Got My New Regs Book Today.....

[Dairyspark]

Today was a fun day lol got myself a new set of fluke test lamps (T110) and my new regs book and osg. And after a quick look through I have a question lol. Now to my understanding you could calculate max Zs by taking instant trip current and diving the voltage by said current and you got max Zs, however since they have changed these values, how can I work them out now, closest I got was using 220V

Any ideas?

Cheers

Bobby

 

[Blue Duck]

Are you using the OSG?

I think they made a bit of a boo boo with the table in the OSG and GN3

 

[Dairyspark]

No it's from the big book, just made it easier to work out on the fly as I don't always have my books with me.

 

[NozSpark]

It's probably 230V - the 5% to use the lowest allowed supply voltage.... I don't think they take the 80% value in BS7671,,, like they do in the OSG

 

[Dairyspark]

Very well done Noz that's exatly what it is haha

I would also have seen this if I had read the small print under the table saying that the values have been calculated using 95% of minimum voltage haha

 

[Andy™]

i hear the next version will be using Zs values based on 110v... then a 50% correction factor just for the hell of it. just guessing since they have changed them in every new book...

 

[Sharpend]

i hear the next version will be using Zs values based on 110v... then a 50% correction factor just for the hell of it. just guessing since they have changed them in every new book...

Bitter!?

 

[Andy™]

they have changed it every time... i wonder how many times it has actually caused a problem or not tripping in time (so needing changed), or if its just someone with thousands of qualifications but has never been out of an office

 

[kerching]

I got the T150 from MM 18 months ago!

The T 150 vibrates!

How cool is that!

Just liking

 

[Andy™]

i hope youre not using it for non-electrical purposes

 

[Dairyspark]

So does the T110 when you press the switchable load lol I like the self test function, pretty neat

 

[kerching]

i hope youre not using it for non-electrical purposes

I was only saying to Rachel and Emma the other day....."you two look a little peaky, would you like me to check you over"....Rachel,rolled over and slipped the top of her basque down to waist level.....then I woke up and had to go to work!

To be contiued