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this could explain why it’s trips if there is no use for maybe 3-4 days, so voltage drop with naturally cause the rcd to trip from say large loads on at the same time? And i’m guessing rcds and rcbos at the fuse board don’t trip when there is voltage drop as it isn’t ‘latching’

yes it is where i got it from and it’s that one. so this ‘latching’ rcd will trip sometimes if the supply is disturbed voltage drop?

Ok. No nothing that would cause dips or anything. By the way the rcd trips at 24ma on a ramp test. As you mentioned earlier about the magnetic rcd types that trip when power dips, how do i know if i have this type of rcd?

The 2 gang switch was secured to the backbox during this test and readings still came back good.

The switch face Will this damage them? They are intergrated luceco leds. I will only be able to test between L-N as they are double insulated. If possible can i just test these individually with my meter?

When i said everything disconnected that is the 3 down-lighters taken off the circuit yes. the extractor fan is not in yet, the 1.5mm 3 core and earth sticks out of the wall with all conductors separated in 4 wago connectors. my meter can read at 250V. The rcd fcu is a knightsbridge and has...

The 1.5mm twin and earth comes straight from the RCD fcu down to the 2 gang switch, one switch feeds an extractor fan and the other switch feeds 3 downlights. This makes it 3 cables at the switch, one that feeds it and the other 2 are loads going off. That’s all that is on the circuit it’s a...

disconnected cable going out from rcd, IR tested at 500V with everything disconnected N-E= >999Mohm L-N= >999Mohm L-E= >999Mohm so every reading is good but it’s still confusing as to why it’s tripping.

ah yes coming back on the earth through the neutral causing an imbalance. So if i megger N-E from the rcd this may find the fault?

so you’re saying high loads that can leak current before the rcd can cause the rcd to trip even though it’s before the rcd?

no it’s an RCD fused connection unit with a 5 amp fuse, that is fed from a ring final circuit.

what do you think terminals are loose or too tight?

it’s a lighting circuit, so it goes from the rcd fcu down the switch then feeds the 3 downlights with one switch and another switch feed extractor fan. nothing else on circuit, reasonable short too. Note that extractor fan has not been put in yet but downlights are.

Rcd fused spur feeding extension from ring final circuit. Goes to a 2 gang switch with 1 switch operating 3 downlights and another feeding extractor fan. Zs, R1+R2 and RCD tests completed and are good. Problem is that when you leave the lights off for a few days without touching them, when...

That’s what i’ll do then, 100mm cavity with full fill rockwool bats, sound ok?. Also when should i start to put these in? Above the dpc or on the dpc? One more thing about a cavity fill, where you fill the cavity with concrete? Does this need to be done, and at what level to? And do you put an...

ah. I’m pretty sure the wall i’m building against does have a dpc ( i’m not too sure though). I could put one in just in case but the mortar doesn’t stick to it very well does it i’ve heard. I can’t see if it does have a dpc as it is rendered. Also i’m going to cut a channel out of the render...

That makes sense. another thing i’m confused about is can i have my internal dpc, one or two bricks lower than my external course? Can i have full fill rockwool insulation in a 50mm cavity without and damp problems? And using a wall starter kit, does this require a dpc vertically? (i’m not...

sorry going back to this answer, turning the dpm up so the 50mm concrete slab doesn’t touch the brickwork at all, wouldn’t weeds grow up between the dpm upfield and brickwork as the concrete isn’t covering it all?

why are shower trays so prone to cracking? and why are ones with upstands better?

water could fill a cavity with dpc at the same level can’t it?