RCCB tripping but no MCBs have tripped.

[RDB85]

I’ve a Square D Split load RCCB board that has a strange issue. The RCCB trips and none of the MCBs seem to trip.

The only thing that has recently been done is replacing the sockets and switches. I’ve tested each socket with a socket tester and it was showing as correct on all sockets. I only had to extend two which I brought up in a a previous thread and used some 5 way Wago connectors.

Any ideas what it could be? As none of the MCBs have tripped. It only seems to happen of a night.

 

[RDB85]

Hopefully it is something simple. I do always check my cables. Maybe Ive missed something:

Ive seen these two Meggers:

Megger Mft1721 Multifunction Tester | 020200158531 | Cash Converters - https://www.cashconverters.co.uk/shop/tools-motor--hardware/power-tools--industrial/multimeters--electrical-testers/multimeter/020200158531

Meggar Multifunction Installation Tester | 046900089385 | Cash Converters

Features: -has a simple colour-coded test selection -large clear backlit display for ease of use -two wire non-trip loop testing for fast repeatable results -3-phase RCD testing for industrial applications with no earth and 3-terminal earth testing for electrode resistance measurement -has an...

www.cashconverters.co.uk

Metrel:

Metrel Eurotest Easi, MI3100 S, Multi function tester. | eBay

Find many great new & used options and get the best deals for Metrel Eurotest Easi, MI3100 S, Multi function tester. at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

 

[telectrix]

that megger is a steal. at that price. snatch it while you can. only drawback i see is it does not appear to have auto RCD test

 

[Strima]

it does not appear to have auto RCD test

I think it does, the pictures a bit blurry...

 

[RDB85]

that megger is a steal. at that price. snatch it while you can. only drawback i see is it does not appear to have auto RCD test

that megger is a steal. at that price. snatch it while you can. only drawback i see is it does not appear to have auto RCD test

Which one Tel?

 

[loz2754]

Middle one is a 1710 and does not have RCD auto test.

 

[RDB85]

All sorted. One of the neutrals was snagged. I’ve seen a Kewtech KT64DL for £200 online. But I may wait as there is a KT65DL on s bid starting at 99p.

 

[Avo Mk8]

Middle one is a 1710 and does not have RCD auto test.

Just to add the 1710 was a "17th edition tester", design now 10+ years old, is discontinued, and now superseded by 1711.
Not convinced it would be the best option, even though I am a Megger fan!

 

[RDB85]

The KT64 does seem okay for the price the KT65 is £650 to buy but it’s currently on an Auction for a week. It would probably get close to that. I unsure what to do.

 

[Mike Johnson]

I'm a Fluke fan myself and for £650 you could get a top of the range 1664fc which is what I would go for.

This 1663 is one down from the 1664fc so does not have the auto test function, but still a good MFT @ £575: FLUKE 1663 Electricians Mulitfunction tester with new calibration certificate | in Barnet, London | Gumtree - https://www.gumtree.com/p/other-hand-tools/fluke-1663-electricians-mulitfunction-tester-with-new-calibration-certificate-/1420909546