Light interfering with door entry.

[Simonslimline]

I live in a flat which has a buzzer to let people in. Recently I noticed than when i turned the buzzer to privacy later it would have turned back on gain by itself.

I changed my bathroom light a while back from a "4 pin 16watt 2D fitting" with a smaller style 2 pin 16watt fitting due to the old one stopping working.

I have noticed that when I switch the bathroom light off that the buzzers red privacy light switches off and the buzzer is back on again.


What might be causing this to happen! Any guidance on this would be much appreciated.

Thanks

 

[Simonslimline]

Could it either be something to do with the frequency, or possibly a collapsing magnetic field when the light is switched off?

 

[tazz]

Is the door entry system, one of the new touch screen types..?

 

[Simonslimline]

It's not touch screen. Looks like its wired in cat 5 or something older possibly. 4 x twisted pair.

Thanks

 

[tazz]

Can you tell us the make, so we can check out how it functions

 

[Simonslimline]

The information on the back is as follows ...

Videx Art. 940MS2L Intercom

Thanks

 

[tazz]

ok just checked the specifications......are you aware that the mute button is timed, so when pressed to mute buzzer, it will automatically switch back on after a preset time. Default setting is 15 minutes

 

[Simonslimline]

I have lived in the flat for 7 years and have never had any problems with the buzzer. Leaving it switched off for days on end and always stayed off, with the red light on.

I replaced the light in the bathroom a month back roughly and then this problem started happening. I only noticed it was the light doing it the other day. I made sure by resetting the off switch on the buzzer and switching the light again. Every time the light was switched off the buzzer red light turned off.

The light does have a ballast (not electronic).

Thanks

 

[tazz]

This is a goodie.....and i cant think of an answer, even a spike would only occur when turning the light on, not off.....so can only think of changing the handset

 

[Simonslimline]

Could the collapsing magnetic field in the ballast be causing this when the light is switched off?

To ad I have tried a normal incandescent wired to a pendant temporarily and no problem with the buzzer.

A new light might be the only option, however I am still interested why this is happening all the same.

Thanks for the input Tazz

 

[tazz]

Well you have narrowed it down to light fitting, which you hadn`t stated in you posts...lol.....Is the intercom powered off the same lighting circuit?

 

[Simonslimline]

Sorry I did mention it in my first post, probably could have been more clear though. The lights are fed from the cu in my flat, the intercom is fed from the landlord supply down below me.

 

[ian.settle1]

Sounds like you've got a ghost

 

[R G]

Sounds like you've got a ghost

Easily cured with an exorcism ,,

 

[kjgreen3]

Long shot maybe (no segregation between band I & band II ccts.) maybe the switch wire to the light fitting is running close to the intecom cable? (Doubt its CAT V, probably just 6 core/8 core bell wire with no shielding.)

Is the handset on the outside of the bathroom wall? Or close to the CU unit/CU unit probable cable runs?

Maybe leave the handset off the hook when you want privacy, it should technically do the same job.