- Reaction score
- 8,896
Excuse quick diversion, then back to interesting TNS question!
-GN7 says hot tubs outside should have section 702 applied.
-702.140.3.4.3 (ii) NOTE says:
"Where a PME earthing facility is used as the means of earthing [.....] it is recommended that an earth mat [...] of suitably low resistance e.g. 20 ohms or less , be installed and connected to the supplementary bonding."
Ok, I accept that's a recommendation based on a guidance note but had it been followed the (likely) problem in this thread wouldn't have happened.
In addition, one could argue that:More and more I am thinking all hot tubs should be on a TT supply, as even if your supply appears to be TN-S there is a chance that elsewhere repairs or cable replacement has essentially converted your supply to TN-C-S (just a rather long 'S' there).
-GN7 says hot tubs outside should have section 702 applied.
-702.140.3.4.3 (ii) NOTE says:
"Where a PME earthing facility is used as the means of earthing [.....] it is recommended that an earth mat [...] of suitably low resistance e.g. 20 ohms or less , be installed and connected to the supplementary bonding."
Ok, I accept that's a recommendation based on a guidance note but had it been followed the (likely) problem in this thread wouldn't have happened.