JB/T 10181.1-2000 (English Version) PDF

Scope: This standard applies to the steady-state operating conditions of all AC voltage levels and DC voltage cables of 5kV and below laid in the air or soil. The soil includes cables laid directly buried in the ground, pipes, cable trenches or steel pipes with or without local soil drying. The term "steady state" means that a continuous constant current (100% load factor) is just sufficient to asymptotically reach the maximum temperature of the conductor under assumed constant ambient conditions. This section provides calculation formulas for rated current carrying capacity and various losses. These formulas are basically rigorous, and the values of some important parameters are intentionally not specified. They can be divided into three groups: 　——Parameters related to the cable structure (such as the thermal resistance coefficient of the insulation material), selected from those represented in public publications ——Parameters related to environmental conditions, whose values may vary widely, depending on the conditions of the laying site where the cable is used or where the cable will be used; 　——parameters derived from negotiations between the manufacturer and the user, including operating conditions Safety margin (e.g. maximum conductor temperature).

JB/T 10181.1-2000 history

2014 JB/T 10181.11-2014 Electric cables.Calculation of the current rating.Part 11: Current rating equations (100% load factor) and calculation of losses.General
2000 JB/T 10181.1-2000 Calculation of the current rating of electric cables.Part 1:Current rating equations(100% load factor) and calculation of losses.Section 1:General