Spark gap
You need about 25000 volts per inch for a spark in air, so so 230V - as is used for everything here in Australia, and for clothes dryers and such in the USA - can only jump maybe a quarter of a millimetre, on a good day.
So this, despite its appearance, probably did work, for suitably small values of “work”.
(It’s from This Old House’s Home Inspection Nightmares II; there is, of course, also a I. If that’s not enough for you, then I highly recommend the US Naval Safety Center’s Photo of the Week, which has extensive archives.)
Reminds me of the place I once visited, where a bloke thought a good way to attach electrical wire to the wall, was to simple nail it there. Straight through the cable...
Interesting day, that was...
Comment by Itsacon — December 8, 2006 @ 11:16 pm
I also highly recommend the "Wall of Shame" forum at HVAC-Talk, where HVAC professionals post pictures of the HVAC (and supporting plumbing and electrical) disasters they encounter from DIYers and other amateurs:
http://hvac-talk.com/vbb/forumdisplay.php?forumid=21
Comment by twoflower — December 8, 2006 @ 11:25 pm
The Navy site's the place to go for glamour - nothing beats 60 ton vehicles parked on top of each other - but that HVAC board definitely has its moments.
I particularly like this simple service job. It never occurred to me before that signs might need their own climate control.
Comment by Daniel Rutter — December 9, 2006 @ 12:11 am
Well that blew a few hours that I should have spent studying for finals. Poor timing...
Comment by Erik T — December 10, 2006 @ 8:13 am
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Comment by hannahvaldez — April 27, 2012 @ 1:00 pm