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Testing if supplementary bonding is required.

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?
Parents
  • Am I right in saying in both cases (broken PEN)the installation should be safe only considering all bonding requirements have been met? The only issue is outside the Equipitential zone? That’s why in some cases it’s not a good idea to bond outside taps due to the fact if the Met was at 230v within the installation the tap would then be at the same potential meaning the folk who ends up touching this will be in a dangerous scenario?
Reply
  • Am I right in saying in both cases (broken PEN)the installation should be safe only considering all bonding requirements have been met? The only issue is outside the Equipitential zone? That’s why in some cases it’s not a good idea to bond outside taps due to the fact if the Met was at 230v within the installation the tap would then be at the same potential meaning the folk who ends up touching this will be in a dangerous scenario?
Children
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