Mains Neutral and Earth connected.
Mains Neutral and Earth connected.
(OP)
Hello,
I have just designed an SMPS for bench use at work and was thinking about Earthing the chassis. However, when i metered the mains socket outlets i found that Mains Earth and Mains Neutral are connected together.
Does anybody know if this is supposed to be so?
I thought that any current in the earth wire was generally a bad thing.
Also, in relation to this, i wondered if anyone knows of a link for the circuit diagram from power station turbine output , right up to household mains socket? -I can't find it wherever i search. -Hopefully it would show all earth connections and transformers.
Anyway, i suppose for my place, common_mode_current and differential_mode_current are one and the same thing....does that mean i dont need any common mode filters?, e.g. those "balancing transformer types", where N1I1 = N2I2.
I have just designed an SMPS for bench use at work and was thinking about Earthing the chassis. However, when i metered the mains socket outlets i found that Mains Earth and Mains Neutral are connected together.
Does anybody know if this is supposed to be so?
I thought that any current in the earth wire was generally a bad thing.
Also, in relation to this, i wondered if anyone knows of a link for the circuit diagram from power station turbine output , right up to household mains socket? -I can't find it wherever i search. -Hopefully it would show all earth connections and transformers.
Anyway, i suppose for my place, common_mode_current and differential_mode_current are one and the same thing....does that mean i dont need any common mode filters?, e.g. those "balancing transformer types", where N1I1 = N2I2.






RE: Mains Neutral and Earth connected.
RE: Mains Neutral and Earth connected.
The one you have is a TN, probably a TN-C, aka four wire system. There are also TN-S systems, or five wire systems. In both cases the PE and N are connected together. And shall be so.
There are also IT systems. They have no neutral. So there is no N that can be connected to PE. And TT systems. Common in the US. I have never met one of those. At least not that I know about.
Gunnar Englund
www.gke.org
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