On Sunday, October 09, 2011 11:03:17 AM andy pugh did opine: > On 9 October 2011 01:44, gene heskett <[email protected]> wrote: > >> http://www.tlc-direct.co.uk/Images/Products/size_3/AAJB5.JPG > > > > Yikes! Perhaps marginally useful with stranded wire, but cold flow > > after 6 mo to a year would have me laying awake nights unless your > > locale has flat outlawed alu wire. Even with copper, I would want to > > re-tighten them at 3 to 5 year intervals because cold flow will > > eventually reduce the pressure > > Aluminium wire is not allowed, no. Not for a very long time, and I > have never seen any. (lead-sheathed, cotton-insulated yes, but no > aluminium) > Junction boxes must always be accessible to allow for re-tightening. > Whether anyone ever does is a different question. > > Are you saying that Wire Nuts stay tight indefinitely? And that they > have enough contact pressure to maintain gas tightness? > Yes Andy, if properly installed on the wire(s) they are sized for.
> How do you make the connections to lamp holders, plug sockets and > switches? Are those not screw-clamp? We have both screw, and strip it and stick it in the hole where a 1 way spring lives duplexes in use today, and lamp holders generally have screw- clamps made of springy material, usually with a ridge stamped in the middle so a stripped wire can be held by this ridge. The screws usually have a bit of a skirt so it makes a high pressure connection even if the screwdrivers batteries are flat. But I'm a little retro on that and will form the 270 degree loop in the wire if I can get to it. And of course a clean sharp screwdriver is used to tighten it to about 1/8th turn from broke. I am not a huge fan of how we do it here Andy, the hardware keeps getting more sloppily built, with emphasis on a speedy install as opposed to do it right & forget it for 75 years. The connection tech itself is usually good, but too dependent on properly doing it. Assembly parts fit _most_ of the time, but are so sloppily built that the average electrician will try to put the screw in, fail, and will toss it and get another as his time is worth more than the sloppily made part. I have actually seen the common 6-32 screw used for holding a duplex into its box in the wall, that on close inspection after it broke, was obviously made out of alloy injected into a split mold rather than cut or rolled threads. Like I said, they walk among us... Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) All newspaper editorial writers ever do is come down from the hills after the battle is over and shoot the wounded. ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
