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I assume the fan is venting to an external area? If so then throw the filter away. Also an extraction fan will not work well if the displaced air in the room can not be replaced. You need an air entry vent at the bottom of your bathroom door to allow air changes to occur while the fan is...

Apologies for the delay, a few domestic tasks (assigned to be by my daughter by executive decision and possibly conspiracy) got in the way. Should have results tomorrow.

I used all of my C&G2391 knowledge and hope for a pass :mrgreen: 1. You have installed a new radial circuit consisting of 3x socket outlets. The end of the cable is inside the consumer unit, but not connected to anything. What are the tests you would do, in what order, and how are...

There is a much lower cost alternative but I can't remember the manufacturer. I will post info tomorrow.

Yes, they are incredibly flexible but as you say on the expensive side. They are readily available over here and I will post the distributor tomorrow. Having said that, there is a lower cost alternative but for the life of me I can't remember the manufacturer at the moment despite using them...

Oh it's your problem alright, you just have not felt the impact yet and what is legal or ethical about presenting yourself as an electrician when you are under qualified and under experienced? Or are you going to tell your clients that you went on a course that can be completed in one week...

The DC pump is a good idea. You can use the NC contacts of a "current sensing relay" to detect the drop out of AC power. So the pump would energise as soon as the AC failed. You may also want to add a charger to the NO contacts so that battery is automatically charged when the AC is on...

You will not be fully aware of what is involved in the C&G guilds 2391 until you have taken it and as for studying for it, you can only study for the exam component. Preparation for the practical component comes from real experience of inspection & test of which you have virtually none...

Yep, that's essentially what I have got. I only have a 12VAC transformer but I can still get the correct current with a fixed resister and a pot (to fine tune) in series. It's amazing how easily RCDs trip. Not unexpected of course but a bit like trying to keep a set of scales balanced while...

Ah yes, I see your point. Up to 29mA RCD output neutral to line input side.

That's what I'm looking at at the moment. I'm trying to see what effect N>E current (from N-E PD derived from a TN-S supply) has upon the trip threshold. I'm using two potentiometers but it is tricky setting up the N>E potential without confusing the results.

EDIT

The DC current from the PVs is not small.

I always wondered if phase and neutral came into close contact in an RCBO (as a possible reason why there are reports of them blowing up) They do indeed. They are both "squeezed" into the current transformer (toroid) The flexible phase conductor is covered in what looks like silicone...

That's what I initially thought until I found the sub-enclosure with the "RCD" board inside (posted additional pics a few minutes ago) It has an 8pin surface mount IC. Very hard to read it but will get a more powerful magnifying glass and have a look.

Or simply murdered one in cold electrons - all in the name of science of course 8) http://www.diynot.com/network/sparkticus/albums/9892

B----r :| I knew that the phase issue would have got me in the end. Should have gone with my original thought about it which I immediately dismissed/retracted. Theres no substitute for sketching things out is there! But I still think there is still an open issue with TN-S/TT in a no load...

I don't think so. I think they will balance. keep in mind that the N-E 5Volts (and the subsequent 5mA that you mention) is not from the phase. It is from the Neutral via the sub-transformer so it passes through the Neutral side of the toroid (to earth) just as the phase current (5mA that you...

Yes I think it is. But that is not what I was trying to describe. Admittedly I could have described it better but my thoughts on it were evolving at the same time. What I am saying is that on a TN-S or TT supply the small N-E current that could exist can slightly modify the trip threshold...