Fault on domestic home wiring

[Kyleb2210]

110v from switch to switch (see attached picture), tn-cs system with 30mA RCD in Place, trips fine when tested at 100% and 500% customer complained of getting shocked when touching both switches at once but doesn’t trip with this fault, have a few theories, but any suggestions?

 

[Octopus]

A test with your wander lead and MFT set on R2 should tell you all you need to know - without undoing anything but the CU cover...

 

[The Ghost]

If you mean low ohms then that could be impossible if there is >50v

 

[snowhead]

I’m starting to get a bad name on here!

Starting to???

 

[CACJL]

110v from switch to switch (see attached picture), tn-cs system with 30mA RCD in Place, trips fine when tested at 100% and 500% customer complained of getting shocked when touching both switches at once but doesn’t trip with this fault, have a few theories, but any suggestions?

View attachment 39502

If cannot sort this one out without advice, you need a career change.