I am talking about this one.
The info clearly says
White - Common
Green - N/O
Brown - N/C
-
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Built-in Wardrobes with Automatic Lighting
- Thread starter dwarfer16
- Start date
I am talking about this one.
The info clearly says
White - Common
Green - N/O
Brown - N/C
It also only shows 2 cores in the cable
I suspect you get different colours depending on which version you buy.
I cannot locate relay I was thinking of. probably a good thing as it would have been a expensive method. But very good as the light would go out if the door was left open for more than a set time.
The reed switches http://uk.rs-online.com/web/p/reed-switches/2897799/ are normally open and close when the magnet is close enough
There are various ways to make a normally open switch operate as a normally closed.
Putting a piece of steel between the magnet and the reed will absorb the magnetic field ( a magnetic shunt ) and the reed will open. In this application the magnet and reed are fixed so the reed is closed and the shunt is attached to the door such that is between magnet and reed when the door is shut.
Instead of a magnetic shunt another magnet of the same type ( strength ) but in the opposite polarity ( North and South reversed ) will negate the effect of the first and let the reed open provided both magnets are the same distance from the reed,
The reed switches http://uk.rs-online.com/web/p/reed-switches/2897799/ are normally open and close when the magnet is close enough
There are various ways to make a normally open switch operate as a normally closed.
Putting a piece of steel between the magnet and the reed will absorb the magnetic field ( a magnetic shunt ) and the reed will open. In this application the magnet and reed are fixed so the reed is closed and the shunt is attached to the door such that is between magnet and reed when the door is shut.
Instead of a magnetic shunt another magnet of the same type ( strength ) but in the opposite polarity ( North and South reversed ) will negate the effect of the first and let the reed open provided both magnets are the same distance from the reed,
The best one of which, of course, is to buy a NC one.
Yes but normally closed reed switches that can switch 230 volts are not common and tend to be expensive if they have a good snap action when they open,
On the diagram, it does, and immediately below the bit you've quoted it also says:
... and if you scroll down to the Spec, it says that the contacts are NO.
Kind Regards, John
Ahh, obvious, isn't it!
Rather than complex arrangements of switches and relays, fit one of these in the cupboard ceiling:
http://www.arrowelectricals.co.uk/l...pir-light-sensor-for-cabinets-in-silver-p3200
http://www.arrowelectricals.co.uk/l...pir-light-sensor-for-cabinets-in-silver-p3200
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