GB 7495-1987The protecting distance betweenoverhead power line and receiving station of AM broadcasting (English PDF)
架空电力线路与调幅广播收音台的防护间距
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Issued by
State Bureau of Standards
Level / Type
National · Mandatory
Issue date
March 24, 1987
Implementation date
November 1, 1987
Scope
GB 7495-1987 is the English-translated version of 架空电力线路与调幅广播收音台的防护间距.
GB 7495-1987 is the Chinese national standard on the protecting distance betweenoverhead power line and receiving station of am broadcasting, in the field of environment and health protection, safety.
It carries no /T suffix, which in the Chinese system means compliance is mandatory: a product or a practice within its scope has to meet it to be lawfully made, sold or carried out in China.
It was issued on 24 March 1987 by the State Bureau of Standards, and has been in force since 1 November 1987. Classification: ICS 13.260, CCS L06. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there.
The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.
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Document preview — GB 7495-1987
National Standard of the People's Republic of China
- ICS
- 13.260
- Classification
- L06
Issued by: State Bureau of Standards
Contents
- 1 Explanation of the terms
- 2 Units and symbols
- 3 Protective clearance between the overhead power lines and the amplitude-modulation broadcast receiving stations
- Annex A (informative) Measures for the protection against radio interference between overhead power lines and AM broadcasting receiving stations
- Annex B (informative) Recommended formulas for the calculation of the radio interference level of overhead power lines and of the protection distance of AM broadcasting receiving stations
3 Protective clearance between the overhead power lines and the amplitude-modulation broadcast receiving stations
Foreword
This document was issued on 24 March 1987 by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and has been in force since 1 November 1987.
It is the first edition of this standard.
Classification: ICS 13.260, CCS L06.
3 Classification and status
GB 7495-1987 is classified under ICS 13.260, in the field of environment and health protection, safety. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.
Its Chinese Standard Classification code is CCS L06. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.
The GB prefix without a suffix marks a mandatory national standard: compliance is required by law for the products or activities within its scope, and a product that does not meet it may not lawfully be placed on the Chinese market.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB 7495
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB 7495-1987 | The protecting distance betweenoverhead power line and receiving station of AM broadcasting | current edition | Current |
This page sells the current edition, GB 7495-1987. Earlier editions are listed for reference only.
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