prEN IEC 63445:2024

This standard applies to a system referencing conductor switching devices (SRCSD) for household and similar uses within a Prosumer’s Electrical Installations (PEI).The SRCSD provides functions as described in clause 82.8.2.2.4 of IEC 60364-8-82 Ed1.
PEI intended for operating either being connected to a distribution network or being disconnected from the distribution network is an islandable PEI.
Intentional disconnection from and connection to the distribution network relies on the local earthing system being switched by the SRCSD. In addition, unintentional loss of distribution network is covered.
The SRCSD is a single pole device intended to connect one live conductor of the power system to an earthing arrangement.
In general the neutral conductor is earthed.
Switching the SRCSD can change the local type of system earthing, if types of system earthing are different in island and grid connected modes.
The system referencing conductor switching device (SRCSD) is interlocked with the switching device for islanding (SDFI) of a Prosumer electrical installation.
SRCSD can be integrated in a device with other function e. g. with a SDFI.
NOTE 1. see also IEC 60364-8-82 ED1.
This standard applies to SRCSD for rated voltages not exceeding 440 V AC with rated frequencies of 50 Hz, 60 Hz or 50/60 Hz.
NOTE 2. SRCSD for DC operations is under consideration.
The requirements of this document apply for standard environmental conditions. They are applicable to SRCSD intended for use in an environment with pollution degree 2 and overvoltage categories III according to IEC 60664-1:2020. SRCSD have at least a degree of
protection IP 20 according to IEC 60529. Additional requirements can be necessary for devices used in locations having more severe environmental conditions.