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Great Wall
David5o:
Vince,
Sure they need to be grounded with ground rods!! ... lol!!
Your NEC code is a bit light on grounding compared with most of Europe. Your code calls for a standard ground rod, if when tested value exceeds 25 ohms install one more rod .... no need for further testing. In Europe and most other western countries the value is a fixed minimum 1ohm !!! So if your on rocky substructure, start thinking in multiples of rods or copper grids. For me, i'm more than happy in a lightning protection system, to see a 5 ohm reading.
David.....
Vince G:
So Dave you know the NEC codes? I'm surprised. Almost all the homes and buildings here have the rods. People just don't know it.
David5o:
Vince,
Yes i know the NEC codes, I've had to work with them many times, mostly in the Middle East. The big difference between your codes and the British regulations, is that you allow interested parties (manufactures, contractors etc) influence over the rules in the codes. Where the British Reg's are influenced by professional institutions. Which is why you have so many exceptions to a given code rule, sometimes almost making that rule non-existent!! haha!!
I must admit, some of your Electrical guidance books are pretty useful. eg the green, red, buff, orange, books. I can't remember the full names of them but they normally go by the colours of the books anyway. Also, i think now, you are the only country in the world that's not using metric sized cables, So your codes are becoming less adopted worldwide now, as there are no metric equivalents to your AWG cables and wires.
I know i seem to be knocking your systems, i'm not really it's just fact, of what is going on elsewhere in the world. Another example of differences. Your light switches and there back boxes are 3 times larger than the equivalent UK/Euro switches and back boxes. In fact your 2 gang light switch back box, ...for the same sort of size of box, we can get an 8 gang switch plate into. Whats even crazier, your single switch box isn't really big enough for those monster sized toggle type switches you use there. The times I've seen electricians have blow outs taking a live switches out of it's box, with the exposed side terminals touching the grounded box.
Oooooop's i think i'm writing too much here,.... sorry i got carried away!! haha!! But yes i have worked with your NEC codes on many projects..... lol!!
David....
Arnold:
When Qing comes over , I'll need those Rods installed . Because of all the Electricity that is going to be generated between us . There will be some sparks flying and need those Ohms guided into the ground .
David5o:
Arnold,
Then the less ohms the better then!! ...haha!!
David.....
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