(1) The cable conductor is permitted to operate at a long-term temperature not exceeding 90°C, and during a short circuit (duration of 5 seconds), the temperature of the cable conductor shall not exceed 250°C.
(2) The ambient temperature during cable laying should not be below 0°C. If laying below 0°C is necessary, preheating must be conducted beforehand.
(3) Allowable bending radius: Single-core cable: Unarmored cable not less than 20 times the cable outer diameter, armored cable not less than 15 times the cable outer diameter; Multi-core cable:

Section 2: Execution Standards       GB/T 2706.1.3—2002
III. Features
The long-term allowable working temperature for cable conductors should not exceed 90°C, and the conductor's high temperature during a short circuit (5s) should be 250°C; the laying environment temperature should not be less than
          0℃。
2. Cable laying and installation permits a bending radius: single-core cables should not be less than 15 times the cable outer diameter; three-core cables should not be less than 10 times the cable outer diameter.

4+1 Core Cable

Nominal Section (mm) Insulation Nominal Thickness (mm) Unarmored Power Cable Armored Power Cable Allowable Continuous Current (A)
Sheath Nominal Thickness (mm) Approximate Cable Outer Diameter (mm) Sheath Nominal Thickness (mm) Approximate Cable Outer Diameter (mm) Air (30℃) Soil (25℃)
      Cu Al Cu Al
4×  4+1×2.5 1.0 0.8 1.8 16 1.8 19 26 20 34 28
4×  6+1×  4 1.0 1.0 1.8 17 1.8 20 32 26 44 37
4× 10+1×  6 1.0 1.0 1.8 21 1.8 23 46 35 61 47
4× 16+1× 10 1.0 1.0 1.8 24 1.8 26 60 47 79 61
4× 25+1× 16 1.2 1.0 1.8 27 1.9 30 78 60 103 79
4× 35+1× 16 1.2 1.0 1.8 30 2.0 32 96 75 122 94
4× 50+1× 25 1.4 1.2 2.0 34 2.1 39 116 91 146 112
4× 70+1× 35 1.4 1.2 2.2 39 2.3 44 147 116 183 141
4× 95+1× 50 1.6 1.4 2.3 44 2.5 49 187 141 216 174
4×120+1× 70 1.6 1.4 2.4 48 2.6 54 212 166 244 193
4×150+1× 70 1.8 1.4 2.6 53 2.8 58 247 191 282 216
4×185+1× 95 2.0 1.6 2.8 59 3.0 65 283 217 315 244
4×240+1×120 2.2 1.6 3.0 66 3.2 72 338 281 366 282