0.1meg

[sellers]

Went to an RCD tripping randomly today, kitchen was showing 0.1meg L+N to E. located it to a dishwasher. Would this be enough to trip the RCD? I imagine with it being so low anything else slightly adding to the leakage will make it trip?

Tom

 

[NozSpark]

Well,,,,

I=V/R

=230/1000

=0.23A. or 230mA

So yes, easily enough to trip a 30mA RCD

EDIT......

oops, 0.1M = 100000 ohms not 1000 ohms... doh

So as said by others below its only 2.3mA, and by itself shouldn't trip a RCD

 

[Lurch]

Amazing, those basic calculations you learn on day one of any training about anything electrical are useful, fancy that.

 

[ianmacd]

Erm isnt that 230/100000? so 0.0023A or 2.3mA?

I assume you tested on IR setting? 0.1Mohm may not be accurate on that scale so could be lower still.

 

[NozSpark]

Oh poo.. sorry

Trying to do this on my phone on hols is not a good thing..

He still can't remember ohms law though!

 

[ianmacd]

Oh poo.. sorry Trying to do this on my phone on hols is not a good thing..

He still can't remember ohms law though!

Indeed.

 

[spinlondon]

Perhaps he did remember ohms law, used the correct figures and determined that a 30mA RCD should not trip at 2.3mA.

 

[Andy™]

Went to an RCD tripping randomly today, kitchen was showing 0.1meg L+N to E. located it to a dishwasher. Would this be enough to trip the RCD? I imagine with it being so low anything else slightly adding to the leakage will make it trip?Tom

if your getting a reading that low, change setting to continuity. sometimes a bit more useful

 

[rugbymacc]

can you test the rcd.... and see if its over sensitive???

could be tripping at 15mA?

I only say this, as early this year I had a similar issue regarding RCD and a dishwasher.

tested the RCD on ramp test (15mA),

 

[Evans Electric]

Just making a point .... I seem to get more faulty RCDs than ever ,these days.

 

[Apache]

Just making a point .... I seem to get more faulty RCDs than ever ,these days.

That's because you are using more RCD's these days than ever before