On 10/3/2011 3:43 AM, andy pugh wrote:
> On 3 October 2011 08:29, Sven Wesley<svenne.d...@gmail.com>  wrote:
>
>    
>> At the same time, An extremely expensive Siemens VFD fired off the RCD...
>>      
> That is probably because the Siemens VFD includes an input-side
> filter. Unfortunately filters provide a path to earth, and RCDs are
> designed to detect that.
>
>    
I thought that EU standards dictated the use of input side filters.. yet 
they trip your RCDs..  so how does that work in real life?

Are RCDs not required in factories?

Dave

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