Earthing and RCDs in two wire system countries.

[nannoo]

Hi all. I hope it's not rude to post a question straight away ?

I've been living in Cambodia now for several years. There's recently been a lot of guys from the U.K coming over and setting up home.
The electrics here are sketchy but functional. Polarity is hit and miss, no earthing and generally one breaker (mcb) running several circuits.
Where would you stand on supplying an installation with an earth from a TT system. Driving a spike supplying a 100ma RCD, supplying a 30ma rcd at the installation ?

Thanks for any replies, I'm well out of touch with the technical aspect of this question.

 

[Farmelectrics]

welcome nannoo

 

[trev]

Welcome aboard, without knowing more about the supply system I'm reluctant to advise mate.

 

[nannoo]

Thanks farmelectrics.

 

[trev]

Do you have a permanant supply coming from an earthed transformer somewhere near you?
If so then it's going to be the same theory as a UK TT nice low, stable Ra. S type RCD etc etc

 

[nannoo]

Hi Trev,

Thanks for the reply. It's a two wire, 220v 50 hz supply. Sorry for the lack of details. It's generated by diesel generators, and as such suffers from quite large voltage irregularities.

I'll do a little more research and fill in the details after I've tried speaking with the electrical authority.

 

[Engineer54]

Hi Trev,

Thanks for the reply. It's a two wire, 220v 50 hz supply. Sorry for the lack of details. It's generated by diesel generators, and as such suffers from quite large voltage irregularities.

I'll do a little more research and fill in the details after I've tried speaking with the electrical authority.

God, ...You must be way out in the sticks!! lol!!

 

[nannoo]

God, ...You must be way out in the sticks!! lol!!

It's not so bad. There are rumours of a civilization somewhere within a hundred miles

 

[La Poste]

Would the generators have an earthed neutral I wonder?

A neutral physically connected to earth by a rod?

I remember Marvo wrote a post for a guy living in Romania or Bulgaria where he advised to put a big rod in at the origin of supply to the property and then connect the neutral to it.

Then he said to run a CPC around the property and join the CPC to the neutral at the origin of the supply where the rod is so everything is tied down to earth via the rod, the neutral and the CPC, a kind of DIY TN-C-S with a grounded neutral at the property.

I think that's how he explained it.

Edit:
http://www.electriciansforums.net/n...901-unusual-foreign-electrics.html#post479766

 

[StuSpiers]

Hi all. I hope it's not rude to post a question straight away ?

I've been living in Cambodia now for several years. There's recently been a lot of guys from the U.K coming over and setting up home.
The electrics here are sketchy but functional. Polarity is hit and miss, no earthing and generally one breaker (mcb) running several circuits.
Where would you stand on supplying an installation with an earth from a TT system. Driving a spike supplying a 100ma RCD, supplying a 30ma rcd at the installation ?

Thanks for any replies, I'm well out of touch with the technical aspect of this question.

I would suggest you visit this forum:

Do it yourself housing forum - Thailand Forum

Now it is for Thailand but so far as I can tell you roughly share the same system.

A chap called Crossy Crossy - Viewing Profile - Thailand Forum will be able to help you.

He is from UK but is living in Thailand and is very knowledgeable when it comes to Generators.

Regards.

 

[nannoo]

Thanks for the reply la Poste,and the link to the thread. Much obliged.

 

[nannoo]

Thanks a lot for the links and information StuSpiers, they're very useful. Much appreciated. I'll have a good ferret around.

All the best.

 

[La Poste]

Thanks for the reply la Poste,and the link to the thread. Much obliged.

Don't do anything until you have taken pictures and spoken to some of the more senior members on this site.

I'm not a full time Sparks, just an enthusiast.

 

[nannoo]

Ok, noted. Thanks nonetheless.