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House supply TT and loadings

Is there a limit to what an overhead supply can handle, loading wise?

Sorry if that sounds daft, I haven't worked with TT much in the past.

Existing house has an oven supply, no electric shower, and just your average size place with normal amount of circuits for a 3 bedroom house.

Fuse is 60/80A

A double garage is being built for a car enthusiast, he is requesting the following.

An electric garage door. ( no details as of yet )

Car Stacker Lift ( no details as of yet )

2 HP compressor

AC unit ( external condenser with one cassette inside ) ( around 4 amps )

General sockets and LED lighting.

Submain length is 45 meters.

My initial thoughts was to install a 10mm 2 core to a new DB which will be staked  SPD and RCBO's 

I can't see that the equipment will be used at the same time, at the most maybe the AC will be on while he is lifting a car in the air with a few general things plugged in and the lights on.

Compressor won't be used at the same time the door is being opened or a car is being lifted in the air for example.

I thought the 10mm will be ok on a 32A MCB protected by the 100ma main switch.

Now is is asking for a car charger. I have suggested a Zappy which is 7kw

So now I'm thinking of a 16mm 2 core on a 40A MCB

Your thoughts would be apreciated.

Parents
  • There is nothing magic about overhead lines - the maximum supply is  determined by the cable size and the transformer load. Some underground cables are pretty thin too .  Properly only the DNO can advise on what loads can be connected, and should be advised if large loads are being added. Strictly this need to notify applies to showers, cookers etc as well, but in practice no-one does.
    you may be able to follow the lines to the transformer with a pair of binoculars, and you can estimate what the Trx size is and how may properties it serves but that may not be the full story

    Find your DNO here https://www.energybrokers.co.uk/electricity/pes-areas/search

  • you may be able to follow the lines to the transformer with a pair of binoculars, and you can estimate what the Trx size is

    Or if they are powerful enough, read the plate.

Reply
  • you may be able to follow the lines to the transformer with a pair of binoculars, and you can estimate what the Trx size is

    Or if they are powerful enough, read the plate.

Children
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