Hey that reminds me of a J.B. I took out of a celing in a mobile home. They uncovered it for me because he knew it was there.It was burnt looking outside of box. I soon discovered they had joined a peice of copper wire to aluminum. I politely told him he was lucky to be able to call me. if a fire had started in the middle of night. He was saved because he didn't forget the cover on the J.B.
[This message has been edited by poppa Bill (edited 07-22-2002).]
Re: How not to wire a junction box#133348 07/23/0204:47 PM07/23/0204:47 PM
Paul, Just a short note on aluminium wiring, I was recently talking to a sparkie who done his time in the UK during the 1960's and he reckoned that someone over there must have had an aluminium fetish, as he was saying that all of the cables, conduit and a few other things were all manufactured from good old Al,is some of this wiring still found in older installations?,the aluminium conduit must have been a shocker to work with, ever tried to straighten a bent length of aluminium?.
Re: How not to wire a junction box#133350 10/12/0209:56 PM10/12/0209:56 PM
Termination characteristics of aluminium conductors have been improved with "8000-series" alloy compounded with a small amount of iron. The alloy is almost universal for inside [building] wiring left of the pond, but not used much in utility [site] applications. Part of the reason for that is that utilities typically use 100% hydraulic-compressed terminations and splices, which are as close to bulletproof as can be had. OTOH, for inside wiring in the US, setscrew-type terminations are unfortunately still quite common, and are truly P-O-S items, regardless of the insistence of many connector salesmen. Sadly, after 50 years, the politics of building codes still do not prohibit them.
As for raceway, I used to work in a winery that used 110% threaded-rigid aluminum conduit. Its coefficient of expansion is so great that straight runs firmly secured on pipe racks would "snake" quite noticeably [or tear itself apart] during temperature extremes.
Re: How not to wire a junction box#133351 10/13/0204:44 AM10/13/0204:44 AM
Here we don't use j-boxes in new, residential installations, when the wires are built IN the walls. Whenever we do use them (industrial instal, garages, cellars), then they have 2 b accessible. We wire from one switch to the other with L,N & PE. Our J-boxes are much more user friendly. I find the whole british system very unatractive for electricians to work with. Here we have much better material and more user-friendly.
Re: How not to wire a junction box#133352 10/13/0211:45 AM10/13/0211:45 AM
Belgian, I agree that some of the ways we have over here in England leave a lot to be desired, but it could be worse, they could start regulation on who can install electrical equipement ( I wish ) some of our practices might appear to be a bit odd, but as an electrician of a few years i dont see them as ( until i joined ECN that is ) Pauluk mate, are you originally from Blighty or are you still here, and why ?