Cables for Coal Mine-Part 1: General Rules for Movable Flexible Cables
1 Scope
This Part of MT 818 specifies the naming, general requirements, inspection rules, marking, packaging, transportation and storage of movable rubber-sheathed flexible cables for coal mine (hereinafter referred to as cables).
This Part is applicable to the rubber-sheathed flexible cables of rated voltages up to and including 8.7/10 kV for coal mine.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Part of MT 818. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 2900.10 Electrotechnical vocabulary--Electric cables (GB/T 2900.10-2001, idt IEC 60050(461); 1984)
GB/T 2951.1 Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section one: Measurement of thickness and overall dimensions-Tests for determining the mechanical properties (GB/T 2951.1-1997, idt IEC 608ll-1-1; 1993)
GB/T 2951.2 Common test methods for insulating and sheathing materials of electric cables--Part 1: Methods for general application--Section two: Thermal ageing methods (GB/T 2951.2-1997, idt IEC 608ll-l-2: 1985)
GB/T 2951.5 Common test methods for insulating and sheathing materials of electric cables--Part 2: Methods specific to elastomeric compounds section one--Ozone resistance test--Hot set test--Mineral oil immersion test (GB/T 2951.5-1997, idt IEC 608111-2-l: 1986)
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 3048.8-2007, neq IEC 60060-1: 1989)
GB/T 3953-1983 Round copper wire for electrical purposes (GB/T 3953-1983, neq ASTM B1: 1970)
GB/T 3956-1997 Conductors of insulated cables (idt IEC 60228: 1978)
GB/T 4909.2 Test methods for bare wires-measurement of dimensions (GB/T 4909.2-1985, neq IEC 251: 1978)
GB/T 6995.3 Markings for electric wires and cables-part 3: identifications of cables and wires (GB/T 6995 3-1986, neq IEC60227: 1979)
AQ 1043 Mining products safety labels
JB/T 8137 Delivery drums for electric wires and cables
MT 386 Test Methods and Compliance of Flame Resistant Performance for Mining Cables
MT/T 775 Technical condition of dragging mode cable protected panel for coal winning machine
MT 818.2~MT 818.10 Cables for coal mine-Part 2 ~ Part 10
Safety Regulations in Coal Mine (2006 Edition)
3 Terms and Definitions
For the purpose of this Part, the terms and definitions established in GB/T 2900.10 and the following ones apply.
3.1
Rated voltage
The reference voltage for the cable design, selection and electrical property test
Note 1: rated voltage is represented in U0/U and its unit is KV. U0 represents the RMS voltage between any major insulation conductor and "ground" (metallic shield, metallic sheath or ambient medium); U is the RMS voltage between any two-phase conductor of multi-core cable or single-core cable system. In the AC system, the rated voltage of cable shall be at least equal to the nominal voltage of the system where the cable is used, which applies to both U0 and U. In the DC system, the standard voltage of this system shall not be greater than 1.5 times of the rated voltage of the cable. The working voltage of the system shall not be greater than 1.1 times of the rated voltage of system and shall meet the requirements of "Safety Regulations in Coal Mine".
Note 2: this definition is changed from definition 3.1.2 of GB 12972.1-1991.
3.2
Type test
The test conducted by the manufacturer before supplying a certain cables specified in the cable standard.
Note 1: these tests are of such a nature that, after they have been made, they need not be repeated unless changes are made in the cable materials, structures or processes that might change the performance characteristics, or unless otherwise specified, such as periodic test.
Note 2: this definition is changed from definition 3.2.3 of GB/T 12706.1-2002.
3.3
Sample test (s)
Tests made by the manufacturer on samples of completed cable or components taken from a completed cable according to the manufacture batch
Note: this definition is changed from definition 3.2.2 of GB/T 12706.1 - 2002.
3.4
Contents
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Product Naming
5 General Requirements
6 Test Methods
7 Inspection Rules
8 Marking
9 Packaging, Transportation and Storage
Appendix A (Normative) Tear Test Method
Appendix B (Informative) Current-Carrying Capacity of Movable Rubber-Sheathed Flexible Cable for Coal Mine
