On Nov 18, 7:26 am, "Arfa Daily" wrote:
"James Sweet" wrote in message

news:KbQ%i.5554$B21.4712@trndny07...





"**THE-RFI-EMI-GUY**" wrote in message
...
Don't try to short out the safety bulb, or you will have a fire. It is
there to act as a fuse.

As the "shunt" bulbs burn out, the voltage (and current) accross the
remaining bulbs increases thus accelerating failure of remaining "shunt"
bulbs. Eventually the "safety" bulb in the string blows out. The solution
is to replace "shunt" bulbs whenever they blow out. Delayed too long, the
"safety" bulb goes as well.

I would string a new set of lights on the worst branches this year and
replace the tree next year for safety's sake.

2500 lights, thats a lot of lights!

When did this "safety bulb" thing come about? This thread is the first
I've ever seen or heard of it. Is it a European thing or is this here in
the US? Every string of miniature series lights I've ever seen has all
identical shunted lamps and a fused plug.

I bought very long strings in Walmart a few years back, as house decoration
lights are VERY expensive here in the UK compared to in the US. As each
'set' is made up of two strings, originally paralleled by the end-of-string
connectors for use on US 110v line power, it was easy enough over here to
just remove the plugs at one end and series two strings for 230v line power.
You could then just plug two more 110v strings, one into each 'far-end'
connector, to have two 110v paralleled strings in series with another two,
across atotal supply of 230v for 2000 lights. Total cost about $16 as I
recall. Over here, that amount of lamps would have cost $200 or more,
equivalent.

Anyways, the point is that these are a three wire circuit, and each new
three wire sub-string, has a replaceable safety fuse lamp at its beginning,
so there are multiple safety bulbs per fully wired string. So no, it's not a
European-only thing, as these are US purchased lights. Every year, these
ones drive me up the wall as well. Every year, I think that I've got the
wiring arrangement 'fixed' in my head, then every year, it all seems to go
wrong. The fact that I have paralleled strings in series, *really* confuses
the issue, because if one section of one string goes out on one series'd
half, then the voltage no longer divides equally across each paralleled
string, so one half lights up like flashlamp bulbs, whilst the other half go
as dim as candles ...

Arfa- Hide quoted text -

- Show quoted text -

Arfa,

If you need more lights shipped over there, just send me an email
direct, tell me what you want, and I'd be happy to help you.

And thanks for your response to the post.