Caravan Earthing, Higher impedance?

[whitenight639]

So I have a static caravan that has a hookup to the house, And I wanted to improve the earthing by installing one specifically just for the caravan,

So I have driven in around 4ft of copper pipe and used 30a capble to earth both the chassis of the caravan and the metal exterior, but upon checking the continuity and resistance the earting I have installed seems to have increased the resistance, Measuring with my new earth disconnected from the ground rod it measures 30 Ohms from an earth in a socket to the the caravan shell / exterior sheeting, with my new earth rod connected it measures 60 Ohms, now the hook-up runs around 15 metres to the garage and then into the house.

If electricity follows the path of least resistance than surely my readings must be wrong, right?

I don't have any fancy earth testing equipment just a multimeter, I'm not an electrician, I just wanted to improve the earth in the caravan mainly to add additional safety and protection from lightning / EMP.


Either there is a principle I am yet to understand or I am measuring it wrong, or have faulty reading, what do you guys think, and what should a good earth measure in Ohms or isnt it that simple, It's very strange because I added salt and water around the earth rod to check it and the resistance went from 60 Ohms to around 55 Ohms.

 

[44ALLAN]

No I do not want an eicr, this is not a leisure accommodation vehicle, its a meth lab (Joking).

it's 3 core armourflex burried 12ft deep and protected by laserbeams and tiny dragons, This forum is useless

What your doing could kill someone...........think who it might be mate.
Call a spark and do it properly fgs !

 

[shocking_eg]

why would you disconnect a decent TNC-s earthing system in favor of a crappy TT Rod i dont know !

 

[stuartcourt]

No I do not want an eicr, this is not a leisure accommodation vehicle, its a meth lab (Joking).




it's 3 core armourflex burried 12ft deep and protected by laserbeams and tiny dragons, This forum is useless

where did you get the dragons and what type as you may need additional smoke detection

 

[Adam W]

I'd leave it alone if I were you.

 

[shocking_eg]

where did you get the dragons and what type as you may need additional smoke detection

Lmao !!!!

 

[44ALLAN]

why would you disconnect a decent TNC-s earthing system in favor of a crappy TT Rod i dont know !

BS7671 - TNC'S is forbidden. 708 Special locations,

 

[shocking_eg]

BS7671 - TNC'S is forbidden. 708 Special locations,

This is a mobile caravan we're taking about here ... Right ?!?

 

[44ALLAN]

This is a mobile caravan we're taking about here ... Right ?!?

Static seemingly!

 

[markc123]

A static caravan is a static caravan no matter where it's situated.

The leisure accommodation vehicle its self comes under general regulations. But the connection / plot that its sited on comes under 708 special locations. Thus, making TNC-S not suitable for a leisure accommodation vehicle.

The regs are confusing at the best of times, not half when it comes to the do's and don'ts of caravans / tourers.

 

[Engineer54]

Well that's typical isn't it, the guy comes on here, asks for professional help/advise, gets it. Then has the cheek to turn round and tell you, your all useless!! Perhaps you should have told him everything is fine and dandy, he'd of gone away thinking, what a great bunch of guy's!! lol!!

I wouldn't waste anymore time with this idiot, he clearly has no interest in doing anything correctly or more importantly ''safely''!!

 

[power ranger]

People only like you and think you are good if you tell them something they want to hear! As soon as you say something and have an opinion that goes against their idea then you are seen as useless or just wanting to make a job BIGGER and are also classed as a rip off merchant.

Perhaps the OP might want to google "broken neutral on pme supplies" to start with and then come back and ask some more questions!

 

[PEG]

Danger? Conflict? This static sounds JUST the job for me! Can i book the first two weeks in August please?

 

[markc123]

Danger? Conflict? This static sounds JUST the job for me! Can i book the first two weeks in August please?

Haha. Yeah - just with the OP's clear disregard for the regs make sure you don't touch the metal framework when you're entering.

 

[UNG]

No the Caravan is supplied by 3 core so is earthed through that connection, the earth I have added is additional, I can't see how spending £900 on a fancy earth tester is worth it for one job, especially when my multimeter is capable of measuring impedance (I know im gonna get stick for this, so bad), obviously impedance is proportional to current and voltage but I can soon unplug everything and connact a 12v battery to the van and measure the current and impedance of the earth?

You seem to have an understanding of some things but can't understand why using the correct test equipment is essential

it's 3 core armourflex burried 12ft deep and protected by laserbeams and tiny dragons, This forum is useless

You are entitled to our own opinion of this forum as the members on here are entitled to our opinion of you two words spring to mind idiot and troll

 

[DPG]

blimey where to start !! forget testing with a multimeter you need an impedance tester and the knowledge to use it.
have you run a 2 core from the house supply and then earthed the van using an earth stake ?
im not gonna go into how you test the resistance for the earth stake which will give a Ra reading etc etc. maybe you should ask a sparky to carry out the correct testing.

I'm not sure you're the best person to be advising on this subject after yesterday's question you were asking. Daz