Thanks guys...
I think the values are selected to reduce the current flow (as westward10 and others have suggested) rather than having anything to do with the actually heart beat/frequency.
I'd be interested to hear a medical explanation though....
Is there any particular reason why the trip times for RCDs at I and 5I are the values they are (300ms and 40ms).
Is there some particular medical reason why??
I'm just curious, no particular reason but may weave that into the conversation next time I'm in the pub!!
My fault....there are two existing CCUs. He wants them combining to make room for other stuff in his garage - I think it's a 'man-cave' he's creating, although thought it best not to ask....
Hi
I've agreed to do a job for a mate. He needs a consumer unit moving from one side of a garage side door to the other (door connects to the house). At the same time, he wants to combine a second CCU with the wiring from the first one.
Modern-ish house and no load issues so combining the two...
These look ideal for addressing cowboy lighting wiring. Ever come across a mass of cables hidden under insulation in a loft? Last surveillance visit I had I asked the inspector about such situations but he said you shouldn't be correcting other electricians wiring... That said, replacing a host...
Ever since I had an issue with buzzing and flickering I now only fit Varilight V Pro dimmers for LED downlights. Not had any problems since but the clients often have issues with the cost (£45+).
I rewired it all as a single ring but ran a new ring for the dining room sockets and the odd single socket...
Also ran a new radial for the oven..
It's a full house refurb and the floorboards are all loose at the mo. Tests out just fine now. Got until July to complete...
No idea myself. I'd have thought connecting rings in parallel would effectively reduce the resistance and therefore potentially increase the current through the cable. That said, it's my day off so that might be boll%$£"ks...
I've been working in a Victorian semi. I was asked by the client to take a look at the wiring for the kitchen ring final - in particular the state of the wiring under the floor boards.
What I found was a mass of cables connected into two 30A screw-terminal junction boxes. On closer examination...
That would mean breaking into the meter and I don't fancy that (being a self-confessed wuss). There would still be a hole in the top of it where the wire came out....
I thought of that but he'd know who it was and I could do without that aggravation.
Besides, it wasn't his fault as he hadn't lived with his dad for some years....
Here’s one for you:
A friend of a friend asked me to assess the wiring in his recently deceased father’s house – a small bungalow in fact.
Now the Dad (‘Frank’) was a bit of a botcher so I was expecting the worst.
Consumer unit – perfect with the wiring all neatly fitted etc. Wiring for the...
HD Sportster 883 Custom. Stage 1. My wife refused to sit on the pillion until I got a more comfortable seat - so, I fitted a 'Sundowner' retro seat - stopped that annoying whining noise straightaway!
Notwithstanding all the valid arguments regarding being contacted first about remedial actions etc etc, surely if you replaced a CCU and have therefore tested all the circuits therein, would you not then be liable for the integrity of those circuits? Unless of course you made specific reference...
Photo says it all. I'm sure I'm not alone in saying I come across this sort of 'installation' week in week out. Worst one I ever came across was a shower cable that went from 6mm to 2.5mm then back to 6mm - all wired into 'choc bloc'... and buried in the ceiling void.
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