In my hallway I have 3 LV halogen downlighters. The middle one went
so I replaced the bulb only to find that it still didn't work! I
presume that the transformer has gone and I also presume that each
light must have their own transformer as only one has gone. How easy
it to replace a transformer? I haven't tried to get the light
fitting out yet but I hope that they will have put enough length on
the wire to allow me to pull it all through the hole and replace it -
am I being too hopeful or am I going to have to go through the boards
The house is only 1 year old - I would have expected a transformer to
last longer. Is this a common problem or is it just the fact that
the builder has used crap transformers? Is there a difference in
quality - which type would you recommend?
So many questions!!
You first need to determine whether the lamps *do* have individual
transformers - or whether they are all fed by a single transformer. If the
latter, one lamp could fail to light if there were a wiring fault between
the transformer and lamp.
You'll need to get the fitting out to find out. Most such fittings are held
in by a couple of spring clips which spread out above the ceiling. If you
first remove the bulb (probably held in by a circlip) you should be able to
pull down on the rim and remove the fitting. It should then be pretty
obvious as to whether or not it contains a transformer.
I would be surpsied to have separate transormers in this case. What
Some setups have a fuse panal to fuse each lamp separatly. Some
transformers have separate outlets.
If the house is under a year old I would expect the transformer to
still be under warranty.
On Mon, 1 Dec 2003 12:10:32 -0000, "Roger Mills"
They are 50W lamps. A second one has gone, this time in the
kitchen - both within 3 days of each other so I am expecting more to
go and I have 13 of them altogether throughout the house. I have
taken both the lamps out and they have individual transofrmers so
that should make it an easy job....................looks like I had
better make a bulk purchase, screwfix looks the best buy.
Transformers if overheated often cut off on their own, and need to cool
down. I have a rougue one whoch works for 5 minutes and then is dead
unless switched off for at least 4 hours.
Replaeing it tomorrow with luck..
Anyway, you may simply have a duff transformer, not a blown bulb at all.
I tend to use toroidals - I got mine today from Newwy And Eyre, and the
nice thing about toroidals is that they don't wear out or blow up.
They just switch off if too hot - and they don't cause radio interference.
There are various ways that it could have been done..
There could be one tranformer per lamp or one single tranformer for all
three. It is also possible that transformer have not been used, it
could be an electronic unit instead.
A common problem with the low voltage lights is connections burnt out.
Sometimes the actual lamp sockets burn sometimes connections along the
wiring. They do carry quite a high current.
"Burnt out" as in fire hazard? I've just bought some of these but
haven't installed them yet and I'm a bit unsure now - especially as my
parents-in-law's house burnt down recently because of an electrical
fault (not LV lights.) Surely they can't be that dangerous, they seem
very popular these days and there must be millions in use.
Remove gloves to type a reply.
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Both my track uints went weird after bulb failures. Turned out that teh
clip together contacts between the transformer and rails was dodgy. I
had to dismantle, sand off the chrome oxides, and reassemble...
They did in fact 'burn out' but not in teh way you mean...
The lower the voltage, the higher the current has to proportionally be
for the same wattage of lamp. High current flow means connections have
to be good or they will heat up.
I actually meant burnt out in the sense of interconnections becoming
burnt out. A common failing of the 12v systems is the lamp holders
burning out, or the pins of the lamp itself. The heat generated
carbonises the insulation and or the metal, producing arcing. In such a
situation it is certainly possible that a fire could be started.
The thing to watch out for is to make sure the connections are good and
to keep an eye on low voltage lights for the flickering, which would
indicate a developing problem.
Having said that, I have a number of low voltage lights installed
around the house ;-)
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