60 amp main fuse

[arturas]

I'm doing a new installation in a 4 bedroom house,basicaly it's 60 amp main fuse,if the client will turn every light,every appliance&load the sockets,im sure 60 amp wil be not enough.i told that to a client that he needs an upgrade from edf, but he says he doesn't want to because it will take some time and money,he just want to finish the house and sell it,he will say that he bought the house with this electric installation so he doesn't need a sertificate. I came with idea to instal a 60amp double pole isolator before CU so if the load would be bigger then 60 amp the isolator fuse would blow instead of main fuse and then he will definately need to upgrade the main fuse. Or should i just not connect the cu until he will upgrade it?thanks

 

[Rockingit]

STOP! STOP! STOP!

Please recommend to the client that they use a qualified and experienced electrician who understands about load calculations, diversity and circuit protection properly, as this clearly isn't you.

If they do a search on this forum they will find someone in their area.

 

[Deleted member 19807]

why do you think your 60A fuse will blow before the DNO's 60A fuse?

 

[MarkieSparkie]

If you apply diversity and some common sense (e.g. intermittent loads switched by thermostats) to this installation you will probably find the 60A supply fuse is more than adequate.
Your double pole isolator idea is a non starter as you will not have discrimination between the two 60A fuses, so either or both fuses might blow.

 

[arturas]

STOP! STOP! STOP!

Please recommend to the client that they use a qualified and experienced electrician who understands about load calculations, diversity and circuit protection properly, as this clearly isn't you.

If they do a search on this forum they will find someone in their area.

First of all if people are not sure about something they are seeking an advice from people who has more experience,you don't have to be one of those unts who starts screaming: go and find a real electrician. f hell it's looks like you know f everything,what a f unt. go and sit in the dark corner and don't speak to anybody and if someone will ask where is a street with name a, answer to them go and get a tomtom. Oh wait you all-ready do that)

To MarkieSparkie: yeah mate i probably didn't think about what i said one of those moments when you say something and then start thinking..Applying diversity everything will be working perfect, but i counted the load like: the client will be cooking,boiling water in a cattle for cup of tea, washing clothes, drying them, left lights on everywhere, kid is washing a car with electric jet wash, bathrooms on full heating, and couple electric heaters if let say central heating failed. that way it will be a bit to much for 60amp. If that can't happen in real life then yeah 60 amp is enough.

 

[telectrix]

think you've answered you own question. rule of thumb. add up the total load and multiply by 1/2.

 

[Rockingit]

Sorry, but my comment stands. I don't know everything and would never claim to - ffs that's how I discovered this forum in the first place, having a problem I needed to get an answer for.

But I DO know about diversity, I DO know about system design and I DO know that any other competent electrician that has spent time on the road and time in a classroom does too.

This forum is full of threads about inexperienced electricians, and my thoughts are contained in many of them.

 

[Mark_Burgess]

arturas, could you please read THIS THREAD and take note of item 4!!!

 

[Knobhead]

You will have two BS88 fuses in line with each other. Get a coin and ---- it in the air, it has a 50/50 chance as to the side it lands on, it’s the same for the fuses. Don’t waste you client’s money. Ever heard of diversity, I think you should try it, gardening seems a good option.

 

[telectrix]

you can't blame to OP entirely, lads. yet another sparks thrown in at the deep end without sufficient experience. we don't know his level of competence. he may be OK on what he has been taught, or he may be in the wrong career, who knows.

 

[arturas]

I will better say nothing thanks to those who shared their opinion

 

[telectrix]

don't be disheartened mate. think grumpy's about tonight.

 

[arturas]

To say honestly mate i don't mind, if people feeling happy to judge people without seen their work or what they do,that's okey. I know what i'm doing, my foreman can see what i'm doing, my boss can see what i'm doing, and if i haven't been even 1 day without work for the last 2 years, i don't think i'm doing too badi formulated the question without thinking how i'm asking and what i'm asking, it had to be: in real life may it happen that one family switch all their electrics at the same time and blow 60 amp main fuse. It will always be possible. Same when people applying diversity to a cooker, there's all ways a possibility that people will use all 6 burners and oven and grill at the same time.

 

[Guest112]

can someone explain how they calculate load and an example of how they apply diversity just a random example???

thanks in advance

 

[Deleted member 26818]

can someone explain how they calculate load and an example of how they apply diversity just a random example???

thanks in advance

It varies.
Some add up the expected loads for all the fittings and accessories, then divide by 2.
Others follow the guidlines in the OSG.
Others again have their own methods.