Joined: 25 July 2008
EN60204-1 18.2.2 says "......The resistance
measured shall be in the expected range according to the length, the cross sectional area
and the material of the related protective bonding conductor(s)....."
Easy enough to a calculate the theoretical conductor resistance, although on an old machine it can be a bit difficult to decide what the conductor size is.
The standard does not mention connection impedance but that can be a significant part of the overall protective bonding circuit impedance and can often be more of a problem than undersized conductors.
Is there any guidance about what could be considered a reasonable range for connection resistance?