Buzzing Mcb

[Lilyrose08]

Just recently installed a lighting circuit on a wylex type b 6amp Mcb and recently noticed its been buzzing I have changed it and it still buzzes all connection are tight what could it be there's dimmers on the circuit and 5 watt led lamps any ideas

 

[grantr37]

have a look at this for an example:

http://www.artisticlicence.com/WebSiteMaster/App Notes/appnote009.pdf


And this...

PWM illumination control circuit with low visual noise for driving LED - Beyond Innovation Technology Co., Ltd.


and maybe this...


LightingDeveloper.com -

 

[Paul.M]

Grantr37 this may seem sad but I almost got turned on from your post (# 15).

That has to be one of the best answers I have ever seen on a forum.

 

[Knobhead]

To add to what Grant has writen:
Have a look for inductive resonance on Google. The magnetic element of a MCB can act as a resonant inductor at certain frequencies.

Gets a bit worrying when the bus-bars in a switchboard “sing” to you.

 

[grantr37]

Grantr37 this may seem sad but I almost got turned on from your post (# 15).

That has to be one of the best answers I have ever seen on a forum.

haha what's everybody else doing up at this inordinate hour in the morning......and there was me busy munching the biscuits out of the canteen biscuit tin.....:26:


There are others on here who post just like me, take E54 and Tony as examples....

 

[Knobhead]

Insomnia, I’m retired so have no real need to be up at stupid o’clock. Just can’t sleep.

 

[Engineer54]

haha what's everybody else doing up at this inordinate hour in the morning......and there was me busy munching the biscuits out of the canteen biscuit tin.....:26:


There are others on here who post just like me, take E54 and Tony as examples....

At the time this post was written, i was at my desk enjoying a cup of coffee, going over the mornings memo's, ....lol!!

Would have been around 7am here...

 

[grantr37]

what made you move there anyway?

 

[Lilyrose08]

So is it anything to worry about then ?

 

[James Sutton]

Ive had similar when i installed 12V 50W lamps with wire wound transmormers and dimmer switches. I changed the the wire wound transformer for a new type tamlite transformer and the buzzing stopped. Ive also had problems when installing banks of LEDs and 50W Halogen with inrush currents tripping type B MCBs.

 

[Marvo]

Probably not, it's not a hazard as such, at worst it might nuisance trip once in a while, at best it won't be an issue at all unless the buzz is loud enough to be an annoyance.

 

[Engineer54]

what made you move there anyway?

Are you talking to me??

 

[Paul.M]

There are others on here who post just like me, take E54 and Tony as examples....

Totally agree its just that I've got a job coming up for a shop and it has over 200 LED's to install, your post has given me a bit more to think about so I get the job done right first time. Good timing.