1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Determination of workers exposure to electromagnetic fields and assessment of risk at a broadcast siteBS EN 50496:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50496 March 2018 ICS 17.240 Supersedes EN 50496:
2、2008English Version Determination of workers exposure to electromagnetic fields and assessment of risk at a broadcast site Dtermination de lexposition des travailleurs aux champs lectromagntiques et valuation des risques sur un site de radiodiffusion Ermittlung der Exposition von Arbeitnehmern gegen
3、ber elektromagnetischen Feldern und Bewertung des Risikos am Standort eines Rundfunksenders This European Standard was approved by CENELEC on 2017-12-25. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
4、 status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, Fr
5、ench, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austri
6、a, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia
7、, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All
8、rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50496:2018 ENational forewordThis British Standard is the UK implementation of EN 50496:2018. It supersedes BS EN 50496:2008, which is withdrawn.The UK participation in its preparation was entrust
9、ed to Technical Committee GEL/106, Human exposure to low frequency and high frequency electromagnetic radiation.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. U
10、sers are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 95540 2ICS 17.240Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of
11、the Standards Policy and Strategy Committee on 30 April 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 50496:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50496 March 2018 ICS 17.240 Supersedes EN 50496:2008English Version Determination of worke
12、rs exposure to electromagnetic fields and assessment of risk at a broadcast site Dtermination de lexposition des travailleurs aux champs lectromagntiques et valuation des risques sur un site de radiodiffusion Ermittlung der Exposition von Arbeitnehmern gegenber elektromagnetischen Feldern und Bewert
13、ung des Risikos am Standort eines Rundfunksenders This European Standard was approved by CENELEC on 2017-12-25. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any
14、 alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other lang
15、uage made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the
16、 Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and t
17、he United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of exploitation in any form and by
18、any means reserved worldwide for CENELEC Members. Ref. No. EN 50496:2018 EBS EN 50496:2018EN 50496:2018 (E) 2 Contents Page European foreword . 3 1 . Scope . 4 2 . Normative references. 4 3 . Terms and definitions 5 4 . Assessment methods 7 5 . Collection of technical data 8 6 . Determination of exp
19、osure levels by calculation or measurement 9 7 . Zoning of exposure work place 12 8 . Checking of operating procedures in the different exposure work places16 9 . Information and training 19 10 . Assessment report .20 Annex A (normative) Summation formulae 21 A.1 . General 21 A.2 . Frequency range f
20、rom 1 Hz to 10 MHz .21 A.3 . Frequency range from 100 kHz to 300 GHz .22 A.4 . Contact currents in the frequency range 1 Hz to 110 MHz 23 Annex B (informative) Marking 24 Bibliography 25 BS EN 50496:2018EN 50496:2018 (E) 3 European foreword This document (EN 50496:2018) has been prepared by CLC/TC 1
21、06X “Electromagnetic fields in the human environment”. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2018-12-25 latest date by which the national standards conflicting
22、 with this document have to be withdrawn (dow) 2020-12-25 This document supersedes EN 50496:2008. The main changes included in the EN 50496:2018 with respect to EN 50496:2008 are consequential to the replacement of Directive 2004/40/EC by Directive 2013/35/EU. Attention is drawn to the possibility t
23、hat some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association, and
24、 supports essential requirements of EU Directive(s). BS EN 50496:2018EN 50496:2018 (E) 4 1 Scope This European Standard provides methods for assessing compliance with the requirements of the Directive 2013/35/EU at a site operating one or more broadcast transmitters. This standard covers the frequen
25、cy range up to 40 GHz. Users of this standard are invited to consult the national legislation in order to identify the national regulations and requirements. These national regulations and requirements can have additional requirements that are not covered by this standard. 2 Normative references The
26、 following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50413,
27、Basic standard on measurement and calculation procedures for human exposure to electric, magnetic and electromagnetic fields (0 Hz - 300 GHz) EN 50420, Basic standard for the evaluation of human exposure to electromagnetic fields from a stand alone broadcast transmitter (30 MHz - 40 GHz) EN 50475, B
28、asic standard for the calculation and the measurement of human exposure to electromagnetic fields from broadcasting service transmitters in the HF bands (3 MHz - 30 MHz) EN 62226-2-1, Exposure to electric or magnetic fields in the low and intermediate frequency range - Methods for calculating the cu
29、rrent density and internal electric field induced in the human body - Part 2-1: Exposure to magnetic fields - 2D models (IEC 62226-2-1) EN 50527-1, Procedure for the assessment of the exposure to electromagnetic fields of workers bearing active implantable medical devices Part 1: General EN 50527-2-
30、1, Procedure for the assessment of the exposure to electromagnetic fields of workers bearing active implantable medical devices Part 2-1: Specific assessment for workers with cardiac pacemakers EN 50647, Basic standard for the evaluation of workers exposure to electric and magnetic fields from equip
