Max Zs permitted values..

[davie2876]

Hi guys n gals think I messed up my last post as it be gone... Anyhow got a question C32 30Ma 10k RCBO on a standard final ring with the same supply characteristics as ANOTHER final ring off the Db 6 inches from it...
Live been going through the O/M manual and found the test sheets and these 2 IDENTICAL circuit have different max permitted Zs values..... One is 1001 the other 0.6???? Am I being stupid as the are wired in same cable using same method doing same thing fed from same supply???? Anyone shed any light??

 

[Leesparkykent]

Hi guys n gals think I messed up my last post as it be gone... Anyhow got a question C32 30Ma 10k RCBO on a standard final ring with the same supply characteristics as ANOTHER final ring off the Db 6 inches from it...
Live been going through the O/M manual and found the test sheets and these 2 IDENTICAL circuit have different max permitted Zs values..... One is 1001 the other 0.6???? Am I being stupid as the are wired in same cable using same method doing same thing fed from same supply???? Anyone shed any light??

what do you think the maximum permitted ZS is?

 

[davie2876]

I thought it was 0.57 for 17th

 

[davie2876]

And lee I ain't saying what I read is totally wrong etc I'm just curious as to thoughts or if I've missed something as ive dissected this but can't get my head round it

 

[Pete999]

what do you think the maximum permitted ZS is?

Do you mean both identical RFCs have different MEASURED Zs

 

[Leesparkykent]

Do you mean both identical RFCs have different MEASURED Zs

You sure that quote is for me Pete lol.

 

[Pete999]

You sure that quote is for me Pete lol.

No so sorry Lee meant for the OP I have only just had my first cuppa with me meds so not quite on this planet just yet, be OK in a bit though lol

 

[Jonspark]

Do you mean both identical RFCs have different MEASURED Zs

hes's talking about max permitted values that are written down on his test sheet.

 

[Jonspark]

the max permitted value for these circuits should be 0.72 the 1001 figure could just be a mistake.

 

[spark 68]

Hi guys n gals think I messed up my last post as it be gone... Anyhow got a question C32 30Ma 10k RCBO on a standard final ring with the same supply characteristics as ANOTHER final ring off the Db 6 inches from it...
Live been going through the O/M manual and found the test sheets and these 2 IDENTICAL circuit have different max permitted Zs values..... One is 1001 the other 0.6???? Am I being stupid as the are wired in same cable using same method doing same thing fed from same supply???? Anyone shed any light??

I wonder if the first figure should read 1667 ?, maybe two different operatives ? and one has put the max Zs for the RCD part and the second has put the max Zs for the MCB part ? just a thought.

 

[Charlie_]

I wonder if the first figure should read 1667 ?, maybe two different operatives ? and one has put the max Zs for the RCD part and the second has put the max Zs for the MCB part ? just a thought.

This sounds most likely... 1667 badly written could look like 1001