Mark --

Interesting question!

I would agree with 3.5 mA for cord and plug connected stationary equipment up 
to several HP. However, note that 8.2.6e) of 60204-1 describes cord and plug 
connected equipment with leakage above 10 mA.

However, I think that a quite large piece of machinery that could fall under 
the scope of 60204-1 might well have leakage currents above 10 mA, making it 
hard to set an absolute limit. As 8.2.6 suggests, such a high current is 
probably best addressed by very robust grounding, as well as bonding.

Note also that for North America, UL limits are generally quite lower than 3.5 
mA.

Mike Sherman
Retired Product Safety Engineer


>     On 02/01/2022 12:24 PM Stultz, Mark 
> <00000f79f2e10e47-dmarc-requ...@listserv.ieee.org> wrote:
> 
> 
> 
>     Hello,
> 
>     Is there a hard limit for leakage current for machinery in the EU?  IEC 
> 60204-1 provides instructions in clause 8.2.8 for “equipment having earth 
> leakage currents higher than 10 mA”.  This seems quite high so we have 
> applied the 3.5 mA limits for class 1 stationary equipment in IEC 60335-1.  
> Is there another source for leakage current limits that is 
> machinery-specific?  There is nothing in the type-C standard for this product 
> type.
> 
>      
> 
>     Thanks,
> 
>      
> 
>     Mark Stultz
> 
> 
> 
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