Advice on regulation 521.5.1

[Risteard]

Indeed, functional earthing is where most legitimate leakage current comes from. Not that it has anything much to do with eddy currents - they start being a problem with hundreds of amps, not a few mA.

Completely agree. Just pointing out that it isn't correct to state that there can be no current on the Earthing Conductor without a fault current.

 

[Dave OCD]

There mightn't be much, but I wouldn't say none (on appliances).

I was thinking along the lines of the installation rather than connected appliances.:smiley2:

 

[shanky887614]

Indeed, functional earthing is where most legitimate leakage current comes from. Not that it has anything much to do with eddy currents - they start being a problem with hundreds of amps, not a few mA.

thats my point, you wouldn't get 100amps flowing on the earth in a domestic property

in commercial/industrial yes it is something to consider because of the size of the supply etc.

now i will follow the reg but im just saying in my opinion its belt and braces with reguards to the earth

if people have safely put the earth in the board for the last 100+ years i doubt it is cause for concern

 

[Dave OCD]

Maybe momentarily under extreme fault conditions but unlikely.

 

[shanky887614]

Maybe momentarily under extreme fault conditions but unlikely.

a fault current that high would melt the copper where the fault is located and clear it before the eddy currents would start to work on the earth

i doubt 6ka fault current would be enough to instantly cause noticble affects on the install before it trips the breaker

 

[Dan]

Just bumping some threads in the Electrical Wiring Theories and Regulations forum category here on our Electricians Forums. If this specific topic isn't current, just ignore it, it'll drop off the list in no time. However, if it's something you'd like to contribute to, feel free to reply and bring it back into current discussion.

 

[HappyHippyDad]

You chose to bump this thread Dan!!!
Could get interesting if the same characters are still around