Modern wiring help rcd trip

telectrix

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• Aug 17, 2019

• #2

is it the RCD that rips or the MCB that's switched off in the pic?

 

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telectrix

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• Aug 17, 2019

• #3

meant trips. 5 blllody words/

 

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RutlandFox

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• Aug 17, 2019

• #4

The rcd trips after a few mins. The circuit is isolated just in case though there's nothing plugged in at the moment. It's not the mcb tripping overcurrent.

 

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RutlandFox

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• Aug 17, 2019

• #5

Ok just tested rcd. 1x 34ms 43ms. 5x 6.8ms 12ms. Trip current on fault circuit 21mA. Trip current on other circuits 24mA. It's a 30mA rcd. Zs at socket 0.45 ohm 534A.

 

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telectrix

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• Aug 17, 2019

• #6

you could try moving the suspect circuit over to the other side and fit a RCBO.
assuming the 45A is shower, this could do with moving to the RCD side. winner both ways.

 

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RutlandFox

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• Aug 17, 2019

• #7

45A is cooker. It's a rental property that they have just moved into and I'm here on holiday so a bit loath to start rewiring it! Was just after things to look for fault finding. Does 24ma seem low for the trip current?

 

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pirate

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• Aug 17, 2019

• #8

In the socket picture, what do you call the connector? I haven't seen that before.

 

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Midwest

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• Aug 17, 2019

• #9

Wonder where thats been connected?

 

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pirate

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• Aug 17, 2019

• #10

Just curious. It looks like a pre-made connector, designed to slip into the cavity wall behind the back-box, but it must be at the end of the circuit, so not much use anywhere else unless you can connect the next socket somehow, Either way, it looks like you need two sets of connections for the socket...rather than just connecting the cable direct to the socket outlet?

 

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buzzlightyear

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• Aug 17, 2019

• #11

RutlandFox said:

45A is cooker. It's a rental property that they have just moved into and I'm here on holiday so a bit loath to start rewiring it!

Click to expand...

if it was me I would put the lid back on and call the landlord .

 

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RutlandFox

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• Aug 17, 2019

• #12

Yeah weird wiring. All circuits are radial 20A. No RM here. But each socket has one wire going in only. So there must be a JB in the cavity somewhere.

Anyway whacked a new RCD in, see what occurs.... thanks for all the replies.

 

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Risteard

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• Aug 17, 2019

• #13

As above, if this is a rental property then under no circumstances should you be interfering with the electrical installation without the landlord's consent.

The landlord/landlady should be contacted to organise his/her own Electrician.

 

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pirate

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• Aug 17, 2019

• #14

If each socket has just one cable, per the photo, and each one has these "connectors" then clearly there must be a JB, or perhaps several, somewhere. So instead of a supply cable looping in and out we have a JB supplying several sockets, each of which has one of these connectors? So we have 3 terminations per socket? Thus we have extra points of connection that can go wrong? Each socket will be traced back to the JB for fault finding? I do see the logic in this system, and can see an advantage or two, but in reality it seems like a bit of a faff. If those plug-in chaps can't take another cable, you would have to extend the circuit by using the terminals on the socket outlet itself, per usual...and if you feed say 10 sockets from a JB or some other connection outlet, you have a kind of spiders web effect, rather than a true radial?
Just asking...keen to learn.

 

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MDJ

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• Aug 17, 2019

• #15

On a different subject I have to say the insulation on the phase conductors where they terminate into the OCPD s are damaged lol, a steptoe and son job

 

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