neutral / ground connected?

I looked at one of my ceiling fixtures and noticed, that there is 0 Om (no resistance) between the neutral (white) wire and the ground connection (the gas pipe, etc).

Is it expected? Or I need to try and find place, where ground and neutral connected? It could be in any of the wires or connections in my house. Or any other house, which connected to the same neutral and cold water pipes.

By bobjohn |