Very high r1+r2 readings and Zs in conduit?

[Kev2632]

Hi,

Why would I be getting very high r1r2 readings and Zs readings in a water heater circuit wired in the existing conduit when the house was built back in 19oatcake...? Would the conduit have anything to do with it and if so? Why?

Thanks

 

[VoltzElectrical]

loose connection somewhere?

 

[WPD Lad]

Immersion heater?

 

[trev]

Not enough info to make a judgment Kev. What's the earthing system/Ze/Zs readings on other circuits/have you recently installed an RCD etc etc etc

 

[Kev2632]

All my other circuits readings was good, tn-s system, all connections are tight, and disconnected the water heater supply side from the switch and was still getting weird readings??

 

[VoltzElectrical]

JB somewhere? dunno, just clutching now.

 

[trev]

If it's been wired donkey's years ago I'd be thinking of a JB somewhere.
Is the conduit your CPC?

 

[Kev2632]

Nope no jb, would the badly made off conduit end or something affect the readings for r1r2 and Zs?

 

[Kev2632]

Yea just the conduit as my cpc, and no JB's anywhere

 

[trev]

A jb could be under a floor, if the conduit is your CPC then a poor loint could be to blame but like Voltz said, I'm clutching a little here

 

[Kev2632]

Yea, what ya mean your clutching?

 

[sedgy34]

kev,
sounds like you have a break in the conduit joint ive had similair problem before in a church make sure you completely eliminate the swith from the circuit too

 

[Kev2632]

Yea that's what I'm thinking too, yea I elminated the switch from the circuit so I only had my live coming in from the consumer unit, and tested to the earth on the backpack where the conduit came in, you know?

 

[VoltzElectrical]

how high are these readings? I mean that would have to some pretty badly made off conduit.

 

[trev]

Yea, what ya mean your clutching?

Clutching at straws mate. One of my many skills

 

[sedgy34]

great minds think alike forget all other responses with jbs etc (lol) JOKE!!!!

 

[Kev2632]

I was getting 200ohms+ everytime ??? :/

 

[sedgy34]

how high are these readings? I mean that would have to some pretty badly made off conduit.

this problem has probably happened when some renovation works have been carried out without messing with the electrics

 

[VoltzElectrical]

can u uncover any conduit boxes and try pulling on the cables. Surely the benefit of conduit wiring is that it can be rewired easily? May be possible to pull a cpc in?

 

[Kev2632]

with the CSA of the conduit in which its wired, will that allow it too have such a high reading? or would that normally give a very low reading if the conduit is " sound", because the CSA area is bigger so it should in theory have alot lower reading than the R1+R2 of live to earth in twin and earth yea??