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Is there regulation that says connector blocks can not be used to join cables inside a DB?
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Discuss Strip connectors in DBs in the UK Electrical Forum area at ElectriciansForums.net
Can they take 2x 0.75mm flexes?
Can they take 2x 0.75mm flexes?
As i said E54 failure may not rear its ugly head until a dead S/C ...which is why most get away with it and why critical industries ban them ... its not about their use under normal circumstances its about their use under fault conditions ... ive seen many a crimp on solid fail in my sector of the industry with inductive inrush although yes agree domestic not the biggest worry but shouldn't be an excuse to use them what we lack is solid guidelines hence the confusion ... we need the BS7671 to address this issue as it has had major consequences even if rare.
Got to be honest, i've never seen a failure in any sector of the industry that i've worked in, none that could be put down to crimping solid cores as the problem. Been a long time since working in the industrial sector though, and maybe i could be persuaded that on some machinery, crimping on solid cores may be a source of potential future problems...
As far as typical building services type installations go, i can't see any problem in the use of solid core crimping, providing it's correctly performed with good quality crimps and crimping tools!!
What major consequences issues do you know about?? Pretty sure, if solid core crimp connections were causing concern within/across the industry, something positive would have been done about it by now. As for involving BS 7671 hell, that publication has trouble dealing with some of the basic issues, it'll not do too well with the do's and don'ts of crimping requirements, in fact they're best left well out of BS 7671!!
I'm possibly a stickler for correct procedures, as you have pointed out its not a big issue within our sector but using insulated crimps on solid core cable unless they are specifically designed to do so has been banned in many industries - more so those where sound clean connections are crucial and can risk lives if not done correctly... I've probably seen as many burnt out through crimps as i have standard connectors and both suffer a common problem of working loose if the cables in them are moved about... not an issue if correct crimps used.
Not a problem really most of the time it just turns a dirty brown/black colour and stinks of fish and is contained but where the likes of rail signalling, aviation, NASA some chemical industries etc these practices are completely banned for very good reason that they give a poor unreliable crimp and as i float between a few of these industries i often see it specified both crimp and crimper types to be used only (although Ive not had chance to work for NASA yet )
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