit and distribute electric energy;
——flexible rubber sheathed cables: Used for power connection of mobile equipment, lighting and hand tools in coal mines, metal and non-metal mines;
——Control cable: used for transmitting control, measurement, and indication signals in electrical installations in coal mines, metal and non-metal mines;
——Communication cable: used to connect communication equipment in coal mines, metal and non-metal mines, for transmitting telephone, data, video and other Intrinsic safety electrical signal. Generally, it adopts twisted pair, star twisted pair or coaxial structure.
4.1.2 The cable classification based on materials includes:
——Halogenated cables;
——Halogen free cable.
4.1.3 The cable classification based on laying method includes:
——Movable cable;
——Fixed laying cables.
4.1.4 The cable classification based on voltage class includes:
——Low voltage cables, with rated voltage up to and including 0.66 kV/1.14 kV;
——High voltage cable, with rated voltage above and including 0.66 kV/1.14kV.
4.1.5 The classification and name of cables shall be specified in the product standard, and the classification code shall meet the requirements of Annex A.
4.2 Cable identification
4.2.1 Cable identification shall include at least the name of manufacturer, cable type, and specification information, and the identification method shall comply with product standards.
4.2.2 The surface of the cable shall be marked with safety signs, which shall meet the requirements of AQ/T 1043.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Cable classification and identification
5 Technical requirements
6 Test methods
7 Inspection rules
8 Transportation and storage
9 Laying and installation
Annex A (Normative) Classification and code of cables
Annex B (Normative) Transition resistance test
Annex C (Normative) Mechanical impact resistance test
Annex D (Normative) Compressive strength test
Annex E (Normative) Bending resistance test
Annex F (Normative) Test method for flexing and trailing resistance
Annex G (Normative) Combustion test under load condition
Annex H (Normative) Method for determination of lead and arsenic content in elements
