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I'm actually a bit confused what the actual question is and if it's been answered! ;-)
When you say it's for fault protection are you referring to the AFDD part of it, or meaning it's installed to provide ADS for an installation, e.g. a main switch or up front device on a TT system?
The time/current criteria is in Appendix 3 of 18th, page 363
Also see reg 643.8, note underneath.
However if it is for fault protection and providing ADS for an installation then chapter 41 applies.
If we can help more then feel free to tell us a bit more about how/where this thing is installed, and what you are unsure of. ;-)
When you say it's for fault protection are you referring to the AFDD part of it, or meaning it's installed to provide ADS for an installation, e.g. a main switch or up front device on a TT system?
,is there a reg No that determines those values please .
The time/current criteria is in Appendix 3 of 18th, page 363
Also see reg 643.8, note underneath.
However if it is for fault protection and providing ADS for an installation then chapter 41 applies.
If we can help more then feel free to tell us a bit more about how/where this thing is installed, and what you are unsure of. ;-)