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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 11:52 am
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chrispearson

Posts: 1095
Joined: 15 February 2018

Mike has outlined the physics above, but I would expect RCDs and RCBOs to trip other than on three lead low settings. What you describe is normal. Up until 18th, one might have had the luxury of doing the much faster 2 Hi on lighting circuits, but now with RCD protection domestically, you just have to put up with your outstretched arms aching until the MFT does its thing.
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