What is the IT System?
What is the IT System?
IT System Definition
IT system has its source either isolated from Earth or connected to Earth through an impedance (such as a resistor or an inductor). The consumer’s installation is connected to the earth through one or more local electrodes. These electrodes do not have any direct connection with the source.
IT System Advantages
Eliminates any risk of electric shock due to first faults on live conductors because there is no return path through Earth.
Allows for continuity of supply even in case of first faults because there is no automatic disconnection required.
Reduces interference and overvoltage problems due to capacitive coupling between live conductors and the earth.
IT System Disadvantages
Requires special monitoring devices such as insulation monitors or fault detectors to identify first faults and locate them before they become dangerous second faults.
Requires additional protection devices such as RCDs or voltage-operated ELCBs to ensure a reliable disconnection in case of second faults.
May result in higher touch voltages on exposed metal parts due to higher capacitance between live conductors and the earth.
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