just a question, must the internal (wiring from meter to DB and DB box re-wiring) work has to be started right after TNB done the external work(3 phase wiring pulled, change meter panel and meter) ?

Can it like once TNB done, then TNB connect back existing 1 phase internal wire, electricity resume as normal, until schedule another time with contractor to do internal work.

I got this
the wires from meter (1 live 1 neutral) to internal DB is concealed --> require own assign electrician contractor to lay new wire from meter to internal DB and do the balancing.

I have a house at hometown where I'm not always back. I am wondering, can I first apply arrange with TNB to do the external wiring first, including changing the panel n meter.
TNB pull 3 wires (red, blue, yellow and 1 black neutral) to the meter, but only use one phase first with existing internal wire. the other 2 remain hanging uninstall.

So I can arrange with own contractor to do the rest internal work (hack and lay new cable from meter to internal DB, on another schedule.

ok , got it, thanks