Cables for coal mine -Part 5: Movable flexible cables of rated voltages up to and including 0.66/1.14kV
1 Scope
This part of MT 818 specifies the product classification and designation, technical requirements, test methods and acceptance rules of movable rubber-sheathed flexible cables with rated voltages of 0.38/0.66kV and 0.66/1.14kV for coal mines (hereinafter referred to as "cables").
This part is applicable to rubber-insulated rubber-sheathed flexible cables with rated voltages of 0.38/0.66kV and 0.66/1.14kV for movable equipment in coal mines.
2 Normative references
The following documents contain provisions which, through reference in this part of MT 818, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 7594.7-1987 Rubber insulation and sheath of electric cables and wires - Part 7: Heavy duty flame-retardant rubber sheath 65℃ (neq IEC 245)
GB/T 7594.8-1987 Rubber insulation and sheath of electric cables and wires - Part 8: Rubber sheath 90℃ (neq IEC 245)
MT 818.1-2009 Cables for coal mine - Part 1: General rules for movable flexible cables
3 Product classification and designation
3.1 Types
3.1.2 See Table 1 for the models of cables.
3.1.3 Cables may be classified into single-core cables and 4-core (3+1) cables according to the number of cores. The structure of 4-core cable is shown in Figure 1.
Table 1 Cable models
Model Name Purpose
MY-0.38/0.66 Movable rubber-sheathed flexible cable for coal mine Power supply connection of various underground movable coal mining equipment with rated voltage of 0.38/0.66kV
MYP-0.38/0.66 Movable rubber-sheathed flexible cable with screen for coal mine
MYP-0.66/1.14 Movable rubber-sheathed flexible cable with screen for coal mine Power supply connection of various underground movable coal mining equipment with rated voltage of 0.66/1.14kV
3.2 Specifications
The cable specifications shall meet those specified in Tables 2, 3 and 4. The nominal cross-sectional area of earth wire core conductor shall not be less than the specifications specified in Tables 3 and 4.
1-power wire core conductor; 2-filler; 3-insulation; 4-semi-conductive layer;
5-earth wire core conductor; 6-sheath
Figure 1
4 Technical requirements
4.1 Conductors
Foreword I
1 Scope
2 Normative references
3 Product classification and designation
4 Technical requirements
5 Test methods and inspection rules
