Electrical certificate.

[SarahB]

Hi everyone, can I ask a quick question please? If you use a Henley block, and install a separate DB, can you forget about the 100 amp incomer on the original consumer unit? i.e. it wouldn't apply as far as your paperwork is concerned as you've installed say a separate 3 way board? So the paperwork just reflects this part of the installation?
Sorry if this is a stupid question.

 

[SarahB]

Thank you Gary, that makes sense. I was thinking of the main incomer on the original consumer unit rather than the main fuse. If the scenario you mentioned was to occur, would it be fairly simple to upgrade the main fuse?

Anyone? Please. Thanks in advance.

 

[GaryM]

Not simple, no. You would need to apply for a supply upgrade to your DNO where there would probably be a cost. There's no guarantee they'll agree to upgrade though.

 

[telectrix]

but if the DNO fuse is 60A or 80A and you blow it, DNO might be inclined to upgrade to 100A.

 

[GaryM]

Even a 60A fuse will take some blowing - approx 110A for 60mins!
In reality, most domestic installations will never trouble a 60A fuse.

 

[SarahB]

That's all great info chaps, many thanks indeed. You're all so helpful :tounge_smile:

 

[GLENNSPARK]

The actual amount of current draw for pieces of equipment rarely gets to actual rated demand...take cookers for example.....the first 10A then 30% of the rest...unless the cooker switch incorparates a socket of course thenits +5A...hardly...DNO fuse busting stuff is it...and a cooker can be assumed to be one of the heavier loads encountered within a domestic scenareo.....

 

[davie spark]

Maybe there should be a 'STUPID QUESTION' forum then for members to post 'stupid' but 'clever' jokey questions, if you get my drift. i.e.
I've been asked to install an electric chair in Barlinnie prison because the SNP government are determined to reintroduce capital punishment, as this is 'government' work I'm keen to comply with current regulations so do you think I should install an RCBO?

 

[GaryM]

Not sure what you're getting at Davie but what might seem a stupid question to some rarely is to others. I wouldn't like to think people are afraid to ask for fear of being ridiculed just in case somebody considers it a stupid question. It's a forum after all.