MCCB with RCD settings

[Bradley6969]

MCCB with RCD bolt on, anyone know how to work these settings out? Ignore settings now but this is upfront RCD TT system so I want to top one to be 0.3 for 300mA but unsure on bottom?

 

[telectrix]

not seen one of these before, but it loks like the topdial is for the tripping current, and the bottom one for the required tripping time.

 

[Deleted member 26818]

Yes, as Tel says, it’s the delay setting.

 

[Bradley6969]

Thanks so tripping current would be 0.3 which is 300mA? Unsure on bottom how to set

 

[snowhead]

Top one is currently set to 500ma
Bottom one is currently set to 500ms.

 

[Bradley6969]

Top one is currently set to 500ma
Bottom one is currently set to 500ms.

Yes I know lol not set it yet, obviously it’s upfront RCD so for discrimination I’m gonna set to 300mA as various other panels have 100mA but how would I set ms

 

[telectrix]

Yes I know lol not set it yet, obviously it’s upfront RCD so for discrimination I’m gonna set to 300mA as various other panels have 100mA but how would I set ms

put a screwdriver in the slot and turn it..

 

[The Ghost]

As a matter of interest, why does it need to be changed?

 

[Deleted member 26818]

Disconnection time for TT distribution circuits is 1s.

 

[DPG]

I not sure I understand the question. You do realise that the time setting on the device is marked in seconds, and so you need to convert milliseconds to seconds?