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Identify this head unit

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leebut

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Hi guys


Came to do the testing on small bathroom lighting job today and I was confronted with this old piece of scrap iron.

I’ve never come across one of these before, so I’m asking you guys for confirmation of what I think what it is I’m looking for the type and BS number and amperage, so I can fill out my certificate, my thoughts are it’s a Bs 3036 semi enclosed rewire able fuses and guessing the fuse wire has been upgraded in the past from 30 amp to probably 60 amp.

I’ve already told my customer that they need to contact Electricity North West to have the head unit replaced as soon as possible for two reasons, the Bitumen has tracked back into the head and the live fuse is fully enclosed in the bitumen at the bottom and cannot be removed and the second reason it’s a fused neutral supply that’s no longer allowed be installed.

[ElectriciansForums.net] Identify this head unit
[ElectriciansForums.net] Identify this head unit
[ElectriciansForums.net] Identify this head unit

Cheers


Lee
 
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In this situation I email or phone the dno and submit a form to request upgrade..
I am in a lucky position though as over here in the iom we only have 1 dno and I’m on 1st name terms with all their staff who have a great rapport with the electrical trade..
 
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You'll probably want to record it as BS3036 but it actually pre-dates that standard by a few decades. I would generally not recommend opening CI cutouts. If anything is loose or broken inside, there is a much higher risk of short-circuiting the incoming service compared with all-insulated units, with resulting nasty arc flash. The supply impedances are often lower now than when they were installed (this one could be 90 years old) so their designers were not anticipating the kind of fireball that can occur today when blowing a 315A substation fuse.

That said, if anyone comes across disconnected / redundant ones, I need them for the collection.
 
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Charlie_ said:
In this situation I email or phone the dno and submit a form to request upgrade..
I am in a lucky position though as over here in the iom we only have 1 dno and I’m on 1st name terms with all their staff who have a great rapport with the electrical trade..
Click to expand...
Wish it was as simple over here bud I asked if the DNO could put an isolator switch in a couple of months back they said we don’t do that, so my response was how do I perform safe isolation then, they said we’ll get back to you, still waiting!!
Lucien Nunes said:
You'll probably want to record it as BS3036 but it actually pre-dates that standard by a few decades. I would generally not recommend opening CI cutouts. If anything is loose or broken inside, there is a much higher risk of short-circuiting the incoming service compared with all-insulated units, with resulting nasty arc flash.

That said, if anyone comes across disconnected / redundant ones, I need them for the collection.
Click to expand...
cheers for the info
 
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Charlie_ said:
In this situation I email or phone the dno and submit a form to request upgrade..
I am in a lucky position though as over here in the iom we only have 1 dno and I’m on 1st name terms with all their staff who have a great rapport with the electrical trade..
Click to expand...
Rung em last week over here for a main fuse upgrade and got told can’t talk talk to you need the homeowner, I had to write the homeowner a script as she had no idea what to say to them
 
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Total opposite over here..
Customer only signs the form to pay the bill, we do everything else, saves so much hassle..
 

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This happened to me a few months ago neutral fuse. I contacted the DNO immediately and advised the Landlord to shut off the power with a danger notice. The DNO told me to switch off the installation until they arrived. They came within an hour. I never knew what then transpired as the Landlord did not want to pay me to wait for them...
 
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Charlie_ said:
Test cert for dno with every job that needs their involvement
Click to expand...
Why can’t they all be the same, what’s the rules over there for pulling a fuse to do a board change??

Napit have been trying to get the DNO to agree to let registered sparks pull and temporarily resell a cut out for what seems like years now
 
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leebut said:
Why can’t they all be the same, what’s the rules over there for pulling a fuse to do a board change??

Napit have been trying to get the DNO to agree to let registered sparks pull and temporarily resell a cut out for what seems like years now
Click to expand...

We can’t pull the fuses, I’ve only ever done it a handful of times and that was for real emergencies to avoid disaster.

Our island is only 36 miles x 12 so doesn’t take long for them to attend site..
Trouble with sparks pulling fuses and re-tagging is that it is open to abuse
 
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