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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
 

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Looks like 20mm galv conduit

wonder what rating they put on the certificate
 
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.
 
It was this one.
 
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.
 
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?
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I guess curiosity resulted in them opening once out...

OK I should have read the text more carefully, no replacement just checked tightness. Doh!
 
Why did you pull that link?
And that DB is a mess start in there and don't worry about a DNO cutout
 
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?
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I guess curiosity resulted in them opening once out...

OK I should have read the text more carefully, no replacement just checked tightness. Doh!
There is an isolator between the meter and cu.

So no need to pull the link.

Edit

Also - the tails look too thin to me - single layer of insulation?
 
I would suggest the main switch in the DB has been replaced following a burnout, but not by a competent person as the isolator is not of the correct manufacture and the damaged conductor has not been rectified. It would be interesting to see how the busbar is connected given that the L and N connections are on the wrong sides
Edit post crossed with pc1966 who is clearly thinking the same
 
It would be interesting to see how the busbar is connected given that the L and N connections are on the wrong sides
Well spotted, that also explains the neutral being nicked by the fixing screw post!
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Also - the tails look too thin to me - single layer of insulation?
Yes, another good point as no sign of a second sheath.
 

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