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Topic Title: TT questions
Topic Summary:
Created On: 25 September 2017 01:42 PM
Status: Read Only
Linear : Threading : Single : Branch
 TT questions   - jonny705 - 25 September 2017 01:42 PM  
 TT questions   - leckie - 25 September 2017 02:58 PM  
 TT questions   - Legh - 25 September 2017 03:02 PM  
 TT questions   - leckie - 25 September 2017 03:07 PM  
 TT questions   - Legh - 25 September 2017 04:52 PM  
 TT questions   - leckie - 25 September 2017 05:43 PM  
 TT questions   - jonny705 - 25 September 2017 04:22 PM  
 TT questions   - Legh - 25 September 2017 06:09 PM  
 TT questions   - AJJewsbury - 25 September 2017 06:15 PM  
 TT questions   - mapj1 - 25 September 2017 10:18 PM  
 TT questions   - jonny705 - 26 September 2017 11:16 AM  
 TT questions   - mapj1 - 26 September 2017 01:38 PM  
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 25 September 2017 01:42 PM
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jonny705

Posts: 157
Joined: 26 September 2015

Can anyone shed some light on why my readings on TT system ring final circuit almost are all the same? I have tested some spiked systems and still find it strange to look at the Zs figures and see things like 25.6 or yesterday 55ohms

But since testing these there is virtually no difference between the socket to the point of me thinking its pointless- the reading s for example : 55.3/55.3/55.3/52.4/55.5/52.4/55.3, now I know that no trip tests are a bit vague , but should I just do ZS by calculation via dead testing on test sheet instead - is it likely to me more accurate?

Also I was thinking about the fact the max Zs figures are meaningless as such on a TT system because of the RCD , but what would happen on a new install if the R1/R2 figures exceeded the max allowed ZS figures would it matter?

And finally what or how before RCD's or anything like that existed , how would the fuse ever blow quick enough if the Impedance was so high?
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