Raymond asked:
What is the difference between neutral and ground wires?
Our Answer:
Let’s start by getting the terminology down:
The reason for the neutral wire is to carry electrical currents back to the transformer during normal operations, in a manner that keeps those hazardous electrical currents away from people and exposed metal objects.
The reason for the ground wire is to eliminate any differences in potential on the exposed metal objects you might touch, and to carry return currents back to the transformer in case of an electrical fault (the unintentional contact of electrical currents to exposed metal objects).
In regards to the grounding electrode connection, a simple receptacle tester would not detect the presence of a ground rod, it only checks to see if the ground spade of the outlet is in an open condition (high resistance).
Of interest is that your electrical system should function safely even if your entire structure were lifted into space. The physical grounding wires would ensure that your electrical circuit breakers would still trip, even if you had no grounding rods and were not connected to the earth at all. The reason for the ground connection has to do with the needs of your local utility company, and a need to remove stray harmonics and other forms of objectionable current.
In the International Electrical Code (IEC) they call a ground wire a “Protective Earth” or PE. The Neutral is called a “Neutral” or N. When the power company only brings over normally current carrying wires (phase and neutral only), they call the neutral wire a “PEN conductor”, because it is both a Protective Earth (PE) AND a Neutral (N). They define this type of electrical system as a “Combined” or C. Meaning that the neutral and protective earth is Combined. When you split the neutral and PE into two separate entities, they call it a Separated or S system. When the power company bring over a PEN conductor and you split it into two in your electrical cabinet, they call that electrical system a C-S, or “Combined then Separated” system.
The Engineering Experts at E&S Grounding Solutions