Sigh... Too cheap the contractor not interested, To expensive the customer not interested..

Just want to clarify, is ELCB same as MCB? and MCCB bigger type of MCB?

if im not mistaken

ELCB = earth leakage cb
MCD = miniature CB
MCCB ? never heard before

ELCB = earth leakage circuit breaker.
Detects leakage to earth.

Newer technology which does the equivalent job of ELCB is RCD = Residue Current Device
Detects residue current between L & N.

MCB = Miniature Circuit Breaker
Protects circuit from over current. Handles lower fault current.

MCCB = Molded Case Circuit Breaker
Same as MCB but can handles higher fault current due to it arc containment design and material.

guys,

what is the max number of Aircond we can have in single phase

i recall that one aircon installer mentioned 4-5units 1HP AC. I actually don't know how accurate is that... Maybe someone else can elaborate & confirm this...

That means we can only find MCB in the DB in common house (i.e new 2-storey terrace from developer). will there be any ELCB installed as well?

I reckon ELCB and MCBs are standard components in the DB

1hp = 750w x 5/pcs = 3750/240v = 15.6A. 1phase = 60A

Need to add in startup, and wastage/losses. Factor in 20% will be good, if no water heater can put 10 units too.

Factor till 100% also you have more than enough.