RCD slope test - any help on when an RCD is tripping too fast...

[JONOXNAM]

Hi All, I was called to an RCD tripping problem tonight and I have found the cause which was a intermittent problem on a lighting rig.

My issue is that during my testing I did a slope test of the 100mA RCD protecting the main board. It was tripping at 65mA, my question is what value is acceptable for a 100mA RCD to trip at?


I have the 2391 & 2330 L3 but cannot remember any min times.

Thanks, Jon.

 

[Guest123]

Above 50mA is acceptable, 0.5 x IdeltaN.

I would expect to see it go at around 65-75mA with no load connected.

 

[JONOXNAM]

Great thanks.

One final Q I do all 3 phases but was told that this is not required as any phase shows the devices is working any comment?

 

[tony mc]

I would aggree with that as all 3 phases go through the RCD with the neutral.

Make sure you test it on both sides of the sine wave and record the highest 1 X only.

The max trip times will depend on the RCD a BS only number will be 200ms and a BSEN 300 ms.

Have a look at this post
[h=3]3 Phase RCD testing[/h]