The les 24 volt ones usually did, these were big bulbs, not the weedy push
in crap we got later on. How having single insulated twisted wire live to
full mains in crap little plastic sockets was ever safe in the first place
eluded me.
My series ploy at least made them pretty fail safe until the cat tried to
pull them off the tree, that is.
Brian

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"The Natural Philosopher" wrote in message
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On 17/12/2019 20:20, Dave Liquorice wrote:
On Tue, 17 Dec 2019 07:46:39 -0000, Brian Gaff \(Sofa 2\) wrote:

If you will recall back in the days of filament bulbs all wired in
series across the mains,

Not a lot different now, have chains of LEDS across a supply of a few
tens of volts.

Of course the danger here was that if a bulb blew short circuit then
you could get a wonderful catastrophic failure ...

Tree light bulbs are designed to fail short circuit. I've never known
a set run away blowing bulbs or the fuse bulb. Failing short makes
finding the duff one fairly easy, it's the one that isn't lit. Fail
open and you have to test each bulb individually.

All the lights I had failed open


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