JB/T 10181.22-2014Electric Cables - Calculation of the Current Rating - Part 22: Thermal Resistance - A Method for Calculating Reduction Factors for Groups of Cables in Free Air, Protected from Solar Radiation (English PDF)
电缆载流量计算 第22部分：热阻 自由空气中不受到日光直接照射的电缆群载流量降低因数的计算
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
May 6, 2014
Implementation date
October 1, 2014
Scope
JB/T 10181.22-2014 is the English-translated version of 电缆载流量计算 第22部分：热阻 自由空气中不受到日光直接照射的电缆群载流量降低因数的计算.
JB/T 10181.22-2014 is a recommended Chinese machinery industry standard and is part 22 of the series on the calculation of the current rating of electric cables, the part dealing with thermal resistance.
It gives a method for calculating the factor by which the current-carrying capacity of a group of cables is reduced when the cables run in free air and are not struck directly by sunlight.
It applies to flat-laid cables and cable groups of any type having the same diameter. It is declared an identical adoption of IEC 60287-2-2-1995, and it quotes IEC 60287-2-1.
The Chinese classification is K13 and the international one 29.060.20, and the issuing body is the Ministry of Industry and Information Technology.
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Document preview — JB/T 10181.22-2014
National Standard of the People's Republic of China
- ICS
- 29.060.20
- Replacing
- JB/T 10181.4-2000
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- 1 Scope
- 2 Normative references
1 Foreword
JB/T 10181.22-2014 was issued by MIIT on 6 May 2014 and has been in force since 1 October 2014.
It is one of 11 parts of the JB/T 10181 series.
2 Scope
This standard is a recommended Chinese machinery industry standard and is part 22 of the series on the calculation of the current rating of electric cables, the part dealing with thermal resistance. It gives a method for calculating the factor by which the current-carrying capacity of a group of cables is reduced when the cables run in free air and are not struck directly by sunlight. It applies to flat-laid cables and cable groups of any type having the same diameter. It is declared an identical adoption of IEC 60287-2-2-1995, and it quotes IEC 60287-2-1. The Chinese classification is K13 and the international one 29.060.20, and the issuing body is the Ministry of Industry and Information Technology.
3 Normative references
JB/T 10181.22-2014 cites the following standards, which apply in full or in part through the references made to them in its clauses.
IEC 60287-2-1
4 About this standard
Issued by: MIIT
English translation: about 15 pages
5 Related standards
Other parts of this standard:
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
JB/T 10181.3-2000 — Calculation of the current rating of electric cables - Part 2: Thermal resistance Section 1: Calculation of thermal resistance
JB/T 10181.4-2000 — Calculation of the current rating of electric cables - Part 2: Thermal resistance - Section 2: A method for calculating reduction factors for groups of cables in free air protected from solar radiation
JB/T 10181.5-2000 — Calculation of the current rating of electric cables - Part 3: Sections on operating conditions Section 1: Reference operating conditions and selection of cable type
JB/T 10181.6-2000 — Calculation of the current rating of electric cables - Part 3: Sections on operating conditions Section 2: Economic optimization of power cable size
JB/T 10181.11-2014 — Part 11: Current Rating Equations (100% Load Factor) and Calculation of Losses - General
JB/T 10181.12-2014 — Part 12: Current Rating Equations (100% Load Factor) and Calculation of Losses-Sheath Eddy Current Loss Factor for Two Circuits in Flat Formation
JB/T 10181.21-2014 — Part 21: Thermal Resistance - Calculation of Thermal Resistance
JB/T 10181.31-2014 — Part 31: Sections on Operating Conditions - Reference Operating Conditions and Selection of Cable Type
JB/T 10181.32-2014 — Calculation of the current rating of electric cables - Part 32: Operating conditions - Economic optimization of power cable size
6 Classification and status
International classification (ICS): 29.060.20
Prefix JB/T: recommended standard.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
IEC 60287-2-1
Similar standards
Editions of JB/T 10181.22
| Edition | Title | Revision | Status |
|---|---|---|---|
| JB/T 10181.22-2014 | Electric Cables - Calculation of the Current Rating - Part 22: Thermal Resistance - A Method for Calculating Reduction Factors for Groups of Cables in Free Air, Protected from Solar Radiation | current edition | Current |
| JB/T 10181.4-2000 | Electric Cables - Calculation of the Current Rating - Part 22: Thermal Resistance - A Method for Calculating Reduction Factors for Groups of Cables in Free Air, Protected from Solar Radiation | previous edition | Superseded |
This page sells the current edition, JB/T 10181.22-2014. Earlier editions are listed for reference only.
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Related Standards
JB/T 10181.31-2014 — Electric Cables - Calculation of the Current Rating - Part 31: Sections on Operating Conditions - Reference Operating Conditions and Selection of Cable Type
JB/T 10181.21-2014 — Electric Cables - Calculation of the Current Rating - Part 21: Thermal Resistance - Calculation of Thermal Resistance
JB/T 10181.32-2014 — Calculation of the current rating of electric cables - Part 32: Operating conditions - Economic optimization of power cable size
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JB/T 10181.22-2014
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