Shower feed wired in wrong

[1stfix2ndfix]

I was wondering if anyone can answer this one for me. I'm an electricians mate, I did ask the guy I'm with but he couldn't give me an answer.

So after he changed the board and I did the bonding I get to go round testing. Whilst taking the zs of the shower I noticed immediately upon removing the over that the feed had been wired up wrong. The live was with the live but the neutral from the feed was wired up to the earth terminal/cable in the shower and likewise the earth from the feed was wired up to the neutral terminal and cable of the shower. Now spotting this I asked the customer who had wired this up as they have done it wrong and I was told the fire fitter lol. She then asked me why it had worked and was still working. I didn't really have a answer and nor did the guy I'm with if I'm honest so I'm just wondering if anyone knows the answer to that one. Was it unsafe and were they just lucky. I felt a right idiot not knowing the answer but hopefully next time I'll be able to fill em with confidence in my response

 

[shanky887614]

R1+R2 is one of two ways of carring out the "Continuity of Circuit Protective Conductor" test.


DEAD test, safe isolation and prove it's dead before carrying out the test

A temporary link installed at the C/U (or I prefer to take the live conductor of the circuit and put it in the earth bar), test at shower between Line & Earth with a continuity tester.

Then you would get your result in Ohms, and check that in accordance to table L1 On-Site Guide BS7671:2008

or in one sentence.

R1 = line
R2 = cpc
Rn= n

bassically combined resistance of line + cpc (link together and test at other end)

 

[Silly Sausage]

or in one sentence.

R1 = line
R2 = cpc
Rn= n

bassically combined resistance of line + cpc (link together and test at other end)

and then if you so wished, if you know the approximate length of the circuit, you can compare your measurement with the value in the resistance tables.
If they widely differ, that would imply there's a fault somewhere.

 

[1stfix2ndfix]

Thanks for your answers and the help