Originally Posted by Stubbie
Ok I read through it and find it very similar to the US. I have to admit I had to blow the dust of my metric conversion chart to get a grasp of the sizes of your earthing electrodes outside the simple stuff like 16mm. this is the standard size for our rod electrodes. I did notice for a horizontal installation they require the rod to be 3 meters in length, thats a bit over half meter longer than our code requires for the same. We can however install above code and bury or drive longer ones or more than required. It just isn't very practical. As you have to make your own if going longer than 10 feet. A 10 foot rod is available but uncommon in residential applications.
Anyway thanks for the stuff on the way you earth..
It may interest you that I see you have jumped to using the term earthing where it differentiates from grounding. The NEC is finally going to do the same in 2008 after confusing the heck out of us for years
Thanks for your time & patience Stubbie
. I too am not here to proclaim the superiorities or inferiorities of either countrys' electrical codes. I am more concerned with the technical application of certain systems.
Ok...now that I think I have digested what is going on, am I correct in understanding that upon the installation of an earthing system, the installer (electrician) must designate what shall be used as a part of the earthing system? If so, do the designated systems have to be tested to ensure correct electrical operation, before being used? It is my understanding that water pipe cannot be used unless it is a proven part of the earthing system?
In any case, it would not be my choice to use anything other than an installed earthing system (earth cabling/wiring) to facilitate a good earth to any device/appliance.
Thanks again for your understanding.
I did notice something in NEC about not using rebar as part of the earthing system if the connection to the system is not accessible (covered in concrete). Many Thai electricians currently use this method, which is outlawed in Thailand.
Also, Thailand has a shocking (literally) electrical system. It uses the TT distribution system (same as Australia) but most Thai electricians seem to continue to do things according to some old (or outdated) US method/code. I am in no way suggesting that the US method is faulty but I am suggesting that mixing 2 different codes/systems is dangerous. The current Thai system is in no way similar to the US system whereas it may have been similar many years ago.