Real or unreal

[cliffed]

Would you fuse 16mm 3c Swa @ 80 amps.

 

[Pete999]

Would you fuse 16mm 3c Swa @ 80 amps.

Lots of missing information Mate

 

[cliffed]

Yea I know,just wanting a true gut answer really.

 

[Pete999]

Yea I know,just wanting a true gut answer really.

Difficult to say when the details of the job are being withheld for some reason.

 

[Leesparkykent]

I would if the Reference method permitted it.

 

[Taylortwocities]

I would too, having done the CCC calculations.
To do CCC, I would need a LOT more information. As Pete says

Lots of missing information Mate

 

[cliffed]

Underground,approx 55 metres,the load would be definitely pushing 80 amps

 

[Taylortwocities]

You wanted a gut feeling?

The volt drop gut says no. 80amps over 55meters? Nah.
You'd need bigger.
Don't worry about the price, that nice Mr Corbin seems to be prepared to pay for anything.

 

[telectrix]

16mm buried will take 100A. otherwise my 1956 lead sheathed supply cable would have melted by now.

 

[Strima]

Buried on single phase max is 78 amps so no I wouldn't be fusing it to 80 amps. However is this a fixed load, one load, variable loads?

 

[cliffed]

You wanted a gut feeling?

The volt drop gut says no. 80amps over 55meters? Nah.
You'd need bigger.
Don't worry about the price, that nice Mr Corbin seems to be prepared to pay for anything.

Thanks,think I would Vote bigger too,it’s political on site @ moment.
[automerge]1575819339[/automerge]

Buried on single phase max is 78 amps so no I wouldn't be fusing it to 80 amps. However is this a fixed load, one load, variable loads?

Variable loads

 

[Dustydazzler]

I'm a cheap skate so would try it with 10mm

But my gut feel is it should be 25mm for 50-60M length

 

[Taylortwocities]

I'm a cheap skate so would try it with 10mm

That should keep the moles and worms nice and warm.

But look at the benefits, you could plant crops all along the cable route and get Avocado all year round!!

 

[Strima]

Thanks,think I would Vote bigger too,it’s political on site @ moment.
[automerge]1575819339[/automerge]

Variable loads

As there's a risk of overload then the cable size needs to be looked at again. At 80 amps design load your over the 5% threshold for volt drop. At a guess this is a distribution circuit and 25mm would be pushing it for volt drop when you take into account end of final circuits.

 

[cliffed]

Yea & the disadvantages melted cabling & Avocado relish.

 

[Pete999]

I'm a cheap skate so would try it with 10mm

But my gut feel is it should be 25mm for 50-60M length

I'm a cheap skate so would try it with 10mm

But my gut feel is it should be 25mm for 50-60M length

Slap in some 10mm2 that's what most people would do in this day and age no regards for the correct method, as long as it works tol the guarantee holds.

 

[PEG]

Are we allowed to know if it is 3ph,single,AC or DC ?

Duty cycle matters....could be a momentary pulse,of a really loud,80A door bell...