BS Codes

[johnboy6083]

It will matter as paul said, when close to limits, as the higher the voltage, the lower the current required to make the device trip, and the higher the Zs value allowed.
This is from the formula: If= Uo/Zs
Please correct if I'm on the wrong lines Paul.

 

[Silly Sausage]

Have a think and see what you come up with.

Not tonight!

I'll open myself up for a total flaming here, I can be quite blasé (within reason) when it comes to measured Zs values, but more of that later!

 

[Duncan Bennett]

Guys, I'm overwhelmed

 

[Silly Sausage]

It will matter as paul said, when close to limits, as the higher the voltage, the lower the current required to make the device trip, and the higher the Zs value allowed.
This is from the formula: If= Uo/Zs
Please correct if I'm on the wrong lines Paul.

Not quite, I think, Paul will put us right.
Breaker trips at a certain current, so to achieve that current, if Uo is lower, the Zs will have to be lower.


Explain this to me fellas...

Brown book Z esses



Red book Z esses




Why are the red book values lower than the brown, both @ 230V?



I'm going through some old notes at the moment, hence the BBB.

 

[netblindpaul]

I think a little more research is needed Archie, but IIRC the answer is out there...

 

[Silly Sausage]

Stop teasing me!
I usually allow for about a 20% measurement error, and that's when I'm in a good mood...