BS EN 50499-2008 pdf download.Procedure for the assessment of the exposure of workers to electromagnetic fields.
3 Terms and definitions
action values
magnitude of directly measurable parameters provided in terms of electric field strength (E), magnetic field strength (H), magnetic flux density (B) and power density (S), contact current and limb induced current at which one or more of the specified measures in this Directive must be undertaken. Compliance with these values will ensure compliance with the relevant exposure limit values (from 2004/40/EC)
3.2
employer
any natural or legal person who has an employment relationship with the worker and has responsibility for the undertaking and/or establishment (from 89/391/EEC)
3.3
equipment
for the purpose of this standard, the term equipment is understood in a broad sense covering all sources of electromagnetic emission, including devices, products, instrumentation, installations and prototypes under development
BS EN 50499:2008
EN 50499:2008 – h –
3,4
exposure
exposure occurs whenever and wherever a person is subjected to external electric, magnetic or electromagnetic flelds or to contact current
3.5
exposure limits
guideline or restriction values on exposure that are given In international or national standards, guidelines or directives on human exposure to electromagnetic fields. For Directive 2004/4OIEC the exposure limits are the action values and the exposure limit values and also the other specific requirements in that directive to avoid other risks related to woricolace exoosure to electromaanetic fields.
3.6
exposure limit values
limits on exposure to electromagnetic fields which are based directly on established health effects and biological considerations. Compliance with these limits will ensure that workers exposed to electromagnetic fields are protected against all known adverse health effects (from 2004/4OIEC)
3.7
iisk assessment
process of determining compliance of a work place environment with the limits set in the Directive 2004/4OIEC by performing the actions stated in Article 4 of the Directive 2004/40/EC
3.8
work place
location where workers have access as part of their duties
3.9
worker
any person employed by an employer, including trainees and apprentices but excluuing domesuc servants (from 89/391!EEC)
4 General considerations on assessment
4.1 Introduction
This clause describes the general concept of an initial assessment of a work place, how to compare assessment results with the action values and exposure limits, and further actions if needed.
The exposure to be assessed is at the work place(s) where a worker is permitted to be present. Work place exposure level is assessed at ‘ocations (work spaces) to which a worker would have access as part of their duties, and its contributors are emissions from equipment affecting that location.
Other health and safety issues covered by the Directive, in particular workers with active implanted medical devices (AIMDs), pregnant workers, and indirect effects shall be addressed, e.g. as outlined in Annex A.
Annex B offers two forms that may be used to document the result of the assessment.
4.2 Overview of risk assessment procedure
The flowchart presented in Figure 1 shows graphically the assessment process. Prior to commencing the assessment process, and in order to determine what level of work place assessment, if any, is necessary the work place must first be charactensed. This requires the employer to establish what electrical equipment exists in the work place and is emitting electromagnetic fields into the work place.
The first decision box of Figure 1 relates to compliant equipment. Most work places will contain only electrical equipment which either does not produce electromagnetic fields or produces them at levels below general public exposure limits. These work places will require no further assessment. Clause 5 defines which electrical equipment can be excluded from detailed exposure assessment. Table 1 defined in Clause 5 provides examples of such equipment. It includes in particular any equipment which has been placed on the European market in compliance with the relevant community directives. Examples of EMF related harmonised standards are listed in Annex C.
NOTE Zoning concepts defined when the cotnp4ance ol the equipment was assessed can be implemented In agreenient with Annex G.
Table 2 in Clause 6 gives a non-exhaustive list of equipment which is likely to require further assessment In preparation for this, the employer should identify the type of equipment in the work place, characteristics (e.g. frequency, emitted power, duty factor) and its normal conditions of use (e.g. normal position of operator, position of other workers than the operator, time spent at normal position, operations or maintenance or repair at distances from the emitting equipment closer than those recommended In the manufacturers instructions etc.). See Clause 6.
The term normal” covers the intended use, the use as specified In the employers instructions to the workers, the installation(s) used, the instructions from the employer on how maintenance and repair shall be performed, situations of foreseeable incidents, and situations of foreseeable misuse.
Situations with simultaneous exposure to multiple sources and/or multiple frequencies shall be addressed. The employer can use the equations defined in Annex D, which provide a conservative way to demonstrate compliance with Directive 2004/40!EC. The employer may optionally use other appropriate methods e.g. time domain assessment procedures as provided in EN 62311 or the TEQ approach described in Annex E, which includes additional overestimation.BS EN 50499-2008 pdf download.BS EN 50499-2008 pdf download.