Amperage into house

geographica

was reading somewhere recently that there should be a minimum of 100amps going into a house, I looked into the box at the side of the house and there’s a picture attached

we do get quite a few cut outs where the main switch in the consumer unit trips, switch it back up and all is ok again 🤷🏼‍♂️

Wonder what is, if any, the issues with having a 60/80amps vs. a 100amp unit into the house??

any help/advice would be appreciated, TIA

maybe it doesn’t matter and the cut outs are just one of those things🤷🏼‍♂️

Calahonda52

Where did u read that: I dont believe it is correct to say 100

You should never think this

maybe it doesn’t matter and the cut outs are just one of those things

geographica

i can’t actually remember but I did google it and it states new homes are Min 100amp

geographica

Yeh that’s why I created a post to get some advice from the experts

newuser...

ESBN fit an appropriate fuse according to the MIC 80/100A for 12/16kva afaik

These fuses shouldn't blow in normal operation where the maximum demand remains below the MIC

The consumers main mcb or fuse is designated as the installations "main overcurrent protective device" and presumably should trip or blow before the esbn fuse.

The main mcb shouldn't be seen as a target either . An installation should be operated at or below the theoretical maximum demand figure which from memory is about 50A for a standard 12kva installation and 65A for 16kva

Non sparks often work on an assumption that overloading an installation means a mcb or fuse will blow safely. This is not always the case and the results can be unpredictable or hazardous.

geographica

thanks, and would there be any benefit to have a sparks change that to a 100/200 or more amps?

Or would that be an ESBN job?

newuser...

https://www.boards.ie/discussion/comment/123313860#Comment_123313860

Consumer Installation and Esbn Supply need to be upgraded at the same time

To upgrade from 12> 16kva MIC , Esbn may simply swop their fuse out or it could be the installation is fed from old overhead lines or whatever and they decide it needs more than a fuse swop

Consumers Installation then needs a similar upgrade, Enhanced main board etc

geographica

any tangible benefit to having it increased to at least 100amps? It’s a 5 bed detached house

newuser...

https://www.boards.ie/discussion/comment/123314042#Comment_123314042

You need to be more specific

"5 bedroom house" says nothing about electrical requirements

Esbn fuse sizing isn't a consumers concern. Esbn give the consumer a contracted MIC . That's what you work off

Calahonda52

https://www.boards.ie/discussion/comment/123314042#Comment_123314042

OP you need to deal with this

we do get quite a few cut outs where the main switch in the consumer unit trips, switch it back up and all is ok again 🤷🏼‍♂️

newuser...

He needs to say what's going on there when it's tripping . Could be excessive usage or a problem at the main mcb

geographica

https://www.boards.ie/discussion/comment/123314662#Comment_123314662

Well there’s nothing specific, maybe when the shower is on but in the main no specific reason

in not enquiring into why it trips though

newuser...

https://www.boards.ie/discussion/comment/123314751#Comment_123314751

You're not enquiring but it may be a problem . Main mcb tripping shouldn't be a regular occurrence

Could be simple overload or even faulty mcb or issue at mcb

Your other question on 100A fusing can't really be answered based on zero information provided. But yes it's probably preferable for domestic to have 16kva at a minimum.

The ESBN fuse size is of zero concern to the homeowner. It's a very rare event for them to blow .

Let me guess you're charging batteries ?

Calahonda52

https://www.boards.ie/discussion/comment/123314751#Comment_123314751

https://www.youtube.com/watch?v=I_izvAbhExY

newuser...

Esbn are contracted to supply 16kva for example ,which is the supply capacity they undertake to supply reliably to the consumer and fuse accordingly at 100A afaik

Their fuse sizing should be of no concern to the consumer

I'm not too well up on the use of design current , MIC and max demand, the last one one can be measured anyhow and supply upgrade sought if needed. For big new work (commercial etc ) there will be plenty of tolerance built into the supply capacity as upgrade is major .

Esbn actually had a guide on domestic mics fwiw anyhow

geographica

https://www.boards.ie/discussion/comment/123314088#Comment_123314088

Well it says that there is a bigger family hence more use of power

newuser...

https://www.boards.ie/discussion/comment/123318180#Comment_123318180

Ya still tells ya fa

Type of heating, cooking, car charging, batteries , welding, showering whatever ya get the idea

geographica

nice language, it tells you that there’s 4 showers and 7 people in the house so one could gather draw from the amount of people in the house no, given the number of bedrooms? Maybe not

All of the above are used, except a welder

newuser...

https://www.boards.ie/discussion/comment/123318378#Comment_123318378

No im 40 years looking at jobs and no expert either

Family of 5 large house whatever tells u nothing

It's ok I understand u have no idea

Anyway ur basic query on 100A ya an 80A board is preferable to the standard 63 amp

geographica

a bit humpy aren’t you

thanks for your contribution

JL spark

another thing to factor is ,

Upgrading your esb supply ,

New mains cable

New 16kva rated fuseboard

Testing of whole house

All above if done properly,adds a lot to the cost 1000s

newuser...

5 bed house

4 showers whatever that is

Ill maybe read back and see of provided any more information than . Gets upset then when he's told he ain't providing any info.

ted1

https://www.boards.ie/discussion/comment/123314751#Comment_123314751

You need to look at the issue. There is obviously an issue somewhere.

Was the shower installed after the house was built. If you are tripping for over current a priority switch should have been fitted

there may be an easy fix, it might just be faulty breaker

ted1

https://www.boards.ie/discussion/comment/123318378#Comment_123318378

Tells us nothing. The 4 showers could be gas heated..

newuser...

Waste your time wired for broadcast not reception as saying goes

geographica

https://www.boards.ie/discussion/comment/123325659#Comment_123325659

Thanks will get an electrician in, there is a new electric shower in place of an original one, Triton t90 for new version but not sure if the “cut outs” are only since that was installed. I’d have to check with the boss 😜, the cut outs aren’t regular and not specific to the shower being on though, I watched to see if it happened when a shower, washing machine and dishwasher was on together but no, nothing happened. Hard to pin down

geographica

1 electric (Triton where water heater at the unit)

3 pumped electric (where water used is from hot water cylinder)

max only two used at once

newuser...

Could be the electric shower doubled up with car charging or something , hard to say , may not even be overload

Presumably a 63 amp main mcb