Safe T Cut issuses

[kwonitoy]

With some hard rainstorms happening here in Udon Thani I'm having some electrical issues that are new.

 

Hard rain, power to the house goes out. Check panel and the main safeTcut breaker is tripped off, try to reset and just keeps tripping off.

So one the panel I switched off all the individual breakers vertically and horizontally.

Reset main safetcut breaker and start resetting the indiviuall breakers, starting at the top vertically and working my way down. No issues

Start on the bottom horizontally and when I get to the breaker with the blue mark the mains trip out again. 

Set the breaker in blue off, reset mains and contiue on with out problem.

 

Because its happening during/after a hard rain I'm thinking outside plug in.

 

Next morning reset blue marked breaker, no problem. Turn off blue breaker and go around the house to see where it is.

It apparenely controls two plugs ins in my living room, one for the TV/entertainment center and a fan plugged into a lower wall socket. Not outside.

 

 

Now can someone explain why the breaker does not trip but the Safe T Cut seems to be overly sensitive to any electrical slights?

This is the second house that I've had issues with this

 

And of course any ideas to fix the problem?

 

 

Edited May 21, 2021 by kwonitoy

[NCC1701A]

14 minutes ago, kwonitoy said:

Now can someone explain why the breaker does not trip but the Safe T Cut seems to be overly sensitive to any electrical slights?

This is the second house that I've had issues with this

sounds like your Safe T Trip is working. 

15 minutes ago, kwonitoy said:

It apparenely controls two plugs ins in my living room, one for the TV/entertainment center and a fan plugged into a lower wall socket. Not outside.

did you try unplugging these items one by one and then resetting breaker?

us extreme caution to make sure the breaker is off while unplugging/plugging or touching. 

[sometimewoodworker]

31 minutes ago, kwonitoy said:

Now can someone explain why the breaker does not trip but the Safe T Cut seems to be overly sensitive to any electrical slights?

This is the second house that I've had issues with this

That is reasonably simply explained.

The breaker MCB will trip when there is a bad short circuit, possibly hundreds of amps for a very short time. It will also trip when it is overloaded, possibly from 20% to about 50% for a long time ranging from  minutes  to hours 

 

it can not trip when there is a slight difference between line and neutral load.

 

the RCCB/RCBO safe-T-cut will trip if the line and neutral are not passing exactly the same current.

 

so when it rains you slight faulty wiring is allowing a trickle of line/neutral current to short to earth..  MCB does nothing, the fault is too small, the wiring is not in danger. safe-T-cut does it’s job and trips, because that slight trickle of current will kill you if you are unlucky, it passes through your heart and the day of the week has a “Y” in it ☠️

 

 

Edited May 21, 2021 by sometimewoodworker

[bankruatsteve]

1 hour ago, kwonitoy said:

It apparenely controls two plugs ins in my living room, one for the TV/entertainment center and a fan plugged into a lower wall socket. Not outside.

 

Are you sure that is all?  The breaker marked blue is 32A.  Seems like it would be going to where something big is plugged in/connected.  The main reason for RCD nuisance trip is moisture created fault.

[kwonitoy]

1 hour ago, bankruatsteve said:

Are you sure that is all?  The breaker marked blue is 32A.  Seems like it would be going to where something big is plugged in/connected.  The main reason for RCD nuisance trip is moisture created fault.

That's all I could find, I thought the same thing, that's a big circuit for what it's doing. As with everything electrical in this country <deleted> all makes sense. My bedroom has 6 light switchs.

 

There is no sense anywhere, the wires on the cables mean nothing. The bottom 63A breaker has green wires for power in from the safe t cut and a green wire going to the ground bar.

[kwonitoy]

2 hours ago, NCC1701A said:

sounds like your Safe T Trip is working. 

did you try unplugging these items one by one and then resetting breaker?

us extreme caution to make sure the breaker is off while unplugging/plugging or touching. 

It's an intermitant problem, my favorite kind.

 

When I took the picture the marked breaker is working fine so doing a one by one check on the plugs will do nothing as everything is working

[kwonitoy]

2 hours ago, sometimewoodworker said:

That is reasonably simply explained.

The breaker MCB will trip when there is a bad short circuit, possibly hundreds of amps for a very short time. It will also trip when it is overloaded, possibly from 20% to about 50% for a long time ranging from  minutes  to hours 

 

it can not trip when there is a slight difference between line and neutral load.

 

the RCCB/RCBO safe-T-cut will trip if the line and neutral are not passing exactly the same current.

 

so when it rains you slight faulty wiring is allowing a trickle of line/neutral current to short to earth..  MCB does nothing, the fault is too small, the wiring is not in danger. safe-T-cut does it’s job and trips, because that slight trickle of current will kill you if you are unlucky, it passes through your heart and the day of the week has a “Y” in it ☠️

 

 

Thanks for a resonable explanation that I can understand.

[bankruatsteve]

5 minutes ago, kwonitoy said:

There is no sense anywhere, the wires on the cables mean nothing. The bottom 63A breaker has green wires for power in from the safe t cut and a green wire going to the ground bar.

Using conventional color is preferred, of course.  But, it's the size of the wire (matching the breaker) that counts.

[kwonitoy]

On 5/21/2021 at 7:44 AM, kwonitoy said:

Next morning reset blue marked breaker, no problem. Turn off blue breaker and go around the house to see where it is.

It apparenely controls two plugs ins in my living room, one for the TV/entertainment center and a fan plugged into a lower wall socket. Not outside.

 

So an update. 

 

The lower wall socket is by some patio doors, crawling around on the patio I find a circuit that's been patched into this socket and goes outside, through some bushes and to a water pump in a tank that I don't and have never used. Put in by a previous tenant I guess.

 

These wires are kind of put into a yellow plastic carrier pipe that is rotted and crumbling, the wires are the same condition, heavy rain, circuit is shorted and off goes the power. This wire has now been removed and I await the next rainstorm with anticipation