Zs on TT

[i=p/u]

What is the point in carrying out zs on TT system other than verifying a loop.
We got an Ra of 14.8 but when all bonding is in place it comes down to 1.9 ohms for most circuits zs results. I just don't see the point if rcd protected .

 

[Badged01]

What is the point in carrying out zs on TT system other than verifying a loop.

Unsure whether this is a wind up or you just dont know what Zs is for ......

 

[i=p/u]

What I'm saying the main switch will always trip b4 any breaker...

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As it's an rcd

 

[Billythekid]

What I'm saying the main switch will always trip b4 any breaker...

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As it's an rcd

And if the RCD fails to operate?

 

[ipf]

What I'm saying the main switch will always trip b4 any breaker...

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As it's an rcd

What about overload.......come on !!!

 

[DPG]

This should be an interesting thread. Daz

 

[MDJ]

Yes I was just thinking the same Daz LOL

 

[i=p/u]

Well forget overload , yous going off in your own tangent.

 

[Simonslimline]

If you didn't measure it then how would you know what the reading would be?

 

[Badged01]

If you didn't measure it then how would you know what the reading would be?

And what value would be acceptable ......

 

[i=p/u]

The rcd main switch is going to trip on fault current even before the mcb reach full operating current. So the trip times arnt met. Geeees are yous on the ale everyday.

 

[i=p/u]

On a TT system we rely on rcd as disconnection times arnt always met..

 

[Badged01]

Geeees are yous on the ale everyday.

Only on the days after I draw the dole ......

 

[ipf]

Well forget overload , yous going off in your own tangent.

:biggrinjester: Bit for that one. Getting on to trig now, are we ?

 

[Badged01]

:biggrinjester: Bit for that one. Getting on to trig now, are we ?

Nope. Thinks he's talking more scalar than vector .....