Main 100A switch tripping

[Druncanduncan]

Visited a job today. Small shop. 'Lectrics are tripping out. Ok! Newly rewired due to the problem that still exists. New board 100A main switch. Not rcd. Board has 12 rcbos. Intermittent tripping. When it does trip it takes out main switch and ALL rcbos. Tncs system. Not widely experienced so have asked a number of people, nobody has heard of this happening. Any thoughts guys n gals? Appologies no photos as yet

 

[davesparks]

Change the lock on the door and see if it magically stops tripping!

And posting up some pictures on here would be good, but do expect a little light ribbing if it turns out to be an RCD and not a switch


Sent from my iPad using Tapatalk

 

[sparkdog]

Must be the trip fairy.

 

[sparksburnout]

Don't usually, but it's the customer I feel sorry for..............

 

[Pete999]

No murdoch not mA. The main switch on the board is rated 100A. This operates aswell as the rcbos. I agree i havnt given enough to go on. Will be going back so will get some snaps etc. Apparantly the rewire was down to the current problem. Obviously the problem was never solved.

Think Murdoch means is the Main Switch a 100A 100mA rcd, someone asked does this Main Switch have overload settings?

 

[Pete999]

Must be the trip fairy.

Or the fairy is on a trip, charity Shop mmmmm

 

[Pete999]

Not sure who did the rewire. Cannot get any info off them though as the client wont pay them due to the fact that the original problem still persists

What was the "original problem" the constant tripping?

 

[Adam W]

Its very strange, you would assume that a full re-wire would include replacing all protection devices and include a new main switch in the new CCU??
If the installation has been tested correctly and is satisfactory then one would assume that it is an appliance or accessory causing the problem??

You'd hope so, but then thorough testing should have revealed where the fault was. Unfortunately some people don't work like this though, instead resorting to going though the installation trying changing everything they can to see if that does it.

If everything is on RCBOs you'd expect a faulty appliance or accessory to only trip that circuit, and certainly not the 'main switch'.

Without having seen the installation I can't help thinking either some local scallywags are sneaking in and making a nuisance of them selves, or old Mrs Miggins who looks after the shop on a Wednesday afternoon feels more comfortable turning everything off before she locks up.

 

[Druncanduncan]

Well thanks all for the input thus far. Going back monday by the looks so hopefully be able to shed some more light on the subject

 

[Eco Chap]

Curveball - maybe someone had a 100amp double pole mcb in the totty bag (as we all do naturally) and wanted to replace the original rcd that came with the board.

Thinking outside the box and all that

Sent from my SM-G920F using Tapatalk

 

[David M]

Well thanks all for the input thus far. Going back monday by the looks so hopefully be able to shed some more light on the subject

Try to take some pictures if you can, so we can see the offending critter! arty: