Cables for Coal Mine-Part 2: Flexible Cables for Use with Coal Cutters of Rated Voltages Up to and Including 1.9/3.3 kV
1 Scope
This Part of MT 818 specifies the product classification, naming, technical requirements, test methods and inspection rules of flexible cables for use with coal cutters of rated voltages up to and including 1.9/3.3 kV (hereinafter referred to as cable).
This Part is applicable to the copper-core rubber sheathed flexible cables for use with coal cutters and similar equipments of rated voltages up to and including 1.9/3.3 kV.
2 Normative References
The following standards contain provisions which, through reference in this Part of MT 818, constitute provisions of this Part. 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 Part 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 7594.7-1987 Rubber insulation and sheath of electric cables and wires-Part 7:Heavy duty flame-retardant rubber sheath 65 Centigrade (neq IEC 245)
GB/T 7594.8-1987 Rubber insulation and sheath of electric cables and wires-Part 8: Rubber sheath 90 Centigrade (neq IEC 245)
MT 818.1-2009 Cables for coal mine—Part 1: General rules for movable flexible cables
3 Product Classification and Naming
3.1 Types
3.1.1 Cable models are detailed in Table 1.
Table 1 Cable Models
Model Name Application Structure
Type A Type B
MC-0.38/0.66 Rubber-sheathed flexible cables for coal cutters Power supply connection for the coal cutters and similar equipments of rated voltages up to and including 0.38/0.66 kV. √ —
MCP-0.38/0.66 Screening rubber-sheathed flexible cables for coal cutters Power supply connection for the coal cutters and similar equipments of rated voltages up to and including 0.38/0.66 kV. √ —
MCP-0.66/1.14 Screening rubber-sheathed flexible cables for coal cutters Power supply connection for the coal cutters and similar equipments of rated voltages up to and including 0.66/l.14 kV. √ √
MCP-1.9/3.3 Screening rubber-sheathed flexible cables for coal cutters Power supply connection for the coal cutters and similar equipments of rated voltages up to and including 1.9/3.3 kV √ √
3.1.2 As for the cables of rated voltage 0.38/0.66 KV, Type A structure as shown in Figure 1 shall be adopted; as for the cables of rated voltages up to and including 0.66/1.14 kV, Type A or Type B structure as shown in Figure 1 shall be adopted.
l——Power-core conductor;
2——Earth-wire-core conductor and semiconductive layer (extruded insulating layer of MC type cable);
3——Control core conductor;
4——Insulation;
5——Power-core semiconductive screening layer (no screening layer for MC type cables);
6——Outer sheath;
7——Inner sheath;
8——Strengthening layer.
