Computer RFC Testing???

[D Skelton]

Dunno bout anyone else but I'm learning.

Turns out what I was taught wasn't 100% accurate.

Thanks kingeri

 

[Elmer BeFuddled]

Dunno bout anyone else but I'm learning.

Turns out what I was taught wasn't 100% accurate.

Thanks kingeri

Does that mean my last statement (as I was taught) is wrong? I'd ask for a rebate if it was but I didn't pay!!

 

[Sintra]

The 2 cpc's definitely have to be tested as 1. Been thinking about this for a while and if they are joined throughout the circuit they are performing the same function.

 

[D Skelton]

Does that mean my last statement (as I was taught) is wrong? I'd ask for a rebate if it was but I didn't pay!!

Mate my college education was shoddy at best! The only saving grace was in my final year we had what you might say was an electrical guru at the front of the class, thank god this was when we were learning the important stuff! It was in this final year for example that we also had to re-learn almost everything from year two because we were taught most of it either wrong, or we weren't taught it at all! The muppet that was teaching us in year two was one of these "We do it like that coz it says so in the regs book, now no more questions" types, frigging infuriating!

I have learnt my trade mostly in my third year at coll, on site, through research and through knowing some pretty clued up sparks. I'm confident I know my stuff but I don't trust everything I learned at college, hence my carefully worded reply to paul.m's OP.

 

[Paul.M]

The 2 cpc's definitely have to be tested as 1. Been thinking about this for a while and if they are joined throughout the circuit they are performing the same function.

Sintra I cant be 100% sure that the 4mm earth single is touching the T&E on its entire run so I dont know that I would call it a cpc. Think I've just stated another question???

 

[D Skelton]

We need a guruuuuuuuu!!!!

Where are they when you need one most 'ey paul?

 

[Engineer54]

My solution would be to connect the 1.5mm CPC's in one of the socket outlets earth terminals, and the 4mm earthing conductors to the other socket earthing terminal!! At the CU/DB connect the 1.5mm CPC's in one termination on the earth bar and the 4mm earthing conductors into a separate termination next to the 1.5mm!!...Sorted!! As this is for IT purposes, the socket outlets will require 2 No's of earthing terminals at the socket outlet accessories (which most do these days).

 

[kingeri]

My solution would be to connect the 1.5mm CPC's in one of the socket outlets earth terminals, and the 4mm earthing conductors to the other socket earthing terminal!! At the CU/DB connect the 1.5mm CPC's in one termination on the earth bar and the 4mm earthing conductors into a separate termination next to the 1.5mm!!...Sorted!! As this is for IT purposes, the socket outlets will require 2 No's of earthing terminals at the socket outlet accessories (which most do these days).

That's exactly what I do, and on the last IT install I did, this is what was specified.

D Skelton - I only learned this myself whilst on a job - it was the way the (more experienced) guys did it, so I can't claim any special honours.

 

[Chr!s]

Sintra I cant be 100% sure that the 4mm earth single is touching the T&E on its entire run so I dont know that I would call it a cpc. Think I've just stated another question???

The 1.5 will termimate on one side of the socket, the 4 mm the other, i think you are missing the point of what it is your trying to acheive.

You need a hoigh integrity connection for the Protective Conductor of the final circuit, this is due to the risk of electric shock if the earth connection it lost.

The 1.5 terminated in two sepertate terminals on the socket would acheive this. You have added a 4mm into the design also, not needed but no problem. As i stated earlier and as E54 stated, 1.5 one side 4mm the other, the 4mm will be in paralell with the 1.5.

Take the furthest point where the 4mm Radial ends, that will be you R2, the three cables in paralell.

 

[KAS1]

Perfect interpretation of 543.7.1.103 (iii)

only 1 reading is to be recorded , and as the 4mm is performing the role of cpc as well as the t&e , then take measurement of both combined would be my solution.