I find if you make a crimp with a decent ratchet crimping tool then even with solid core cable you still get a very solid joint. You will not easily pull the wire appart.
Seems like one of the less likely things to cause a fire. I assume that you would have tested the circuit (i.e. low ohms continuity, 500V insulation resistance etc) before use anyway.
Bit of a non issue I would suggest. You would need a pretty poor earth loop impedance (i.e. 500 ohms or worse) for that to become an issue with a 100mA RCD....
To reduce the risk of getting a live / earth short occuring in the supply side of the CU (where the fault current generated would be limited and insufficent to blow the main fuse). See the On Site Guide (brown book) page 20.
[snip]
So if I install some specific sockets (or socket) for outdoor use (including a built in 30mA RCD) can I avoid having to install a 30mA RCD within the CU?
I ask because I have a rented house where there is a small 6 way CU with all circuits protected by a 100mA RCD. Clearly, this avoids the problems with lights tripping the 30mA RCD when they blow, and could be argued to be safer than no RCD at all but it does not provide a
30mA RCD protection for outdoor supply.I could fit a 30mA RCBO I guess except that the downstairs has two circuits for sockets so that could get expensive. Installing one of the double sockets with built in 30mA RCD into the garage or just inside the back door and being designated for external equipment use would solve the problem.
If it is allowed of course. If not, what other suggestions?
Rob
Replace 'spam' with 'org' to reply
That sounds a good idea if you know that the RCD protected sockets are the closest ones to an exit. But beware of someone using an extension through an open window.
So the exisitng setup is old metalclad CU with troublesome buitl in mains incomer RCD which nuisance trips occasionally,no apparent fault,perhaps 3 times a year.
Old rewireable fuses have been replaced in the past with plug in MCBs
2x6A for lights,1x6A for central heating system, 1x16A for immersion heater, 1x30A for ring main,1x30A for cooker (gas cooker now fitted!).What would be the best configuration for a split load CU?. Shuodl i just ditch the RCD and wire them all up through the isolator?
J
That's interesting. I have also rather a dislike for these things, even although they seem to be available everywhere. I have a decent cantilever crimp tool, but find that if you use flex at the smaller end of the range with red ones, the connection ain't that good. This is mainly with car
1/4" spade connectors. I therefore no longer use them, and bought a very expensive crimp tool for the correct sort of connectors you get on maker's car looms. They also look rather better...If I've needed to extend a wire within a CU when replacing one, I've used a single choc block large enough to allow the wires to overlap, so they are gripped by both terminals. If I were moving a CU so some didn't reached, I'd be inclined to bite the bullet and rewire as necessary, or use conventional junction boxes at a convenient place for those which it was too awkward to replace. The cost of the materials are, after all, pennies.
That's what we did. Although it's good to also have one near any exit doors, top of stairs etc.
I would argue for mandating battery backed lighting like smoke alarms,in strategic locations, except that most people probably wouldn't bother maintaining them. Which would somewhat defeat the point. ;)
Lee
Its not uncommon for TT earth rods to be above 500r in summer.
Found it, when did that creep in, most TT CUs I have seen are are cast iron!.
On Wed, 1 Dec 2004 12:09:58 -0000, "Christian McArdle" strung together this:
Just noticed this post. Sorry Christian, it doesn't. All you need to do is ensure that the tails can't come into contact with any metal enclosures they pass through before the first RCD on the system. I've achieved this before by running the tails inside PVC trunking within the metal enclosure that has been butted up to the terminals and passed through the side of the enclosure. More commonly, a PVC enclosure is used as it is easier.
Well get them back to put it right before your house burns down, Any smart arse reply will be quoted at your funeral ;) Bob
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