Indicator light when current is drawn...

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Situation is a block of units with shared external laundries. Each unit
has a switch internally that energises a power point in the external
laundry.

Is it (easilyishly) possible to install a lamp (something that clips
into a standard switchplate would be nice) that illuminates only when
current is being drawn through that circuit?

The object being not only a reminder that the circuit is live (via
lamp 'A') but also a convenient tell-tale as to when a run of
washing is complete (ie: when the machine stops drawing current).

(Of course, I'm stuffed if it turns out that the machines draw
current all the time - I will check that!)

 TIA,


GB
--
 "Most police misconduct occurs when citizens challenge an individual
  officer's authority" (Reiss, 1971 c.in Jermier & Berkes 1979)

Re: Indicator light when current is drawn...


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Perhaps you could adapt a current sensing circuit for automatically
turning on periperals when a computer is switched on. There was one
published in Elektor, July/August 2004 and I've got a feeling I saw a
similar thing in one of the other mags- Silicon Chip or EPE maybe.

I also found one at:

http://sound.westhost.com/project79.htm

Andy Wood
snipped-for-privacy@trap.ozemail.com.au

Re: Indicator light when current is drawn...


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<snip>

*************  First of all it's dangerous to modify any mains high voltage
circuits unless you are a qualifed electrician ****
(ie know what you are doing)

I been in that  UNIT situation.

I replace the switch with switch+light  (light goes on when switch is on)
but doesn't monitor current


You could look at current clamp meter
http://en.wikipedia.org/wiki/Clamp_meter

This needs to go around one of the wires

Or

http://en.wikipedia.org/wiki/Current_transformer



Joe




Re: Indicator light when current is drawn...


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I think you will find that poster means an indication inside their unit
so that they dont have to  travel umpteen floors to find out

Re: Indicator light when current is drawn...


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shared external laundries. Each unit
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Current transformers are often used in typical domestic PC UPS
devices,   Those that I have seen usually have about 4 turns of wire
round the primary, in series with the load (on one side of the mains
output).  The secondary is rectified, and monitored by the UPS to
determine the mains load, so as to act as overload protection, etc.

With a laundry, it probably be wise to use thick wire, due to startup
currents of washing machine motors, and possibility of a washing
machine/dryer being on at the same time, maybe drawing in excess of
20a continuous.
This is a lot more than a typical UPS that might be rated at anything
from 200-1000W

if you are technically minded and know what you are doing in relation
to mains wiring and safety, you could try removing the low voltage
secondary of a typical small transformer from a 240v (ironcore
transformer based ! ) plugpack and replacing the secondary (low
voltage side) with a few turns of 20a rated wire in series with the
load. Im sure you would get a usable voltage from the other side of
the transformer that you could monitor to get an idea of the current
being drawn in the laundry.

Depending on the voltage coming out under load, it could be used to
drive a LED through a suitable dropping resistor.
if the voltage is too much you can have less windings on the primary
(mains) side.


On the other hand you could try Haymans, Turks etc, they might have
something in their catalog that would do this job with much less fuss.


Remember too that since this involves direct connection to fixed
wiring doing this would certainly be illegal, if you arent a licensed
electrician, and even if you were, the device might require approval
etc.





Re: Indicator light when current is drawn...



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SNIP
and SNIP was what I meant to do just now, rather than quoting and so doing
exactly what I was whinging about!  The laugh's on me!



Re: Indicator light when current is drawn...


"Suzy the anonymous brain dead bitch "



** YOU  are a   TROLLING   BLOODY IDIOT

  And a PITA,  moronic net cop.

  PISSSS   OFFFFF




.......  Phil








Re: Indicator light when current is drawn...




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...

You can buy such things ( example -
http://www.oneclickpower.co.uk/index.htm ) but I have not seen an
Aussie version.


Andy Wood
snipped-for-privacy@trap.ozemail.com.au

Re: Indicator light when current is drawn...


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but I have not seen an
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Check your local Bunnings store, they have all manner of "smart" mains
devices like that, so may have something that is suitable.

Dave.

Re: Indicator light when current is drawn...


Suzy"


** YOU  are a   TROLLING   BLOODY IDIOT

  And a PITA,  moronic net cop.

  PISSSS   OFFFFF




.......  Phil








Re: Indicator light when current is drawn...



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   If it works so well, buy one to remind yourself to take ALL your
medication.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
We've slightly trimmed the long signature. Click to see the full one.
Re: Indicator light when current is drawn...



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OUCH!!!!
Slam dunked beautifully. :-)




Re: Indicator light when current is drawn...


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   What can I say?  My health is finally improving, and my sense of
humor is backkkk! :)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
We've slightly trimmed the long signature. Click to see the full one.

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