[SML] Wire junction

[taco at peak.org]

Back at college, the prof told a story from his college days, about some gorilla pulling a heavy feeder cable across the floor on some temp installation. Coming across some obstruction that snagged the cable, he just pulled harder, hard enough to separate the cable from the snagged connector. The 240v bare wires weren't touching each other, but as they travelled across the floor, they were arcing and sparking as they shorted across the concrete, which politely disintegrated, breaking the circuit before the breaker tripped. He said there was about 4 feet of permanent scarred pitted concrete arc trail, and one hell of a smell, when the breaker finally went. The gorilla never even noticed, until he reeled in the cable at its destination. 



From: "Richard Niederberg via Stagecraft" <stagecraft at theatrical.net> 
To: "Stagecraft Mailing List" <stagecraft at theatrical.net> 
Cc: "Richard Niederberg" <ladesigners at gmail.com> 
Sent: Saturday, January 18, 2020 11:01:07 AM 
Subject: Re: [SML] Wire junction 

WOW! I can hardly wait for the spectacular arcing that would put Magnesium-based pyrotechnics to shame. 
/s/ Richard 

On Sat, Jan 18, 2020 at 10:52 AM Jerry Durand via Stagecraft < [ mailto:stagecraft at theatrical.net | stagecraft at theatrical.net ] > wrote: 


This is a free range thermo-dynamic junction. The junction quality will 
vary inversely with with the need, the more you draw the looser the ties 
get so the less it gives you. Being free range the junction can release 
offensive odors away from neighbors while being free to join up with any 
neighbors of the appropriate polarity that are willing to enter into a 
union. 

Warning, wire unions are often pretty wild. When the sparks start 
flying, nearby conductors should be insulated from the fallout. 

On 1/18/20 10:43 AM, Richard Niederberg via Stagecraft wrote: 
> Shouldn't you put a shrink tubing sleeve over the whole joint? <g> By 
> what factor, if any, has the current carrying capacity been 
> diminished? What should we de-rate the joint to? Will the heat rise, 
> if any, be higher than the insulation is rated for? 
> /s/ Richard 
> 

-- 
Jerry Durand, Durand Interstellar, Inc. +1 408-356-3886 
[ http://www.durandinterstellar.com/ | www.DurandInterstellar.com ] & [ http://www.durandinterstellar.ru/ | www.Durandinterstellar.ru ] 


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-- 
/s/ Richard 
_________ 

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