Testing question.

[Des 56]

You start with the basic information and I would probably prefer you to make some information so that you will recognize what is the function of that certain matter and how does it affect. However, please make some clarification regarding this matter.


It seems our American friend is trying to learn about the electrical trade and is doing so through a second language
He seems to be requesting a better description of the supply type etc to help him understand what is being discussed

Or
They are screening Yes minister in LA

 

[commandoallan]

Hello All,

I have delved further into this and have done a ZE test at the hook up point and got a reading of 3.1 ohms which is still above the 0.8 max it should be. I then tested inside the caravan at the ccu and got somewhere around 40 ohms. It stands to reason that I have a dodgy connection between the ccu and hook up point which I will fix by reterminating at the hook up point and retesting at the ccu hopefully with better results, if not then I will run in a new supply.

Thanks all, hope you can understand this as I did not understand the last post by a person from abroad.

Cheers, Allan.

 

[Engineer54]

Hello All,

I have delved further into this and have done a ZE test at the hook up point and got a reading of 3.1 ohms which is still above the 0.8 max it should be. I then tested inside the caravan at the ccu and got somewhere around 40 ohms. It stands to reason that I have a dodgy connection between the ccu and hook up point which I will fix by reterminating at the hook up point and retesting at the ccu hopefully with better results, if not then I will run in a new supply.

Thanks all, hope you can understand this as I did not understand the last post by a person from abroad.

Cheers, Allan.

So what about the Ze value at the source where this hook-up point (and all the rest of the hook-up points on the site) are fed from?? This is where you should have started your investigation, not at the adjacent hook-up point to the caravan your working on!! The 3.1 ohm Zdb value at this hook-up still doesn't comply does with a TN-S system does it?? You will at the very least need to inform the caravan site owner operator/management of your findings. My best guess at the moment (if it is a TN-S system) would be a combination of long cable distances and the SWA earthing connections/continuity at the hook-up positions...

 

[gnselectricals]

Sink a rod & tt the pitch supply box & check for dodgy connections on the. Socket outlet & flex to van.
Don't change any rcd's as that's how it's supposed to be wired
Also check out section 708 & 721 in the regs
Cheers

 

[Engineer54]

Well, well, ...In other words don't bother being an electrician and checking anything, just bung a rod in the ground and TT the pitch!! Makes perfect sense that, 200 ohms to replace 3 ohms!! Oh and who cares, if that there won't be any discrimination between the supply hook-up and caravan RCDs!!

Great advise all round that!! ...Jesus!!

 

[Robert Turnbull]

i think the rod manufactures are trading on secret on here.

Every day its sink/bash a rod!

 

[gnselectricals]

Well he's obviously got some problems there regarding the supply earth, or the distribution to the pitch. Obviously getting a good reading on the tns earth would be a better solution than a rod.

Well, well, ...In other words don't bother being an electrician and checking anything, just bung a rod in the ground and TT the pitch!! Makes perfect sense that, 200 ohms to replace 3 ohms!! Oh and who cares, if that there won't be any discrimination between the supply hook-up and caravan RCDs!!

Great advise all round that!! ...Jesus!!

Also you should check 708 & 721 in the regs as they don't call for discrimination between the pitch & van rcds & insist on 30mA devices at each location.

 

[commandoallan]

Thanks all,

I will have a read up in the regs!!!

Cheers, Allan.

 

[LlandrilloSpark]

Ze first test u ever do before carrying out any work minor or major, you shouldn't really be adding to an installation that isn't earthed correctly, like you say your new to testing so you will learn from this

 

[Pete999]

Way too high, probably a problem at the supply to the van, any RCDs present

 

[Engineer54]

Well he's obviously got some problems there regarding the supply earth, or the distribution to the pitch. Obviously getting a good reading on the tns earth would be a better solution than a rod.



Also you should check 708 & 721 in the regs as they don't call for discrimination between the pitch & van rcds & insist on 30mA devices at each location.

Yet another load of nonsense from the BGB then!! I'm sure that a static caravan owner/resident will fully appreciate having to go outside, braving torrential rain or a snow blizzard to reset an RCD!! lol!!

 

[gnselectricals]

Yet another load of nonsense from the BGB then!! I'm sure that a static caravan owner/resident will fully appreciate having to go outside, braving torrential rain or a snow blizzard to reset an RCD!! lol!!

Cest la vie !!