|20th September 2019, 01:24 AM||#31|
Join Date: Jun 2003
Location: Maine USA
> PME acronym, I am not familiar with this particular naming
I think some of these fine distinctions, you have to go in the box or up the pole/down the manhole to appreciation the differences.
Earthing system - Wikipedia
"PME" seems to be UK jargon. Depending exactly where the splices go, it seems to be "similar" to how we try to do it in Maine (in the whole USA). There's a dirt-rod on the power poles, there's a dirt-rod at the house(?), and part of the feeder is combined N/G (PE) function.
Oh, I suppose the US way is more like TN-C: N and G are not split until the main fusebox, "Consumer". (And most homes are '2-phase' not 3-phase.)
The main difference seems to be: in some systems the consumer gets Dirt-Rod (Ground, PE) ONLY from the company, in others there is a dirt-rod at the customer. In almost all cases the company is full of dirt-rods. In a system with Multiple Earths, the ground currents can be unpredictable.
This may matter to amateur radio which can really depend on ground currents to launch longer wavelengths. It shouldn't have a large effect on a domestic hi-fi.
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