buzzing fuse board

[Kiryu]

Hi all, does anyone know why my fuseboard makes a loud buzzing noise when my electric fire, kettle & spindryer are running at the same time? :

[THRIPSTER]

Wasp's nest behind it?

[miajanjua]

Kiryu wrote:

Hi all, does anyone know why my fuseboard makes a loud buzzing noise when my electric fire, kettle & spindryer are running at the same time? :

Its possible for a hum to be heard from the CU, but most
of the time it is inaudible.

This happens due to the magnetic effect created by the High
currents passing through the conductors interacting with
magnetic field of other conductors in the close vicinity
and the earths magnetic field to a small extent.

Further if these conductors are not physically
restrained and are touching other conductors/CU sides
then it is possible for a louder hum to be heard as the
cable vibrate when under high load.

__________________
Moses took his tablets

[JohnD]

Has it really got fuses in it? With bits of fusewire? Then it is likely to be very old. There may be something loose inside if you can actually hear it.

Is it brown?

[securespark]

That's a bit personal, John...

__________________
As George Michael once said, "..if you're gonna do it, do it right, right?"

[Steve]

sure its not the meter you can hear? these always hum / buzz / clank / whirr.

[ricicle]

[quote="miajanjua
Its possible for a hum to be heard from the CU, but most
of the time it is inaudible.

This happens due to the magnetic effect created by the High
currents passing through the conductors interacting with
magnetic field of other conductors in the close vicinity
and the earths magnetic field to a small extent.
.[/quote]

Its called magnetostriction and is usually only audible in transformers or large switchpanels.

I would advise having the CU checked to be on the safe side

[Taylortwocities]

Yes have it checked. Could be a loose connection...

TTC

[securespark]

Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm.

Sorry!

__________________
As George Michael once said, "..if you're gonna do it, do it right, right?"

[ricicle]

miajanjua wrote:

ricicle wrote: [quote="miajanjua Its possible for a hum to be heard from the CU, but most of the time it is inaudible. This happens due to the magnetic effect created by the High currents passing through the conductors interacting with magnetic field of other conductors in the close vicinity and the earths magnetic field to a small extent. . Its called magnetostriction and is usually only audible in transformers or large switchpanels. I would advise having the CU checked to be on the safe side

mag·ne·to·stric·tion
n.
Deformation of a ferromagnetic material subjected to a magnetic field.


There is no ferromagnetic material in all CU's that I have worked on and no transformers in them either!!!
It may be a loose wire, But then why the humming/buzzing Noise?
What's the loose wire to do with the noise? what is the effect causing the noise?[/quote]

Yeah went off on a bit of a tangent there.If there is some loose connection in there be it a wire or fuseholder/mcb then there could be some vibration in there as the circuits are reacting with each other

[nozspark]

How's about a bell transformer adjacent to the CU!!

[RMS]

wylex boards use to have a din rail in the board to mount door bell transformers at the end. Thats the only buzzing i've come across in a domestic consumer unit.

[joe-90]

Are you sure that the buzzing isn't coming from the meter itself. I've heard meters hum when there is a high drain. I'm not sure what's inside a meter but something turns that wheel round.

[TANNERS]

has your mrs hidden her special toys in it

[DESL]

I had this recently when I'd installed a new CU - heard a buzzing from cupboard - it was the new electronic meter