yes there are 0-gauge wires available in shoba.... most of them are cut up and in pieces with the plastic tubing on them. the only reason why i wont go with those wires is cuz they mite have rust in them due to the everyday exposure to rain, dust etc.
also check with him what is the rate he will be giving u the wire for cuz the lumna thailand 0-guage wire splfanatic has is for 700-meter.
tell ur electrician to get u the wire, take a pic and post it here so v can check if its really zero guage or less.