31、ment and installations for the production, transmission and distribution of electricity Council Recommendation 1999/519/EC of 12 July 1999 on the limitation of exposure of the general public to electromagnetic fields (0 Hz to 300 GHz) (Official Journal L 199 of 30 July 1999) Directive 2013/35/EU of
32、the European parliament and of the council of 26 June 2013 on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (electromagnetic fields) (20th individual Directive within the meaning of Article 16 of Directive 89/391/EEC) BS EN 504
33、96:2018EN 50496:2018 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online
34、browsing platform: available at http:/www.iso.org/obp 3.1 action levels action levels (ALs) means operational levels established for the purpose of simplifying the process of demonstrating the compliance with relevant ELVs or, where appropriate, to take relevant protection or prevention measures spe
35、cified in Directive 2013/35/EU Note 1 to entry: For electric fields, low ALs and high ALs means levels which relate to the specific protection or prevention measures specified in Directive 2013/35/EU. Note 2 to entry: For magnetic fields, low ALs means levels which relate to the sensory effects ELVs
36、 and high ALs to the health effects ELVs. 3.2 AIMD Active Implantable Medical Device 3.3 antenna device that serves as a transducer between a guided wave (e.g. coaxial cable) and a free space wave, or vice versa 3.4 near-field region region generally in proximity to an antenna or other radiating str
37、ucture, in which the electric and magnetic fields do not have a substantially plane-wave character, but vary considerably from point to point Note 1 to entry: The near-field region is further subdivided into the reactive near-field region, which is closest to the radiating structure and that contain
38、s most or nearly all of the stored energy, and the radiating near-field region where the radiation field predominates over the reactive field, but lacks substantial plane-wave character and is complicated in structure. 3.5 broadcasting service radiocommunication service in which the transmissions ar
39、e intended for direct reception by the general public Note 1 to entry: This service can include sound transmissions, television transmissions or other types of transmission, e.g. data. 3.6 broadcast site site operating one or more broadcast transmitters BS EN 50496:2018EN 50496:2018 (E) 6 3.7 contac
40、t current current flowing into the body resulting from contact with a conductive object in an electromagnetic field Note 1 to entry: This is the localized current flow into the body (usually the hand, for a light brushing contact). Note 2 to entry: Shocks and burns can be the adverse indirect effect
41、s. Note 3 to entry: Contact current relates to a short-term effect and cannot be time-averaged. 3.8 induced current current flowing inside a human body resulting directly from an exposure to an electromagnetic field 3.9 employer any natural or legal person who has an employment relationship with the
42、 worker and has responsibility for the undertaking and/or establishment (Directive 89/391/EEC) 3.10 exposure limit values (ELVs) limits on exposure to electromagnetic fields in Directive 2013/35/EU established on the basis of biophysical and biological considerations, in particular on the basis of s
43、cientifically well-established short-term and acute direct effects, i.e. thermal effects (SAR, Power density) and electrical stimulation of tissues (internal electric field): health effects ELVs: ELVs above which workers might be subject to adverse health effects, such as thermal heating or stimulat
44、ion of nerve and muscle tissue; sensory effects ELVs: sensory effects ELVs apply to frequency ranges of 0 Hz to 400 Hz (magnetic and electric fields) and 0,3 GHz to 6 GHz (pulsed signals) and above which workers might be subjected to transient disturbed sensory perceptions and minor changes in brain
45、 functions 3.11 local safety instruction safety instructions relating to a specific broadcast site and containing the information specified in Clause 8: it needs to include all the necessary safety-related indications and, if applicable, point out the possible risk of exposure to electromagnetic fie
46、lds where these are at levels above the worker action levels; it could include all the necessary safety-related indications and, if applicable, point out the possible risk of exposure to electromagnetic fields where these are at levels above the limits for the general public 3.12 magnetic flux densi
47、ty magnetic flux density (B) is a vector quantity resulting in a force that acts on moving charges. The magnitude of magnetic flux density (B) is expressed in tesla (T) B = H where is the permeability of the medium and H is the magnetic field strength Note 1 to entry: In free space and in biological
48、 materials, magnetic flux density and magnetic field strength (H) can be interchanged using the magnetic field strength of H = 1 A/m equivalence to magnetic flux density of B = 4 107T (approximately 1,25 microtesla). BS EN 50496:2018EN 50496:2018 (E) 7 3.13 power density power per area unit normal t
49、o the direction of electromagnetic wave propagation S=EH = E2/Z=H2Z Note 1 to entry: For plane waves the power density (S), electric field strength (E) and magnetic field strength (H) are related by Z = Z0 = 120 = 377 Note 2 to entry: E and H are expressed in units of V/m and A/m, respectively, and S in the unit of W/m2. 3.14 transmitter device to generate the radio frequency broadcast signal which is fed into the antenna system 3.15 worker any person employed by an employer, including trainees and apprentices but exc
