Recent content by Carl TDR

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MAX Zs with 61009

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 ...
- Carl TDR
- Post #9
- Dec 4, 2019
- Forum: UK Electrical Forum
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MAX Zs with 61009

Okay, that makes sense. The Zs of a circuit can give more information about the state and condition of a circuit. But what I don’t understand is “Why do we have maximum Zs for 61009 RCBO's?” As an example: A TT install has a Ze of 55.0 ohm. The Maximum Zs for a 63A type C RCBO is 0.27 ohm…...
- Carl TDR
- Post #7
- Dec 4, 2019
- Forum: UK Electrical Forum
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MAX Zs with 61009

Yeah fair enough. Can you explain why the Zs is still relevent ?
- Carl TDR
- Post #4
- Dec 4, 2019
- Forum: UK Electrical Forum
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MAX Zs with 61009

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?
- Carl TDR
- Thread
- Dec 4, 2019
- max rcbo rcd
- Replies: 8
- Forum: UK Electrical Forum

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