I bought a new on/off + dimmer switch last week. It controls a 3 x 60 w
chandelier. One bulb blew tonight and as usually happens tripped the
RCthingy. When I re-set the switch the on/off works, but the dimmer
Is this to be expected every time a bulb blows as it will work out quite
I would say it is the fault current going through the dimmers winders
(or electronics?) that have damaged the dimmer.
I damaged one last year by cutting through a lighting cable - there was
probably 300-500 amps going through the dimmer for the time the earth
and live were joined, until the circuit breaker tripped, just like when
a lamp goes, it will cause a live to neutral fault current, which can be
hundreds of amps for a short time.
No but it used to happen to me a lot. In fact I even bought some cheap
triacs in a box so I could replace them.
Obviously now I don't use lights, but I never did understand why the system
was so sensitive to momentary shorts.
From the Sofa of Brian Gaff Reply address is active
"Jim S" < snipped-for-privacy@jimXscott.co.uk> wrote in message
It's said a solid state device is there to protect the fuse supplying it.
In the fuse rather than MCB days, I've had a lighting circuit one blow
when a bulb fails. Producing a dimmer which would stand that sort of load
might be expensive.
*If love is blind, why is lingerie so popular?
Dave Plowman firstname.lastname@example.org London SW
On Wednesday, January 22, 2014 12:16:39 AM UTC, Jim S wrote:
Fit a new triac. It happens once every so many bulb blows, and yes, it is a
pain. Use halogen-in-candle lamps and it'll happen very frequently. There
are other ways to dim incandescent lamps, eg switching a capacitor in serie
s with the bulb, or using a transformer to reduce voltage. Those can be don
e at the wall switch, though the bits need extra space made for them.
On Wed, 22 Jan 2014 06:39:54 -0800 (PST), email@example.com wrote:
Although I probably could, I am not into faffing around 'fitting new
triacs'. I just regard myself as being unlucky that my dimmer was the one
that blew in those circumstances. Shit happens.
I replaced it with a non-switching dimmer that I bought by mistake and if
it goes then I will just go back to a conventional switch. Life's too
On Wednesday, January 22, 2014 5:32:33 PM UTC, Graham. wrote:
s a pain. Use halogen-in-candle lamps and it'll happen very frequently. The
re are other ways to dim incandescent lamps, eg switching a capacitor in se
ries with the bulb, or using a transformer to reduce voltage. Those can be
done at the wall switch, though the bits need extra space made for them.
I found that caused severe flicker. 120v lamps have much thicker filaments.
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