Zs

[m1ck_b87]

When calculating Zs I use R1+R2 x 1.2+ ze. Does any1 else apply the temperature factor

 

[linfield-sparky]

Why 1.2 as temp factor?

 

[m1ck_b87]

To allow for rise in temperature

 

[grahamgas]

Thought you multiplied the final zs by0.8

 

[linfield-sparky]

Yes but we're r u seeing that figure, don't have any books to hand.

 

[gazzamikes]

That's the gn3 method isn't it? Surely you only know this when you know the temp of scenario?

 

[NigelMarsh]

As Zs is used to calculate whether the protective device will open quickly enough if a fault occurred, I assume that during any fault the cable would pretty quickly rise to its maximum operating temperature, so using the GN3 1.2 multiplying factor on the R1 +R2 measurement makes sense to me when calculating maximum Zs??

 

[MDJ]

When calculating Zs I use R1+R2 x 1.2+ ze. Does any1 else apply the temperature factor

No I always test circuits with an instrument and get the ZS every time, I can't think why I would need to calculate this essential reading at all on any circuit, please humour me and let me know why you would.

 

[Jay Sparks]

No I always test circuits with an instrument and get the ZS every time, I can't think why I would need to calculate this essential reading at all on any circuit, please humour me and let me know why you would.

I left my tester at home.....lol

 

[MDJ]

I left my tester at home.....lol

Not acceptable Jay hehe

 

[Silly Sausage]

No I always test circuits with an instrument and get the ZS every time, I can't think why I would need to calculate this essential reading at all on any circuit, please humour me and let me know why you would.

I don't know how to use an Earth Loop Tester. I get Ze by enquiry.

 

[Jay Sparks]

Not acceptable Jay hehe

I know mate but you get them threads that say, "I was on a job fault finding and I didnt have my tester as it was at home, what could the fault be????" lol

 

[MDJ]

I don't know how to use an Earth Loop Tester. I get Ze by enquiry.

Liar :smilielol5:

 

[Olec]

I'm like an electrical psychic. I just touch the relevant wiring accessories and using me extra sensory perception I get readings. Much easier, no need for test kit or calibration, and all my readings are within the regs too!

 

[markc123]

Or just make up a reading...

JOKES!!!!!!!!!!