16mm T&E tails on 100amp fuse

[haptism]

Did a job earlier in a new build, part of a 5 year old new build estate in the darkest depths of kent. Anyhow opened up CU and saw 16mm tails so assumed would be on 80a fuse as there not huge demand. Then outside to check service head and main fuse is labelled 100a ?, the tails are 16mm t&e.
I did nor remove the fuse carrier to check the actual fuse as it was sealed

Anyhow my point is, ive already installed new circuit and have to issue an EIC, I will be writing in comments box write what I found and that it looks wrong. However looking forward what should I do about this. The customer wont be happy me turning off all the power; I told him to contact the people he bought the house from and raise the point.

Another thing I found includes a spur that don't switch off the load in garage that its labelled to do. Its not right is it, brand new house as well, and theres hundreds of them.

 

[Toneyz]

Im not entirely sure as all wiring is back entry into CU, proper tails go from main DNO Fuse to meter and then to switch fuse; from the switch fuse its t&e. So I assume yes it goes to CU

So there is a switch fuse protecting a sub-distribution circuit (sub-main) is this fused down to 60A?. The other issue is the method of its installation.

 

[haptism]

So there is a switch fuse protecting a sub-distribution circuit (sub-main) is this fused down to 60A?. The other issue is the method of its installation.

Its not a sub main, its a semi detached house with its own single phase supply. The switch fuse is there as the tails are longer than 3m, the load side of the switch fuse is t&e which I can only assume is going the the CU. The switch fuse has 100a on it

 

[Strima]

If it's a switch fuse the consumer side of the meter then you can remove the fuse to check.

 

[haptism]

If it's a switch fuse the consumer side of the meter then you can remove the fuse to check.

Yeh I will do tomorrow

 

[haptism]

But still the tails not rcd'd

 

[Toneyz]

Yeh I will do tomorrow

post up some photo's so we know what you are describing.

 

[Toneyz]

If you are saying that the meter tails are 16mm from the switch fuse with hopefully a 60A fuse that is perfectly acceptable as long as certain criteria is met overcurrent is afforded by the 60A fuse so just need to ensure there is short circuit protection.
It is the same principle that you find when switch-fuses are joined onto a bus-bar chamber.

 

[Dave OCD]

I'd say that by virtue of the switch fuse being present the 16mm T&E is a sub-main. I'd just check the fuse in that and fit a 60a cartridge if necessary. And it's only recently that this sub-main requires RCD protection to be compliant [Assuming reasonably low Ze] so in my opinion that doesn't make it dangerous. Just note it on the certificate.

 

[haptism]

I'd say that by virtue of the switch fuse being present the 16mm T&E is a sub-main. I'd just check the fuse in that and fit a 60a cartridge if necessary. And it's only recently that this sub-main requires RCD protection to be compliant [Assuming reasonably low Ze] so in my opinion that doesn't make it dangerous. Just note it on the certificate.

Okay, never considered that would be called a submain so that's good info. Will check tomorrow when the house was constructed but im sure it no older than 5 years.

 

[Toneyz]

The regulation regarding a cable buried within the wall at a depth equal or less than 50mm being RCD protected has been around from at least 2008 17th edition reg 522.6.6 refers.

 

[GLENNSPARK]

Did a job earlier in a new build, part of a 5 year old new build estate in the darkest depths of kent. Anyhow opened up CU and saw 16mm tails so assumed would be on 80a fuse as there not huge demand. Then outside to check service head and main fuse is labelled 100a ?, the tails are 16mm t&e.
I did nor remove the fuse carrier to check the actual fuse as it was sealed

Anyhow my point is, ive already installed new circuit and have to issue an EIC, I will be writing in comments box write what I found and that it looks wrong. However looking forward what should I do about this. The customer wont be happy me turning off all the power; I told him to contact the people he bought the house from and raise the point.

Another thing I found includes a spur that don't switch off the load in garage that its labelled to do. Its not right is it, brand new house as well, and theres hundreds of them.

The distributers protection (service head bullit) on a condition report should normally be recorded as a "LIM"...

Next, use your intuition to determine what the max. Demand for each supply is/should likely be...
P.S.
It won't be 80 chuffin amps...thats for sure...


The bigger issue here for me...is whether or not it complies with the requirements of certain DNO's in regards to length of run from the service head (usually 3 meters...i think)...

 

[DPG]

The bigger issue here for me...is whether or not it complies with the requirements of certain DNO's in regards to length of run from the service head (usually 3 meters...i think)...

It's fed from a switch fuse though.

 

[GLENNSPARK]

It's fed from a switch fuse though.

So then I can't understand what he's Bleating about...

 

[davesparks]

Its not a sub main, its a semi detached house with its own single phase supply.

Submain Is the common name for any distribution circuit which is part of the consumers installation. The type of property or incoming supply is irrelevant, if it is a circuit with ocpd etc on the consumers side of the meter and it feeds a DB, CU etc then it is a submain.

 

[haptism]

Checked again today and switch fuse has an 80A. Took some pics of the t&e serving the CU, as you can see theres no glands, no cleats, no rcd to be found. Not sure if theres mechanical protection where the t&e goes into building; what are your thoughts on this. The building was constucted in 2016.