RCD's inline

[SimpleSimon]

Sonebody correct me if Im wrong please.
Scenario: On a local gypsy site, the plot consists of an.outbuilding that contains shower,water heater utilitys bench and some lights. Also.supplied is a 32a comnando socket used to power the main caravan.
The main CU in the outhouse is controlled by a 30mA main switch RCD.
From the comnando.socket a 6mm armoured flex runs from the commando plug straight into the caravans owm CU. Inside the caravan CU it also has its own RCD main switch 30mA. Si two RCD's inline.
The problem is that somewhere there is a fault that will trip either the RCD in the caravan or the RCD in the outhouse,or both.
Now the RCD only trips randomly and not related to the usage of anything, Ive never seen in trip in the three/four times ive been there. Today it has tripped and they cant swutch it back on (this is all over phone today). Ive put it down to a leak as the weather round our way is awful and previous times its only tripped whenever its rained.
So when they both trip one can be swuitched on straight away but one wont come on for a few hours. It always swaps over either one or the other, ciould anyone tell me why it takes time to come back on?

So if its tripping both RCDs the problem must be coming from inside the caravan right? Im trying to tell the tennants this but they say they think its from the commando socket. Im trying to tell them that if it was the socket the RCD in the caravan wouldnt trip, I am right in saying this?
Also just been on the phone to the guy RCD in outhouse keeps tripping and stays off. So i tell him to unplug the caravan from the comnando socket and hey presto the RCD comes back on, proof that its not the socket right?!!
I just need you guys to tell me whether what ive said is right ir wrong as im gettung paranoid. If the problem was on the supply cable to the caravan, it wouldnt trip the inside RCD, only the first one right??
Thanks for reading this long long start.

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[mechelec]

good luck getting paid. However much you tell them your bill is I will be very suprised if you get paid it all or indead any at all !!!!

 

[SimpleSimon]

It diesnt matter about pay,its council work so its through my company, and to be fair theyve been nice as pie to me so far so no complaints, its just trying to explain to them that its in there caravan because once its past the service cable going in there its nothing to do with us.

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[SimpleSimon]

Unless theres a N-E fault

Ah so if its a N-E fault does this nlmean RCD could still trip even with MCBs switched off?

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[Marvo]

Yep, as soon as any current flows through the RCD it would trip with a N-E fault even if the live of the faulty circuit is isolated.

 

[GLENNSPARK]

It diesnt matter about pay,its council work so its through my company, and to be fair theyve been nice as pie to me so far so no complaints, its just trying to explain to them that its in there caravan because once its past the service cable going in there its nothing to do with us.

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well they might come across as all sweetness n light simon but dont you let your tools out of your sight mate......and i wouldn`t let on about whats in the van either.....sneaky light fingered little opportunist gets these are mate.....dont lose sight of who and what they are mate.....

 

[SPARTYKUS]

Marvo. Like your thing re knowledge. I remember from somewhere that data becomes information when the data has "meaning". Guess thats a further step back!

 

[GLENNSPARK]

Yep, as soon as any current flows through the RCD it would trip with a N-E fault even if the live of the faulty circuit is isolated.

yep.....and its often the case that when working on an RCD`d circuit where the neutral is still in the neutral bar (a bad practice) then if the neutral inadvertantly comes into contact with the CPC.....so then the RCD lets go.....

 

[brooky25]

If these are touring vans and not static, its probably a heater or something that they have plugged in because most of there trailers are renewed every few years and theres little that run of 230v in them anyway apart from 12v transformer and fridge. I know a few travellers round my way that are sound but still gotta have your wits about you.
To be sure, to be sure

 

[mogga]

GUYS PLEASE TAKE NOTE A Lady was recently prosecuted for having made derogitory remarks about the traveling community on her facebook and as this is a PUBLIC OPEN Forum Id prefer that this forum stayts as it is ie Self goverened Im not a MOD but just saying what Ive seen in the papers

 

[SimpleSimon]

No its a static and all 230v.
It dont put me a step back really because its still inside the caravan which is what im trying to prove. Im not really bothered what it is because Im not allowed inside the actual caravan. Anything outside the caravan is my problem.
Im thinking there's a leak somewhere because it gets worse in the rain. But you try telling him that.
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[brooky25]

Well I would do your tests on the shower block side and maybe do a quick Ir test on the hook up lead as a favour and show him its a fault in the trailer. Not much else you can do if your not allowed in the trailer

 

[SimpleSimon]

Exactly. Cheers lads.

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[Knobhead]

GUYS PLEASE TAKE NOTE A Lady was recently prosecuted for having made derogitory remarks about the traveling community on her facebook and as this is a PUBLIC OPEN Forum Id prefer that this forum stayts as it is ie Self goverened Im not a MOD but just saying what Ive seen in the papers

I’ll try and remember that next time I find one going though my tool cupboard!

Nothing was safe on site when the ******** came on there annual visit.
I’ve even had them trying to sell back stuff they’d nicked off the site.

 

[Guest111]

just a point of advice,you say you have told them to turn of mcb,s etc and they say they have and it makes no difference, but have they? I,ve had many dealings with these people over the years and they very often do nothing and then say they have,one classic I had was this, installed cctv for one as he didn,t want his stuff pinched anyway kept ringing me up saying ptz was locking out so everytime I went down it was the settings that had changed,and he swore he hadn,t touched them anyway in the end one of his kids was wathching me and said "what do these buttons do cause whenever dad presses them the camera packs up" He was messing about and in the end I just refused to go out to him.they tell you one thing and do the opposite

 

[Stevesplatto]

Shouldnt there be discrimination when RCDs are inline?
Just install a time delayed RCD upstream..

Agree with Mogga wrong site to get into any other discrimination cept the one above ;-)