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Electrical Earthing Systems - This excellent link from Wikipedia, the free encyclopedia is an excellent reference on electrical earthing and grounding.  It includes information on Low-voltage systems, IEC terminology, TN networks, TT network, IT network, Safety, Regulations, Application examples, Medium-voltage system, Solid-earthed neutral and Unearthed neutral.

Earthing in Low Voltage Systems - Covers Earthing connections, Definition of standardised earthing schemes, Characteristics of TT, TN and IT systems, Selection criteria for the TT, TN and IT systems, Choice of earthing method – implementation and Installation and measurements of earth electrodes - from Schneider Electric .

Understanding Neutral versus Ground when applying RFI filters in Electrical Equipment Installations - The grounding of electrical equipment is probably one of the least understood aspects of electricity. As the characteristics of electrical equipment changes from linear to non-linear, the nature of grounding expands from the task of insuring the safety of personnel to insuring that one type of electrical equipment does not interfere with other types of electrical equipment. One point for confusion rests with the often interchanged terms of Neutral and Ground. Many articles have been written concerning the problems with 3rd harmonics overloading the neutral conductor. Many articles have been written concerning the problem of electrical ground noise. Even with all these articles, there still exists confusion concerning whether equipment should be connected to the neutral or connected to a ground. It may be possible that a simple rule would clarify the differences between Neutral and Ground. It can be stated that Neutral can be grounded, but Ground is not neutral. From Rockwell Automation.

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