BS EN 50647:2017
$198.66
Basic standard for the evaluation of workers’ exposure to electric and magnetic fields from equipment and installations for the production, transmission and distribution of electricity
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 58 |
This European Standard provides a general procedure to assess workers’ exposure to electric and magnetic fields (EMF) in work places associated with the production, transmission and distribution of electric energy, and to demonstrate compliance with exposure limit values and action levels as stated in the Council and European Parliament “EMF” Directive 2013/35/EU [11].
The Council and European Parliament Directive 2013/35/EU will be transposed into national legislation in all the EU member countries. It is important that users of this standard consult the national legislation related to this transposition in order to identify the national regulations and requirements. These national regulations and requirements may have additional requirements that are not covered by this standard
It has the role of a specific workplace standard. It takes into account the non-binding application guide for implementing the EMF Directive [10] and it defines the assessment procedures and compliance criteria applicable to the electric industry.
The frequency range of this standard covers from DC to 20 kHz, which is sufficient to include the power frequency used for electric power supply systems throughout Europe (50 Hz) and the various harmonics and inter-harmonics occurring in the supply system. In this extremely low frequency range, electric and magnetic fields are independent and, therefore, they both have to be addressed in the exposure assessment.
Electrical companies also use radio frequency transmissions to operate and maintain their networks and power plants. Similarly, other exposures to EMF may occur during maintenance operations, for instance, due to the use of hand-held electrical tools. All these EMF sources are outside the scope of this standard.
Regarding EMF in the low frequency range, the scientific basis of the EMF directive is the ICNIRP health guidelines published in 2010 [13]. Reference is made to this scientific basis when necessary for justifying or clarifying some of the technical statements of the present document.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | 1 Scope 2 Normative references |
| 8 | 3 Terms, definitions, physical quantities, units and abbreviations 3.1 Terms and definitions |
| 10 | 3.2 Physical quantities and units 3.3 Abbreviations |
| 11 | 4 Assessment procedure |
| 12 | 5 Collection of technical data |
| 13 | 6 Methods for assessing exposure of workers 6.1 General 6.2 Exposure assessment regarding external fields 6.2.1 General |
| 14 | 6.2.2 Harmonics of magnetic field 6.2.3 Harmonics of electric field |
| 15 | 6.3 Numerical calculation of induced electric fields inside the human body 7 Assessment against exposure limits for the public 8 Assessment against Action Levels 8.1 General |
| 17 | 8.2 Simplified criteria for compliance with action levels 8.2.1 General 8.2.2 Magnetic fields |
| 18 | 8.2.3 Electric fields |
| 19 | 8.3 Assessment using measurements or calculations 8.3.1 General 8.3.2 Magnetic fields |
| 20 | 8.3.3 Electric fields |
| 21 | 9 Assessment against Exposure Limit Values 9.1 General 9.2 Simplified criteria for compliance with exposure limit values |
| 23 | 9.3 Assessment using dosimetry and considerations for non-uniform fields |
| 24 | 10 Exposure to DC fields 11 Exposure to contact currents 12 Exposure during transients and fault conditions |
| 25 | 13 Additional requirements for the employer 13.1 Workers at particular risk 13.2 Other requirements |
| 26 | Annex A (informative)Assessment of harmonics in magnetic fields A.1 Introduction A.2 Assessment Method using TEI |
| 28 | A.3 Assessment using the weighted peak function |
| 30 | A.4 Simplified assessment procedure for public grids |
| 31 | Annex B (normative)50 Hz magnetic field sources in the environment of equipment and installations for production, transmission and distribution of electricity B.1 General B.2 Currents in single conductors |
| 33 | B.3 Currents in circuits B.4 Assessing magnetic fields exposures |
| 35 | B.5 Check list for assessing compliance for magnetic fields |
| 36 | Annex C (informative)Examples of application of the different assessment criteria C.1 Assessment for air-cored reactors: Simplified calculation of the magnetic field under a vertical air-cored self-inductance |
| 38 | C.2 Assessment for insulated cables: Calculation of compliance distances for typical XLPE cables |
| 40 | C.3 Assessment for exposure to electric fields considering different coupling conditions |
| 43 | Annex D (informative)Method for deriving Exposure-Limit-Equivalent-Fields (LEFs) D.1 Introduction D.2 Method |
| 44 | D.3 Selection of the reference model: D.4 Reference organs and data |
| 45 | D.5 Uncertainty assessment |
| 46 | D.6 Deriving the Exposure-Limit-Equivalent-Field (LEF) |
| 47 | Annex E (informative)Considerations about DC magnetic fields in electrical companies E.1 Introduction E.2 Exposure of workers to DC magnetic field in electrical companies E.3 Attention points |
| 48 | Annex F (informative)contact currents F.1 Introduction F.2 Influence of electric fields F.2.1 General F.2.2 Person isolated (at floating potential), capacitive coupling to ground |
| 49 | F.2.3 Person at earth potential, isolated object |
| 50 | F.2.4 Spark discharges F.3 Influence of magnetic fields F.3.1 General F.3.2 Working adjacent to live circuits |
| 51 | F.4 Summary |
| 52 | Annex G (informative)Exposure during transient and fault conditions G.1 Introduction G.2 Faults G.2.1 Overview G.2.2 Short-circuit currents during faults G.2.3 Prevention and protection against faults |
| 53 | G.2.4 Magnetic field exposures during faults G.3 Switching transients G.4 Lightning strikes G.5 Inrush currents |
| 54 | G.6 Compliance of short-duration events with the Directive |
