Discuss MAX Zs with 61009 in the UK Electrical Forum area at ElectriciansForums.net
Why do we have maxuim Zs for 61009 RCBO's? I didn't think Zs values really mattered if the circuit was covered by and 30mA RCBO/RCD?
It's not right to say the ZS 'doesn't matter', even where there is RCD protection.
I do get a bit confused with when 30mA protection is classed as additional protection and when it is not. However, in the case's where it is classed as additional protection and ADS is the means of fault protection then the RCBO clearly has to meet the max Zs figures otherwise you are not adhering to the regulations.Why do we have maxuim Zs for 61009 RCBO's? I didn't think Zs values really mattered if the circuit was covered by and 30mA RCBO/RCD?
Yeah fair enough. Can you explain why the Zs is still relevent ?
Because theses are the values that you should work to,especially on tn systems.I see... So you use the measured zs value ( or r1 r2 ) to work out the length of the circuit ( of the line an neutral conductor) and then use the Adiabatic equation to calculate if the short circuit fault condition will comply?
Why do we have maximum Zs values in the regs for RCBO's / RCD's ?
Thanks for your help
Reply to MAX Zs with 61009 in the UK Electrical Forum area at ElectriciansForums.net
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