Neat blade fuse idea

<raps on monitor>

Ken? Is that you?

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, The Older

LOL! is he *still* banging on?

--
Wicked Uncle Nigel - There are few things in life more sinister than a
public toilet with the lid closed.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
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Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

doc wrote

What electrodes?

No hang on I see where you are coming from now, it's the TV thing innit.

You are suggesting that as the plasma cloud forms the components combine
together to form a modest Cockcroft-Walton Voltage Multiplier circuit
just like you get in televisions?

Won't happen.

Better than you understand condensers probably but I am not very good on
the internal chemistry on modern ones it has to be said.

 

It wasn't me but I do feel eminently qualified to comment [1] if you
like.

If you have an MCB on the lighting circuit it is common for a filament
bulb to cause a nuisance trip. When the bulb blows, there's a large Arc
current carried by the bulb on the circuit momentarily that trips the
MCB.

There's a good write up here from sci.engr.lighting =>

http://groups.google.com/group/sci.engr.lighting/msg/5e03bf99a8306d5b

A Type C MCB due to the trip characteristics will reduce the incidence
of this happening, but not completely.

As long as your Consumer unit is wired to split lighting circuits
sufficiently then a bulb blowing shouldn't cause too much
inconvenience. If it's taking out all the lights in the house, then it
looks like they're all running through the same MCB, which isn't ideal.

Either split upstairs and downstairs through 2 mcb's, or (more easily)
replace the bulbs with energy savers.

Cheers,

Paul.

[1] I have C&G Electrical installations and HND in Electrical,
Electronic and Communications engineering [2]
[2] (Cor !)

 

I want one like you used to get in the Science Museum <evil grin>

Regards,

Simonm.

 

Most, yes. I'm not misinformed about this; there are thousands of houses
sitll wired in aluminium.

Don't believe me? Look it up, and look up the reason for it.

 

Nope. Go and look for yourself.
By the way, who mentioned HV cabling? I didn't - I specifically
mentioned house wiring, a whole different kettle of apes.

So, you admit that wirenuts are about the equivalent of shite soldered
joints? Refreshingly honest of you.

Bty, look up 'creep' with regards to electrical connectors and aluminium
wiring. It also happens with copper.

You really are a know-nothing wanker.

Happy living in your wooden house, are you? With all those dodgy
electrical connections?

I sure as shit wouldn't be. Quite frankly, I don't how you can sleep at
night without worrying about the unseen and unknown connections buried
in your walls, slowly developing high resistance joints and gradually
getting hotter.

Pleasant dreams...

 

It's only merkins do that.

http://news.bbc.co.uk/1/hi/special_report/1998/03/98/mylai/64344.stm

 

I would have thought it was fairly simple. You are effectively
replacing a high resistance coil (filament) with a low resistance
plasma. The voltage does not have to change for current to
increase. I would not have thought the inductance of the filament
would be high enough to be significant,

Ken Young

 

You mean filament bulbs do not have a rated life time in the US?
Filaments degrade, the vacuum is not perfect for a start, plus
you get mechanical creep and electrical migration of atoms away
from the centre.

Ken Young

 

I thought it was that aluminium is half as conductive but a third of the
weight. steel core for strength and aluminium for current carrying and
lightness.

copper not strong enough, neither is alu, for big runs of cable.

 

IRTA "craps on monitor"

 

wrote

Where does the plasma come from? How long does this take to happen?
what occurs before the plasma develops? Are conditions within the
envelope of the bulb the same in every instance?

Neither would I but what do modern solid state sensing devices sense is
it voltage or is it current? Are they sensing the slope of the change
and interpolating from that or are they working slightly behind time?

 

Austin Shackles emerged from their own little world to say

That's what I (mis)remember from college 16 years ago.

 

The filament gets hot enough to vaporise. Because the resistance
drops it does not stay hot and the tungsten condenses on the
glass. In my experience conventional light bulbs usually go when
switched on.

Ken Young

 

Read it and weep, Yanqui.

url:http://electrical-contractor.net/cg...hoto+Forum&number=4&DaysPrune=1000&LastLogin=

 

This one is priceless...

http://electrical-contractor.net/ubb/Forum4/HTML/000450.html

Regards,

Simonm.

 

"Unfortunately, this thing was for real. As Joe will vouch, it was in
use by a Darwin Award candidate to watch his portable TV while in the
pool!!"

****'s sake. You couldn't make this up.
--
Dave
GS850x2 XS650 SE6a
I demand nothing of you except that you amuse me.

Folding@Home Team UKRM
http://vspx27.stanford.edu/cgi-bin/main.py?qtype=teampage&teamnum=47957

 

This one is priceless...

How about this scaffolding

http://electrical-contractor.net/ubb/Forum4/HTML/000870.html

 

Priceless. Mind you, as one of the posters says there, if it wasn't for
HSE and similar, we'd still be doing shit like that.
It wasn't so long ago I walked off a job when asked to rewire some barn
lights by standing in a tractor bucket.

****'em.
--
Dave
GS850x2 XS650 SE6a
I demand nothing of you except that you amuse me.

Folding@Home Team UKRM
http://vspx27.stanford.edu/cgi-bin/main.py?qtype=teampage&teamnum=47957