This is an interesting topic which has digressed from the original point to whether the "Y" cable family should be used or not. In an attempt to add to the debate here is my contribution, ( a little long but as brief as I can).
Part One of the Regs is a good place to start
Regulation 133.1.1...
The awarding bodies blame the industry. It change from the 2391-10 to 2394 & 2395 because it was claimed that those that past the 2391-10 could not do periodic reports. Now it's claimed that the industry associate the number 2391 as the exam number for inspection & testing so hense the number...
Didn't say they provided an earth terminal
ESQCR 24(4) says - "Unless he can reasonably conclude that it is inappropriate for reasons of safety, a distributor shall, when providing a new connection at low voltage, make available his supply neutral conductor or, if appropriate, the protective...
Unlike us sparks working t0 the wiring regs the DNO operates to the ESQCR which requires them for new supplies to provide an earthing unless they deemed it would be unsafe to do so. Therefore they use TNCS (PME) systems for new supplies due to cost and if they believe it unsafe to make the...
That's correct and what reg 544.1.1 says
TNC-S needs 10mm and always has done
Chances are that if the original bonding was 6mm then it may not be a TNC-S supply but still needs to be confirmed
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