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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 09:14 PM
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mapj1

Posts: 12039
Joined: 22 July 2004

Ah well a 30mA RCD or RCBO must fire by 30mA and is allowed to fire at anything above half of that. Normally they pop off at 20-25mA but you do see the odd nearer 17 to 18 and it may be that your 15mA nominal test is actully 10% high I suppose. Put it down to a frisky batch of breakers.

-------------------------
regards Mike
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