supersound you can actually split into two section or more with single phase, just need to loop the L & N from incoming,

i did that for my house - incoming connect to two diffrent double pole switch then to elcb. one for downstair and one for upstair. they wont trip together. either way the connection should be incoming L/N to Double pole to ELCB x 3 min (one for outlets, one for Wh and one for lighting) to MCB generally malaysia used two elcb only.

good about 3 phase if one the tnb fuse in burn or down time, you still got 2 other phase might be up.