BICC MK2 identifying dno cut out in domestic premises

[uksrevivor]

Hello all forum users.
I am currently training as an electrician and have been able to identify some DNO cut out fuses rating but i have one in a rented property im staying in that has no identifying marks on it apart from BICC MK2. It looks old.
My question is is this a standard pull out isolator contaning a common BS 1361 fuse rated 60/80/or 100 amp or is it something else
It looks like an old unit and i have not come across this before. I must stress that i have no intention playing with this myself as im not an electrician im only training and have limited experience at the moment i just look at it and wonder how would you experienced sparks tell what its rating is when its not marked. Is this a common unit found in many properties.
Any advice would be appreciated.
Many thanks.

 

[davesparks]

Post up a picture so we can have a look

 

[uksrevivor]

Im hoping this works

 

[davesparks]

It worked.

There's no way of knowing for certain without opening it up, which there's not much point in doing if all you want is to read the writing on the fuse.
What we do know however is that it will not be more than 100A so you can safely base design decisions about tail size etc on this.
From experience I would expect that to have a 60A fuse in it with a TNS earthing system supplied by a lead sheathed service cable.
That cutout has been designed specifically for lead sheathed cables, you'll see just below the fuse carrier there is a piece of plastic which looks like it will slide out, this is where the hot sealing compound would be poured in once the cable had been terminated.

 

[uksrevivor]

Many thanks davesparks that's most usefull
Thanks button hit m8

 

[7029 dave]

Yes as ^^^^ am confident 60 amp cut out.

 

[davesparks]

Many thanks davesparks that's most usefull
Thanks button hit m8

No worries,
Wait and see what others have to say about it too, I'm inly taking an educated guess based on experience.

 

[Mighty Chum]

Not sure if Im necro'ing a dead post here but I'll crack on.

I have the same unit as the OP. No marking that shows it's rating save for "BICC" "Mk2". I haven't cut the tag to look underneath as I am still training and not working for my supplier.

I wanted to a) change the consumer unit in my house, finally get some RCD protection plus gain some ways so that I can, b) put a power shower in.

I've been advised that I'll likely need a 40a breaker for it and I'm not hot on the idea of installing it without RCD protection, water n electric are just too friendly to risk it.

How would you guys go about discerning what incoming you've got? Should I ring my supplier? Get my mentor to cut the seal and check the fuse? Measure the size of the incoming cable and make an educated guess on its rating?

Thanks in advance, one confused trainee.

 

[Richard Burns]

Just assume it is a 60A fuse and work from there.
Do not install an electric shower without 30mA RCD protection as it is a requirement of the regulations that a circuit in a bathroom or shower room must have 30mA RCD protection.