C2 or C3

[Pete999]

Wired direct into the lighting circuit.

Is the rest of the lighting circuit earthed? in other words has some Dilbert just run a 2 core cable to the units off of the existing circuit ?

 

[Davisonp]

Is the rest of the lighting circuit earthed? in other words has some Dilbert just run a 2 core cable to the units off of the existing circuit ?

No, the entire upstairs is unearthed, however, there was a test in 1998 and the tester recorded a Zs for the upstairs lighting, so three possibilities.
1) The circuit has lost it’s earth.
2) The result recorded was a mistake.
3) There are 3 cables in the MCB and the old Zs recorded is surprisingly low for the length of the cable I was trying to measure, so the Zs test results may be at a point on one of the other cables that is earthed.

NOTE: The florescent fittings are the only class 1 fitting on the upstairs, no metal switches or lights.
It is twin and earth to the pendants I can get into and into the florescent fittings but floating earth at the pendants and florescent fittings.
I will be doing some investigation to see if the three cables are Twin and earth from the consumer unit and if it is, finding the break in the cable somewhere.
I will also have to break into one of the 1960’s pendants in the old part of the building to replace it, and then I will be able to confirm if the cable used originally is T&E or just 2 core.

 

[westward10]

So you are saying there is a cpc present but it has no continuity, or there is no cpc present.

 

[Wilko]

deleted

 

[Pete999]

So you are saying there is a cpc present but it has no continuity, or there is no cpc present.

Was going to ask the same thing but you beat me to it

 

[Davisonp]

So you are saying there is a cpc present but it has no continuity, or there is no cpc present.

Yes, I was not thinking straight. There is a CPC in the upstairs 1980’s extension but no earth continuity. I had assumed that as there were no class 1 fittings upstairs (Until I discovered the Florescent fittings) that the 80’s extension wiring had extended the non earthed old lighting circuit, but it should have been earthed when it was built, so I will need to be investigating and re-instating the earth to the upstairs lighting circuit and confirming the old part of the building is earthed.

 

[Pete999]

Yes, I was not thinking straight. There is a CPC in the upstairs 1980’s extension but no earth continuity. I had assumed that as there were no class 1 fittings upstairs (Until I discovered the Florescent fittings) that the 80’s extension wiring had extended the non earthed old lighting circuit, but it should have been earthed when it was built, so I will need to be investigating and re-instating the earth to the upstairs lighting circuit and confirming the old part of the building is earthed.

Probably find that some Dilbert doing the 2nd fix cut all the cpcs off because "they aren't needed"

 

[telectrix]

Probably find that some Dilbert doing the 2nd fix cut all the cpcs off because "they aren't needed"

once you have used the cpc to strip the sheath, it is redundant. it is an ex cpc, not dead, just resting.