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Amperage into house

  • 30-03-2025 11:44PM
    #1
    Registered Users, Registered Users 2 Posts: 992 ✭✭✭


    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🤷🏼‍♂️



Comments

  • Registered Users, Registered Users 2 Posts: 13,243 ✭✭✭✭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

    “I can’t pay my staff or mortgage with instagram likes”.



  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭geographica


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



  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭geographica


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



  • Registered Users, Registered Users 2 Posts: 62 ✭✭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.

    Post edited by newuser... on


  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭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?



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  • Registered Users, Registered Users 2 Posts: 62 ✭✭newuser...


    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

    Post edited by newuser... on


  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭geographica


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



  • Registered Users, Registered Users 2 Posts: 62 ✭✭newuser...


    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



  • Registered Users, Registered Users 2 Posts: 13,243 ✭✭✭✭Calahonda52


    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 🤷🏼‍♂️

    “I can’t pay my staff or mortgage with instagram likes”.



  • Registered Users, Registered Users 2 Posts: 62 ✭✭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



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  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭geographica


    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



  • Registered Users, Registered Users 2 Posts: 62 ✭✭newuser...


    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 ?



  • Registered Users, Registered Users 2 Posts: 13,243 ✭✭✭✭Calahonda52


    “I can’t pay my staff or mortgage with instagram likes”.



  • Registered Users, Registered Users 2 Posts: 62 ✭✭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



  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭geographica


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



  • Registered Users, Registered Users 2 Posts: 62 ✭✭newuser...


    Ya still tells ya fa

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



  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭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



  • Registered Users, Registered Users 2 Posts: 62 ✭✭newuser...


    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



  • Registered Users, Registered Users 2 Posts: 992 ✭✭✭geographica


    a bit humpy aren’t you

    thanks for your contribution



  • Registered Users, Registered Users 2 Posts: 250 ✭✭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



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  • Registered Users, Registered Users 2 Posts: 62 ✭✭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.



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