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Which LVD harmonised standard[s]?

Udtwmc
Hi all,


I'm new to designing electrical equipment for 'test rigs', equipment I wouldn't define as machinery. On these rigs there may be measurement instrumentation, a low voltage control panel with a PLC, switchgear and control gear along with emergency stop circuits, The plant may have pipelines containing non-hazordous liquids/gases and control valves and pumps, but no external moving parts. 


So i'd like to know if there is a definitive LVD harmonised standard that I can buy with the aim of CE marking this equipment (obviously there's the EMC directive to condider but i'm just thinking in terms of the LVD as I don't beleive the Machinery Directive is relevant here, but maybe i'm wrong). Can for example EN60947-5-1 cover the LVD or is there a host of other standards I've not considered?


Also, where can the IET wiring regs BS7671 be of use for the purpose of CE marking electrical equipment?


Thanks in advance
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    Paul Skyrme:

    However, harmonised standards are not compulsory.....and following the harmonised standards to be able to claim a presumption of conformity.




    Very true. The Directives are the legal document and are what you must comply with. The EU then request CEN or CENELEC to produce a standard in support of the directive (rather in the manner of Al Capone requesting a favour....and having been a CENELEC TC Chairman I know what I am talking about). Any such standards, and any other relevant European or worldwide International Standards will then be cited as supporting standards and meeting those standards will be taken as 'presumed compliance' with the Directive. However if you are able to meet the requirements of the Directive by other means that is also acceptable, but as Paul says, you may have to justify your claim of compliance.


    As an extreme example I know of an instance where a standard had been prepared by ISO and was used in support of a particular Directive, but it was an electrical standard (and therefore not within the remit if ISO, but that is a different issue) and the relevant IEC committee did not consider it ensured safety. If somebody had been injured or killed by the equipment covered and questions had been asked, if it met the standard would have been considered as meeting the Directive and no action would be taken but if it did not meet the standard, then even if it was safer than the standard would have provided the manufacturer could be prosecuted. An extreme example, I know, and fortunately not something that has happened as far as I am aware.  I just present this example to support Paul's last statement.

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    Paul Skyrme:

    However, harmonised standards are not compulsory.....and following the harmonised standards to be able to claim a presumption of conformity.




    Very true. The Directives are the legal document and are what you must comply with. The EU then request CEN or CENELEC to produce a standard in support of the directive (rather in the manner of Al Capone requesting a favour....and having been a CENELEC TC Chairman I know what I am talking about). Any such standards, and any other relevant European or worldwide International Standards will then be cited as supporting standards and meeting those standards will be taken as 'presumed compliance' with the Directive. However if you are able to meet the requirements of the Directive by other means that is also acceptable, but as Paul says, you may have to justify your claim of compliance.


    As an extreme example I know of an instance where a standard had been prepared by ISO and was used in support of a particular Directive, but it was an electrical standard (and therefore not within the remit if ISO, but that is a different issue) and the relevant IEC committee did not consider it ensured safety. If somebody had been injured or killed by the equipment covered and questions had been asked, if it met the standard would have been considered as meeting the Directive and no action would be taken but if it did not meet the standard, then even if it was safer than the standard would have provided the manufacturer could be prosecuted. An extreme example, I know, and fortunately not something that has happened as far as I am aware.  I just present this example to support Paul's last statement.

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