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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 09:29 PM
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Sparkymania

Posts: 6
Joined: 24 March 2019

If the tester were 10% high then I'd see problems with other RCBOs. I also used another tester to check if it was the tester gone out of calibration but that tester done the same thing.
Frisky breakers. There were 12 of them all doing the same thing. I'm wondering what would have happened if they had been put on a circuit with high earth leakages if the can't handle 15mA test current with no loads on.
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