16mm tails with 100A fuse ???

[Wilko]

Job today to change out old fusebox and I'd noted the 16mm tails but on pulling the fuse this morning it was 100A which I wasn't expecting. Fairly recent new smart meter installed by XYZ who are also the DNO ... Shouldn't the fuse be limited to 60A in this case? Thoughts and advice appreciated

 

[westward10]

I guess you must C2 every domestic installation that has 16mm tails and a 100 amp fuse arrangement without consideration other than 'it's not the right size'

This wasn't the argument, the argument was the rating of said cable and my proposition that being partially contained should reduce the ccc. You have yet to give a flaw to this argument.

 

[Ian1981]

This wasn't the argument, the argument was the rating of said cable and my proposition that being partially contained should reduce the ccc. You have yet to give a flaw to this argument.

You've yet to confirm yours.
Show me evidence that cables need derating and to what method?
Then I'll come around.
Don't recall bs 7671 requiring us to derate cables entering a consumer unit or an enclosure in the appendicies with the list of reference methods it gives.

 

[Wilko]

Just ordered a couple of 60A fatboy fuses. Not saying where one might go

Edit : ok, just stop right there, you lot are just hopeless

 

[Dave OCD]

They must be around a fiver a go now ?

 

[Wilko]

They must be around a fiver a go now ?

Yes Dave, £3.83 from Discount Electrical.

 

[Deleted member 9648]

As has already been stated if there was a requirement to de-rate a cable entering an enclosure for termination clipped direct and free air installation methods would not be possible and would not be in the BYB.

 

[Dave OCD]

That's not too bad mate, worth it for peace of mind and not being criticised to death by W10.

Edit -reply to Wilko's post.

 

[westward10]

As has already been stated if there was a requirement to de-rate a cable entering an enclosure for termination clipped direct and free air installation methods would not be possible and would not be in the BYB.

Clipped direct would apply between service heads and meters etc. Once contained at its termination to a CU alternative ccc applies. Really quite simple.

 

[telectrix]

so what factor would apply to the cable rating just because it's inside a box? where in BS7671 does it say that a rating factor needs applying.

 

[Karin]

just for the craic, tne or other cables are usually stripped back to single insulated conductors inside an enclosure (so may closer reflect singles in trunking for that part), meter tails are usually sheathed right to the termination point. would this (how much?) affect the argument?
i've had a couple, there's no BYB in sight, i just wanted to get involved.. !

 

[Ian1981]

Then there's no point in clipped direct is there? , as the worst case de rating factor must be used for the cable /circuit therefore clipped direct could not be used as a cables ultimate reference method
Jesus!
Got to be a wind up this?
I'm done

 

[Gavin John Hyde]

Just ordered a couple of 60A fatboy fuses. Not saying where one might go

Edit : ok, just stop right there, you lot are just hopeless

The seal fairies will appreciate your sacrifice and offerings of new fuses and continue to keep you safe in your work!

 

[Dave OCD]

Then there's no point in clipped direct is there? , as the worst case de rating factor must be used for the cable /circuit therefore clipped direct could not be used as a cables ultimate reference method
Jesus!
Got to be a wind up this?

I doubt very much that he'll have much to say about this Ian.

 

[westward10]

I doubt very much that he'll have much to say about this Ian.

I have already stated clipped direct can be used between heads and meters etc..

 

[Dave OCD]

You've got the wrong end of the stick Westward, check my post again, I wasn't referring to you.