has anyone seen eddy current in action?

[einstein]

Any good storys?

 

[sweet212]

A few years ago as an apprentice the firm I was working for replaced a switch panel feeding a leisure centre. The on site transformer fed a 3P ACB that then fed the panel. I cant remeber the amperages but I remeber the tails were 500mm in parallel. The cables ran along ladder racking before diving into the switch panel. The cables were dropped through the ladder racking in such a way that when initially energised within minutes the racking was red hot.

I remeber one of the lads walking in with a reciprocating saw saying he would fix it.

Great job working nights with good blokes. Those were the biggest cables Ive worked with.

James

 

[jamie-spark]

Found this the other day

Phone up by the concerned customer as the trunking lid was vibrating

 

[Marvo]

I think in general domestic and light commercial installations you're unlikely to see any spectacular effects due to eddy currents. Even in a case of severe disregard like in the photo above, where every final circuit has its live and neutral conductors through different entry hole, whilst the DB cover may buzz you're unlikely to cause sufficient heat to do any damage.

 

[ian.settle1]

Here is some

 

[Pete999]

Saw Eddie Kidd once, yes on a bus bar riser very scary

 

[Amp David]

John ward on you tube does a nice experiment to see how much of and issue edmund is on a small supply

 

[Rpa07]

@ian.settle1 , That YouTube clip took me on a right ‘rabbit down the hole’ trip - YouTube is fascinating and so time wasting!

 

[pirate]

but then, I'm not an electrician.

Do quite like JW though...

 

[pirate]

Of course, if you have multiple cables, as long as you don't put them through a single hole...just don't put them through any hole at all...and everything will be fine...so my wife tells me...

 

[Marvo]

John ward on you tube does a nice experiment to see how much of and issue edmund is on a small supply

I watched the video and a 110Amp current through a 25mm conductor gave a temperature rise of 2 degrees celsius above ambient. I guess over several years this might add a few quid to the electricity bill but it's not going to be any kind of significant fire hazard or safety issue.