N-E joined at the incomer of your house

[Kev2632]

I was just wondering with the N-E being joined at the incomer, if i was to go downstream of a circuit which was "NOT" Rcd protected and tested between Neutral and Earth that would appear as a dead short between N-E is that correct? but if i was to go downstream of a RCD protected it wont be there is at that correct? as it cant get passed the RCD is that right?

Thanks.

 

[Kev2632]

The RCD is only looking at the consumer side. If it looked at the supply side NO RCD would work as at some point all systems have the neutral connected to earth.

Thanks,

so in a consumer unit with NO RCD present, the Neutral to earth fault is present in all the circuits down stream is that correct?

 

[Guest55]

is this a wind up ?

 

[Knobhead]

Thanks,

so in a consumer unit with NO RCD present, the Neutral to earth fault is present in all the circuits down stream is that correct?

Correct, BUT it isn't a fault, it's a safety feature.

 

[Kev2632]

is this a wind up ?

no.... just wondering about this "

so in a consumer unit with NO RCD present, the Neutral to earth fault is present in all the circuits down stream is that correct?"

??​

 

[snowhead]

So in others words the Neutral to earth being "JOINED" at the incomer cant get passed the RCD as the Rcd only monitors what is down stream

N and E once joined never separate

 

[Kev2632]

Correct, BUT it isn't a fault, it's a safety feature.

yea? and that is because why Tony?


Thanks

 

[morph]

when the electricity goes back down the neutral it goes to the transformer where the neautral is earthed on a TNS system
on TNCS the earth and neutral are combined right up to the cutout as well

 

[snowhead]

I like threads like this! :clap:

Would this be a constructive comment??

 

[Kev2632]

Correct, BUT it isn't a fault, it's a safety feature.

What is the reasoning then for that?

 

[boberty]

I'M sorry but this thread reads like a child asking an adult WHY? WHY? WHY?

 

[snowhead]

when the electricity goes back and forth along (down) the neutral it goes to the transformer where the neutral is earthed on a TNS system
on TNCS the earth and neutral are combined right up to the cutout as well

Corrected

 

[Des 56]

Just imagine that the rcd doesn't have eyes in the back of its head
As long as it sees equalish current up the live and back through the neutral,it knows no different

It should see that equalibrium, because there is no circuit to return current through the earth wires, because there is no neutral connecting to those earth wires
Unless of course, a system or appliance fault allows that to happen,then it sees the unequal live-neutral through its coil and out she goes

 

[Rockingit]

If it helps, think of the Earth (or CPC or bonding or whatever variation we're talking about) as an emergency Neutral. If the current has to make the circuit by using it rather than the normal neutral, then it means there is a problem and we use RCD's to monitor if this has happened and trip the Live if so.

 

[snowhead]

I'M sorry but this thread reads like a child asking an adult WHY? WHY? WHY?

Are we there yet??

 

[morph]

Corrected

again i was keeping it simple
i dont see you actually trying to help anyone here