how insufficient? I recommend you check the wire size, is it 2x10sqmm or 2x16sqmm, etc. ? I faced the same in my Bangkok house, since I'm an engineer I did all the house upgrade myself. We had 2x16sqmm (line + neutral) on the standard meter (15/45A) it was enough for the house. Once I added the 32A charger, I went ahead and upgrade all the way to 35sqmm wires. it was also 30 meters from meter to main board, I had to buy a 100m roll which was 9,000 baht 6 years ago, today it's 16,000-20,000 baht after copper prices skyrocketed. Do not wire a secondary cable from the PEA/MEA meter, really, do not do that. instead figure out the how insufficient the cable is, is it borderline insufficient, or sufficient without having all the air conditioners or water heater running? My recommendation, since it's only 30 meters, can even upgrade to 25sqmm that is not so expensive as 35sqmm. or another option cheaper and simple, but not what I prefer personally: get another meter, wire a new 10sqmm wire or even 16sqmm for future proof.
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