10mm Tails size

[newfutile]

During a recent EICR I have found 10 mm supply to the flat
This is fed from a Locked ryefield DB though a meter then a double pole 100 amp
Isolator , the outlet from the isolator is the 10mm 3 core possibly hightuff cable
This is over sleeved into the isolator.

My question is would the suppliers fuse if appropriately sized protect these cables?
And how to ascertain the suppliers fuse size or should this have a separate fused Isolator ?

 

[Rockingit]

Short answer is that you'll never know without inspecting the fuse in the carrier. Longer answer - how sure are you that they're only 10mm? Easy to confuse for 16mm. 10mm 6181y is rated to 65A so could well be a 60/63A service fuse in the Ryefield - I'm assuming this is part of a BNO system?

 

[buzzlightyear]

I agree what you are saying it very hard
Looking and thinking is it or could be 10mm or 16mm.

 

[newfutile]

I’m not 100% sure as they have no markings on them and I have just sized from eye , it is probably part of a BNO system as the ryfield feeds many meters and isolators to a group of flats

 

[westward10]

If they look like High Tuff which would be unusual for that type of circuit they could alternatively be split concentric.

 

[newfutile]

It’s not split concentric it looks like armoured cable without the steel wires present

 

[westward10]

You could try measuring it the overall diameter of three core 10.0 NYY-J is 17-18mm.

 

[newfutile]

That’s a good idea thanks I will next time I’m up there

 

[telectrix]

could it be just concentric?

 

[newfutile]

 

[westward10]

Is it the grey ones.

 

[newfutile]

You can compare the size to the 25mm tails here , even so I would need to confirm the fuse size and whether it’s permitted for this fuse to protect those cables

 

[newfutile]

No the grey ones are the 25 mm tails , its the ones at the rear going vertical
you can also see the 16mm earth joined to the black of the 3 core cable

 

[Rockingit]

Ermmm...... what size trunking is that? Those don't look big enough to be 25mm tails.

 

[newfutile]

I’m not at that site to measure but it is large trunking 150 mm or more maybe