Zs

[cliffed]

Brain dead at the mo,a 100 amp bs1361 fuse max Zs is .030,so how come tncs supply allows max 0.35 & tns supply allows max .80,surely the main fuse must comply to max allowed Zs in bs7671,any thoughts cheers

 

[Plonker 3]

We don't have anything to do with the DNO side of stuff, that's there problem.

 

[Plonker 3]

Oh and your max Zs figure is wrong too.

 

[cliffed]

Oh and your max Zs figure is wrong too.

Ok how wrong

 

[Plonker 3]

Look it up in the BGB

 

[cliffed]

Look it up in the BGB

thxs your helpful

 

[Plonker 3]

Look like it, anything you I can do for you? Make your tea, bring you a beer, tuck you up in bed, change your nappy?

 

[cliffed]

No thxs I think it's you who needs help ha ha

 

[Plonker 3]

Really? I know the correct figure you don't.

 

[Deleted member 72666]

Look like it, anything you I can do for you? Make your tea, bring you a beer, tuck you up in bed, change your nappy?

Are there any biccies going with that tea?

 

[ipf]

No thxs I think it's you who needs help ha ha

Start with your maximum Ze...

 

[Badged01]

If you can find a table that quotes for "BS1361" ......

 

[Plonker 3]

Are there any biccies going with that tea?

Of course, what would like, I have bourbons, custard creams and of course Hob Nobs

 

[cliffed]

Correct, I'm still lookin for bgb,the tns max will not be anywhere near the required Zs for the 100 amp fuse,& just wondering how that will comply at the cut out end

 

[dazza1981]

Of course, what would like, I have bourbons, custard creams and of course Hob Nobs

I will have a beer please Dill thanks buddy

 

[Plonker 3]

If you can find a table that quotes for "BS1361" ......

True, I used a app on my phone to look it up lol

- - - Updated - - -

I will have a beer please Dill thanks buddy

No worries, a can of Skol is on its way.

- - - Updated - - -

Correct, I'm still lookin for bgb,the tns max will not be anywhere near the required Zs for the 100 amp fuse,& just wondering how that will comply at the cut out end

Read my first reply.

 

[SirKit Breaker]

The reason for the difference in Ze values between TNCS and TNS is:

TNCS shares it earth fault path with the Neutral supply conductor.

TNS earth fault path is down the steel casing of the supply cable.

This is also the reason that PSCC/PEFC on TNCS are roughly the same, and on TNS they can be significantly different.

In any case, the max Zs and disconnection times in BS7671 apply to either supply type.

Cheers………….Howard

 

[cliffed]

The Zs mentioned should be Ze sorry bout that,these are Ze max,provided by power suppliers

 

[Silly Sausage]

cliffed, find out what BS1361 has now been replaced with and your search may prove more fruitful!

 

[cliffed]

Ok ,thxs