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Topic Title: Low current Zs test tripping RCBO
Topic Summary:
Created On: 24 March 2019 08:53 pm
Status: Read Only
Linear : Threading : Single : Branch
 Low current Zs test tripping RCBO   - Sparkymania - 24 March 2019 08:53 pm  
 Low current Zs test tripping RCBO   - mapj1 - 25 March 2019 09:24 am  
 Low current Zs test tripping RCBO   - chrispearson - 25 March 2019 11:52 am  
 Low current Zs test tripping RCBO   - RB1981 - 25 March 2019 03:26 pm  
 Low current Zs test tripping RCBO   - KFH - 25 March 2019 04:37 pm  
 Low current Zs test tripping RCBO   - RB1981 - 25 March 2019 04:41 pm  
 Low current Zs test tripping RCBO   - Sparkymania - 25 March 2019 08:03 pm  
 Low current Zs test tripping RCBO   - mapj1 - 25 March 2019 09:14 pm  
 Low current Zs test tripping RCBO   - Sparkymania - 25 March 2019 09:29 pm  
 Low current Zs test tripping RCBO   - AJJewsbury - 26 March 2019 09:34 am  
 Low current Zs test tripping RCBO   - Sparkymania - 26 March 2019 10:46 pm  
 Low current Zs test tripping RCBO   - Sparkymania - 27 March 2019 06:55 pm  
 Low current Zs test tripping RCBO   - RB1981 - 27 March 2019 08:02 pm  
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 25 March 2019 08:03 pm
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Sparkymania

Posts: 6
Joined: 24 March 2019

Thanks for the replies everyone.

It looks like, then, it was a peculiarity with the RCBOs. Something about them didn't like the 2 wire. They were all fairly new MK. It was a refurbed staff rest area in council offices with all new circuits and a 3rd amd SPN DB. The 12 circuits were short as it was an area of WCs sitting room and kitchen, therefore the capacitance to earth would have been minimal. Non or the other RCBOs feeding FCUs in the building had this problem and they were tested 2 wire low even though they had a neutral available. It was just these MKs that had the issue.

Still, I don't see why this would happen as the tester is only supposed to pass a 15mA test current on low whether 2 or 3 wire. From my understanding the 3 wire low is used, were possible, as it is supposed to be more accurate than 2 wire low, not because 2 wire trips the RCBO.
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