Earthing in a flat

[Mashby22]

Hi guys

I'm new to testing. I have installed a lighting circuit and ring final which I am doing an eic for. I noticed in the board it seems like there isn't a main earth. The service cupboard on landing has 3 box with 3 meter for 3 flats on that landing. Those boxes are fed from a box in riser where the bs88 fuses are. There fed from 3 metal tubes fed from below which feeds the fuses, the neutral bar and the earth bar. From the earth bar there are 3 earths which feed the 3 boxes with the meters. From there to the flats are fed by a mineral cable. Each mineral gland is connected together by a bar which is connected to the end box which happens to be the flat I'm working on. So I've established the flat is earthed by the gland. Behind the c/u in the flat there are two metal backboxes in the wall which has the cable for their circuits and the mineral cable to the main switch. Those backboxes have a 6mm earth to the earth bar in board.
To test if those were the main earth I tested between earth in a socket near by and the earth by getting continuity as should, disconnected one of the 6mm from the backbox still getting continuity. Disconnected both together and still get continuity... So how do I disconnect to do ze, or test for the pfc. Hope I'm making a meal out of a mole hill here.
Appriciate the help guys:/)

 

[Mashby22]

Have a kewtech kt65.
psc, L-N
pfc, L-E. Which would be the same test as zbd but on loop setting.

 

[davesparks]

I have the same tester
The L-N setting is used for most Zs tests as it's the high current EFLI setting, the L-E is the low current setting

 

[Mashby22]

This tester is new to me.
I thought loop was used for zs And the higher of psc and pfc to get ipf

 

[davesparks]

This tester is new to me.
I thought loop was used for zs And the higher of psc and pfc to get ipf

Then read the manual and learn how to use the functions. It won't tell you which function to use for which test though, only how to use each function.

It has two loop tests, high current and low current. You need high current for Zs testing except for circuits where it will cause protective devices to operate

 

[Mashby22]

Yes I'm with you. I mis understood your last message as I mentioned pfc before that. Oke more thing then as been a long day. On my test sheet what size do I put as the main earthing conductor if it's being earthed by the mineral gland. The mineral gland is fixed to a metal back box with has a 6mm earth to the board. Dont seem right as the binding size is bigger

 

[Simonslimline]

Yes I'm with you. I mis understood your last message as I mentioned pfc before that. Oke more thing then as been a long day. On my test sheet what size do I put as the main earthing conductor if it's being earthed by the mineral gland. The mineral gland is fixed to a metal back box with has a 6mm earth to the board. Dont seem right as the binding size is bigger

What does the adiabatic tell you?

 

[davesparks]

Yes I'm with you. I mis understood your last message as I mentioned pfc before that. Oke more thing then as been a long day. On my test sheet what size do I put as the main earthing conductor if it's being earthed by the mineral gland. The mineral gland is fixed to a metal back box with has a 6mm earth to the board. Dont seem right as the binding size is bigger

When micc is used the cpc size can be recorded as 'micc' or 'sheath' or the actual value obtained from the data sheet.