Earthing Principles

When considering a UPS installation, it is important to take into account the power system and the earthing requirements. For safety reasons proper UPS earthing is a must in case of a short circuit ensuring that a loop circuit is established for the fault current to return to its origin and thereby make the OCPD operate.

The following is based on the standards given in IEC 60364 and relates to the installation and earthing principles of the UPS systems from Schneider Electric.

According to the standards given in IEC 60364 all power systems are divided into three earthing types: TN, TT, IT.

NOTE: The UPS installation must always comply with local and national regulations, and some countries have exceptions to the IEC 60364 standard.
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