RCD tripping dilemma

[2BobSparky]

Appreciate those responses.

 

[i=p/u]

well id say the one rcd monitoring all mcbs sounds a culprit. how many computers are on these cirutits?? earth leakage tester i think may help you.

wouldnt say need todo IR test now if you have disconnected rcd and its working. too many computers , the air con units

 

[Moses]

FFS...... do an IR test.....:banghead:

Nice one!!!

Do an IR test on all circuits.

If that's good, then you have appliance leakage / faulty RCD.

 

[Plonker 3]

If you don't want to help, which is why I am here, then perhaps you should walk away right out of this thread.

- - - Updated - - -



I'm making enquiries so I can better understand the situation.

I understand you are hoping to understand the fault, but before you go any futher I would advise getting a spark in who has a good knowledge of these situations. You seem to have a very limited knowledge of this, I am sure any spark you call in will be more than helpfull should you explain the situation to them.

Not everyone knows everything, and every day is a school day but you need to realise that this Forum as good as it is, isn't the answer to every fault you will discover.

 

[Deleted member 9648]

This is not feasible with the client involved and also the temperature in their office! This is also why something like an IR test is not possible at this very moment as we ware talking about a dead test, which means switching their CU off, it's simply not going to happen during business hours in the West End of London.

So anyway, in the end the RCD MCB was taken off of RCD protection and has been left alone to see if it will inf act trip itself.

I dont get why you cant turn off to properly test....if the RCD's tripping it's going off anyway isnt it?

 

[Knobhead]

I dont get why you cant turn off to properly test....if the RCD's tripping it's going off anyway isnt it?

I wondered how long it would take for someone to ask! :hurray:

 

[2BobSparky]

I dont get why you cant turn off to properly test....if the RCD's tripping it's going off anyway isnt it?

The tenants were reinstating the RCD and the tripping was happening interminttently.

The tenants are high demand and need power to their computers at all times. Something like an insulation resistance test would need to be conducted out of hours, which = overtime payment for labour, which is usually undertaken by subcontractors. It's a pretty frustrating place to work actually.

Since the MCB has been removed from the RCD protected side I don't believe it has tripped.

 

[BMelectrics]

Sounds like it could be an 'accumulative' earth leakage. All equipment has an earth leakage, some more than others, and since EVERYTHING is protected by the one rcd this could be the problem. May be an idea to include a main switch and take some of the circuits off of the RCD, ie: lighting.

In saying that, also perform IR tests on all circuits to ensure that there is not an earth fault actually present.

Just some food for thought

 

[joe j]

This thread going round in circles. 2bob may be out of his depth but life's a challenge and I'm sure he's not going to do anything dangerous. Sounds to me as though the present use isn't what it was designed for, we all see 4g extension leads around offices in converted houses where the design/spec didn't look in their crystal ball.
Sorry it's no help,

 

[SPARTYKUS]

2bobsparky, whereabouts are you in the country?

 

[joe j]

2bobsparky, whereabouts are you in the country?

Now that's what this forum is about. Well done Spartykus

 

[SPARTYKUS]

Now that's what this forum is about. Well done Spartykus

Joe j

Don't follow your train of thought please explain further?

 

[dwardy]

if its a office you might not need all the circuits on an RCD. so can eliminate a few straight away. how is the lighting wired, also are there any outside lights.

 

[SPARTYKUS]

Joe j

Don't follow your train of thought please explain further?

Still waiting joe j.


Just to clarify OP, I was asking where you are based in case someone reading this thread could pop in and have a look for you. Not quite sure how that fits with joe j :rolleyes2:

 

[Tonkatoy27]

How many pc workstations are fed from the circuits protected by this RCD? If it's a 30mA RCD you can only run abot 10 workstations before it trips and thats without leakage from any other equipment. Have they recently added any PC's? There's only one real way to fix it and thats dead with insulation resistance tests at the CU with all the neutrals disconnected from each other.
If you're trying to fix it trial and error by removing bit's and pieces from the RCD then you be weeks instead of hours.

I hope the office is shut at weekends or you'll need a free night and a big torch!
Good luck