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Home / Technical Articles / When can we say that earthing arrangement is safe for people (confusions in practice)

Earthing is not just ‘Earthing’

This article will analyse some of the most important safety issues related to design and use of LV electrical installations. Besides explanation of relevant terms in this field defined by IEC standards, some misinterpretations and confusions which may be seen in practice will be illustrated and clarified.

When can we say that earthing arrangement is safe for people (confusions in practice)
When can we say that earthing arrangement is safe for people? (on photo: An old earthing bar in LV switchgear; photo credit: Richard Cadena)

Table of contents:

  1. Introduction and basic terms
    1. Lightning strike
    2. Electric arc
    3. Direct contact
    4. Indirect contact
  2. Earthing arrangements and efficiency of protection
    1.  TN earthing arrangement
    2. TT earthing arrangement
    3. IT earthing arrangement
  3. Additional comments and FAQs

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Miodrag Kokotovic

Graduated from Faculty of Electrical Engineering, within University of Belgrade, in the field of electrical power systems. Expert in electrical part of tender preparation, design, procurement, construction and commissioning of treatment plants and pumping stations, electrical power quality and energy management.

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