The different groups are then earthed individually. In Groups: Different loads are separated into groups and then the chassis of each load in a group is interconnected with the other chassis within the same group.Individual: The chassis of each load is earthed separately from the neighboring load chassis.The term that follows the IT earthing types are defined as follows:.The second letter, T, is defined by “Terre” which defines the load chassis as connected to earth using an earthing electrode.The first letter, I, is defined by “Isolated” which defines the neutral as is either not connected to earth or indirectly connected to earth through a high impedance.The earthing type for an IT system is marked by using 2 letters and a term:
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As soon as the customer’s service entry point is crossed, the earthing conductor will separate into two separate conductors, which are the neutral and the PE conductors. The TN-C-S start from the source (such as a utility company) with a combined PEN conductor until a service entry point, e.g. The TN-C-S earthing type has four letters and the fourth letter, just like the third letter, indicates how the neutral and PE conductors are utilized.S is defined by “Separated” which means that the neutral and PE conductors are separated and independent from each other.C is defined by “Combined” which means that the neutral and PE conductors are combined into one conductor (PEN conductor) that acts as the current return conductor during both steady state and fault conditions.The third letter indicate how the neutral and PE conductors are utilized.This gives a TN system, which is how the load chassis is connected to earth using either a neutral or a protective earthing (PE) conductor. N is defined by “Neutral” which defines the load chassis as connected to neutral.T is defined by “Terre”, which gives a TT system, which is the how the load chassis is grounded to earth using an earthing electrode.Specification for Power System Analysis.Cloud - Collaborative Project Management - NetPM.Leverage Analytics with a Unified Digital Platform Microgrid Controller & Energy Management - µGrid.Electrical SCADA & Control System - eSCADA.Relay Protection & Asset Management - eProtect.Digital Substation & Automation System - SAS.Advanced Distribution Management System - ADMS.Automated Protection & Coordination - Star.