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Testing if supplementary bonding is required.

MrJack96
I have read some bits stating we can measure between the two metallic parts in question and referring to the formula 


50/ia will give you the resistance needed to keep touch voltage to less than 50v 


my questions can we do the same test to determine if the part has a high enough resistance to not require bonding and what sort of figures we should look for?
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    For a TT system, the installation's earthing system could well be close to 230V above true earth nominal during a L-PE fault - likewise on a PME system during a broken CNE event. For a non-PME TN system it shouldn't get a lot above half of 230V, but if you want (for simplicity) to pick a single number for most cases 230V is probably a reasonable one.


       - Andy.
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    For a TT system, the installation's earthing system could well be close to 230V above true earth nominal during a L-PE fault - likewise on a PME system during a broken CNE event. For a non-PME TN system it shouldn't get a lot above half of 230V, but if you want (for simplicity) to pick a single number for most cases 230V is probably a reasonable one.


       - Andy.
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