IEC 60947-9-1-2019 pdf free.Low-voltage switchgear and controlgear – Part 9-1: Active arc-fault mitigation systems -Arc quenching devices.
Parts of insulating materials necessary to retain current-carrying parts in position shall becompatible with the maximum permissible main circuit terminal temperature declared by themanufacturer (see item 17 of Table 1). Where, in of IEC 60947-1:2007,IEC 60947-1:2007/AMD1:2010 and lEC 60947-1:2007IAMD2:2014, the test temperature is tobe specified, the value required by this standard is 850 °C.
AQDs shall be provided with a local indicator showing the state (open or closed) of the device.This indicator shall be visible when installed and with the AQD compartment door open. Thisinformation shall also be available remotely,through an auxiliary contact or equivalent, toprovide electrical interlocking with the upstream sCPD.
NOTE 1 This interlocking is to ensure that the circuit protected by the AQD cannot be re-energized until thedevice has been replaced. re-opened or reset.
NOTE 2 One or more additional auxiliary contacts can also be provided for optional interlocking with otherdevices, such as the external detection device.
Single shot AQDs able to be re-opened after operating shall be provided with an additionalindicator showing,after re-opening,that the device is “open”,but not ready to operateanymore. This indicator shall be visible when installed and with the AQD compartment dooropen.
Resettable AQDs shall be provided with means to count the number of operations. A means toindicate that the maximum number of operations has been reached shall be provided in thatcase.
AQDs that have provisions for disabling the quenching function shall have provisions for localand remote indication that the device has been disabled.
lf AQDs contain items that have stored charges after disconnection from the power supply(capacitors,etc.), means shall be provided either to prevent access to these items duringnormal service, or to discharge them before access is possible. This requirement does notapply if the stored charges voltage falls below 60 v DC in less than 5 s after disconnectionfrom the power supply.
8.2Performance requirements
Subclause 7.2ofIEC 60947-1:2007, IEC 60947-1:2007/AMD1:2010 and
IEC 60947-1:2007/AMD2:2014 applies with the following modifications:
The maximum operating time shall comply with the value stated by the manufacturer.
lt shall not be possible to reset a resettable AQD while the triggering signal is present.
As AQDs do not permanently carry current,the temperature-rise requirements of ofIEC 60947-1:2007 for the main circuit do not apply.IEC 60947-9-1 pdf download.