FLAT twin and earth

[ProDave]

The builders had just been and removed a wall and inserted an RSJ to support what was above



I don't think I have ever seen such a flat cable squashed between the RSJ and a joist.

It was still live and working.

 

[Sharpend]

Would be interesting to see what an IR test brings? 

 

[rapparee]

So which reference method do we use for this when we are carrying out calculations.

 

[kerching]

Would be interesting to see what an IR test brings? 

FLAT twin and earth....very FLAT

 

[Rob_the_rich]

So which reference method do we use for this when we are carrying out calculations.

Method N, nipped direct.

When working out the CSA, remember it is now height X width not pi R squared

 

[Murdoch]

Found this under a floor recently:

 

[Blue Duck]

Dewalt tool box!!!

Nice!

 

[Sharpend]

Some people have all the finds!!

 

[Murdoch]

^^  can't edit that out!

 

[kerching]

That's what I thought

 could possibly be twin lead BUT it is such a poor photo!

if it is twin lead my scrappers has a skip,full,of the stuff...gets it every day

 

[Murdoch]

OK.  A better picture ...



Yes lead T&E from about the 1920's ...... in not bad nick either.

 

[kerching]

BICC As well!.....never seen it with an Earth before, so that's a first for me!

 

[Murdoch]

BICC As well!.....never seen it with an Earth before, so that's a first for me!

Thats why I've kept some - rare as hens teeth ...

 

[roys]

Looks like a nice bench top top as well

 

[ProDave]

Method N, nipped direct.

When working out the CSA, remember it is now height X width not pi R squared

But no matter how flat you squash a round cable, the CSA will remain the same.

 

[ProDave]

The house where the flat cable was has been rewired twice.

Previous wiring was lead twin, still all there just chopped off at the ends.

Before that it appears to be cotton wrapped rubber insulated singles, L clipped to one joist, N clipped to the next. never seen that before.

 

[Rob_the_rich]

But no matter how flat you squash a round cable, the CSA will remain the same.

Not necessarily Dave, think of toothpaste tube with the cap off.

 

[Rob_the_rich]

The house where the flat cable was has been rewired twice.

Previous wiring was lead twin, still all there just chopped off at the ends.

Before that it appears to be cotton wrapped rubber insulated singles, L clipped to one joist, N clipped to the next. never seen that before.

Was the N clipped to the neutral axis of the joist?

 

[Andy™]

But no matter how flat you squash a round cable, the CSA will remain the same.

not if you squash it hard enough

 

[Sidewinder]

not if you squash it hard enough

Only if you put it into shear, or the start of shear.