Hi Gordon:


>   Does anyone know from where the values for creepage and clearances given in
>   EN61010-1 ("safety requirements for electrical equipment for measurement,
>   control and laboratory use - part 1 general requirements") are derived i.e.
>   are there other standards "below" 61010 in this respect?

>From my review of an early version of IEC
61010, the creepage and clearance values 
in that early version were derived from IEC 
664.

Why are you asking?


Best regards,
Rich




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