Compliance of IEC61010-1 and VDE0884-10

Hello,

 

I am confused about the safety ratings of the part ADuM4120. Its datasheet states reinforced insulation for a working voltage of 400Vrms to meet IEC61010-1, while the rating for reinforced insulation with VDE0884-10 is 849Vpeak.

 

According to the section 14 of IEC61010-1, this norm accepts any part meeting another recognized safety standard. This means that ADuM4120 would meet reinforced insulation for 849Vpeak because it complies with VDE0884-10. So, why the rating specified for IEC61010-1 in the datasheet is lower (400Vrms)?

 

Thank you in advance.

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  • 0
    •  Analog Employees 
    on Dec 8, 2017 12:57 AM

    Hello,

    The confusion here is that you are comparing two types of certification.  VDE-0884-10 is a component level certification, and to start, it quotes peak working voltage, so there is a factor of 1.41 to be accounted for when making comparisons.  The philosophy behind a component cert is to give each parameter its maximum possible value under the test conditions of the cert.  So Working voltage gets quoted independent of the limitations of package size for example.

    System level certs like IEC61010 ties all of the requirements into a coherent bundle depending on the installation, pollution degree, mold compound category etc..  So they will not quote a working voltage that is larger than the package and application can support.

    The component certification has to tell what is possible, the system level cert sets the limits for that system.  When we ask for a system level certification, the agency makes some general assumptions about systems that get applied to everyone, such as Pollution degree 2 and Material Group III and installation class 2 in order to quote numbers that can be compared between products.  Those assumptions may not reflect a real system, so the system numbers can be adjusted if the assumptions do reflect the actual usage or component capabilities.  A good example is that our parts actually support at least Material Group II, so the working voltages can be higher than what is written in the certification directly.  If we imposed those limitations at the component certification level, it would exclude those types of adjustments.  This leads to questions like yours when the numbers do not seem to line up.

    Best Regards,

    MSCantrell

Reply
  • 0
    •  Analog Employees 
    on Dec 8, 2017 12:57 AM

    Hello,

    The confusion here is that you are comparing two types of certification.  VDE-0884-10 is a component level certification, and to start, it quotes peak working voltage, so there is a factor of 1.41 to be accounted for when making comparisons.  The philosophy behind a component cert is to give each parameter its maximum possible value under the test conditions of the cert.  So Working voltage gets quoted independent of the limitations of package size for example.

    System level certs like IEC61010 ties all of the requirements into a coherent bundle depending on the installation, pollution degree, mold compound category etc..  So they will not quote a working voltage that is larger than the package and application can support.

    The component certification has to tell what is possible, the system level cert sets the limits for that system.  When we ask for a system level certification, the agency makes some general assumptions about systems that get applied to everyone, such as Pollution degree 2 and Material Group III and installation class 2 in order to quote numbers that can be compared between products.  Those assumptions may not reflect a real system, so the system numbers can be adjusted if the assumptions do reflect the actual usage or component capabilities.  A good example is that our parts actually support at least Material Group II, so the working voltages can be higher than what is written in the certification directly.  If we imposed those limitations at the component certification level, it would exclude those types of adjustments.  This leads to questions like yours when the numbers do not seem to line up.

    Best Regards,

    MSCantrell

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