What the hell is this main fuse?

[JohnS888]

Hi All

On a job this morning doing an EICR. As you will see from photos main live conductor showing signs of burning out at termination. Checked tightness of termination and main switch all seemed fine. I thought I would check main fuse rating to see rating of this. Supply is tncs with 16mm live conductors and 10mm main earth. On checking main fuse I come across what you can see in photo. A hollow round tube in fuse link terminals. This surely isn't legit? The fuse was sealed so I assume it was supplier that put it in

 

[David Prosser]

Maybe it was sealed by the same person who seal the consumer side of the isolator.

 

[Dustydazzler]

Looks like 20mm galv conduit

wonder what rating they put on the certificate

 

[snowhead]

The clue is the Red carrier.
That's a supply to a Flat / Apartment in a multi flat /appartment property.
All sourced from a single supply to the building.
Looks like an aluminium link.

 

[JohnS888]

Maybe it was sealed by the same person who seal the consumer side of the isolator.

So the presence of the isolator totally does away with need for the fuse? Thing is this is rated at 100 amps and pretty sure was 16mm main live and 10mm earth

 

[David Prosser]

So the presence of the isolator totally does away with need for the fuse? Thing is this is rated at 100 amps and pretty sure was 16mm main live and 10mm earth

Eh? Not sure what you mean by that.

 

[radiohead]

So the presence of the isolator totally does away with need for the fuse? Thing is this is rated at 100 amps and pretty sure was 16mm main live and 10mm earth

there will be fused protection at the building intake to each flat

 

[Julie.]

It's not a fuse it's a link!

This is fused upstream somewhere.

There will be an incomer to the property, at this point it will split into several fused supplies - one to each flat for example.

In the flat there will be a link - clearly marked as it will have a dark red / maroon coloured holder.

 

[DPG]

Wasnt there a similar thread the other day?

 

[westward10]

It was this one.

UK - Fuse link

Hi folks, Can anyone tell me more about a fuse link (I came across several in a communal cupboard today) . Was not expecting this and immediate thought was Bodget and Scarper had been here. Best described as a brass link similar to a piece of galv pipe inserted in place of a BS88..hence my concern!

www.electriciansforums.net

 

[snowhead]

And if you Google DNO cut out red fuse carrier within 0.36 of a second there are thousands of pictures and replies explaining what they are.

 

[Strima]

You need to find the main incomer to the building.

And be wary of pulling main fuses, this should be left to suitably trained and equipped persons.

 

[westward10]

No idea why you pulled that sealed link.

 

[pc1966]

No idea why you pulled that sealed link.

Judging by the photo of a burned conductor at the incoming switch I presume they were going to replace the cable & switch so needed it off?
[automerge]1591102494[/automerge]
I guess curiosity resulted in them opening once out...

OK I should have read the text more carefully, no replacement just checked tightness. Doh!

 

[hasel5]

Why did you pull that link?
And that DB is a mess start in there and don't worry about a DNO cutout