true, inverter is safer, on this issue.

but also for basic units that is not 20years old,
the compressor motor drive circuits also got ICs, current limiters and various diodes le.

and! when you turn on the aircon, the compressor dont kick in immediately.. its usually 5-10 seconds later than the blower unit starts to run.. and for that 0.1 second during motor start you dont draw 10amps and blow everything on your drive circuit PCB!

We're not talking about a single unit compressor.. The issue is maximum demand..

The maximum current load as in he already running 3 of his existing aircons couple that to the existing running load (refrigerator, lights, sockets, etc) and now his compressor kicks in..

This transient inrush will cause arching to the mcb's contact points..

It doesn't have to happen immediately when the contacts are still new or the spring tension is still good.. This will continue until a weak link in that electrical system fails..

You are an intelligent person.. What would your advice be to this situation?

Borrow from my brother. His company have some project with TNB that uses FLIR. 

So far, everything normal. No sign of wiring overheating even though 4 ac are on simultaneously.

And I use this to check each AC current / load. All good 

I'm not worried about lighting load as 100% LED light use throughout my house. Too little load.

yes i got exactly this lelong unit..   haha

am surprised 1HP aircon doesnt draw much energy if you set temp at 26-27C compared to 20-22C range!

I've been using 4 inverter ac (1x2hp & 3 x 1hp) for the  past 4 years. No issue except have to pay a lot to TNB    Just make sure it's connected from different MCB.

No sign of wiring overheating or what so ever.    (Checked with FLIR thermal camera)

yes i got exactly this lelong unit..   haha

am surprised 1HP aircon doesnt draw much energy if you set temp at 26-27C compared to 20-22C range!

wah...ni next level

thermal camera also come out

but2....26 ~27 macam langsung tak sejuk bang

wah...ni next level

thermal camera also come out

but2....26 ~27 macam langsung tak sejuk bang

oh come on, i was running 2KW  server (4 GPU each server 950W power draw x 2)  thro a 13A extension cord for 2 months 24/7. also use power meter to check.
dont simply scare monger la. use science to count how many Amp per 1HP aircon.. 40amps is alot for 240V, thats nearly 10KW of power.
as long as each 1HP aircon is on one electrical branch it should be ok.
only downside to my extensive server usage was my TNB was over 1.5k per month that two months.. 

Borrow from my brother. Can't afford to buy one. FLIR super expensive. 

Try not to use thick blanket. Just thin blanket will do. 24-25C is nice setting. Also depends on the room. Make sure no gap that cold air can 'escape' 

You install 3phase electric when you need 3phase power equipment not because you need to increase max load of electrical appliances.

Don't simply teach if you donno.

You understand .. but no one knows if he has an inverter unit or a conventional DOL start and that pictures shows  a DB with 24 SP mcb's single phase..

I have never seen a single phase DB with so many mcb's..

Add to the fact they're all non branded components easily means if that RCD is defective any surge inrush current from a DOL motor will fuse any of those mcbs  short circuit and start an electrical fire..

And it's not all soft start.. There's definitely more conventional DOL AC motors out there than inverters..

u mean a DB with 24 SP mcbs is pretty rare ah? is that mean install another aircond sure got no problem? my DB can handle it? 

living hall one is 1.5hp, my room 1hp, another room 1.5hp, plan to get another 2hp aircond, normally 2~3 units at the same time, but if got relatives come, will on 4 units at the same time 

Wow ur electricity bill one mo th how much bro

ok..

3 phase supply properly balanced across each phase means no current flows through the Neutral..  The neutral only returns the unbalance current across the phases..

11KV transmission lines is only 3 wires.. It is distributed in Delta with all phase current balanced.. Only when step down by transformer from Delta 11kV/433V Star is where the neutral is introduced where the Neutral is earthed..

From Transformer it goes to a Feeder pillar where there will be an Earth fault protection device before it gets distributed to residential properties where is must also be earthed at the DB.. This is known as a T-T (Terra-Terra) system..

The usual tail into a residential landed property is only 2x25mm(60A)  or 2x16mm2(40A) Aluminium cable which only provides you the fuse rated max demand load which is a slow blow high rupture capacity fuse..

This maximum demand can easily be exceeded by the high inrush starting current of inductive motors (your aircon motor)..

3 Phase is the name of an electrical supply.. It can be 3 wire (2 phase lines plus Neutral) or 4 wire (3 Phase lines Plus Neutral) supply..

Single Phase is the name of a electricity supply of a 2 wire (one phase plus Neutral) supply..

If in doubt please get a competent electrical contractor to verify the existing maximum demand to check that your wiring can handle the electrical load..

You can easily overload (think electrical fire) your existing wiring if you change your protection fuse to a higher rating without knowing your maximum demand..

What I am saying is basic electrical common knowledge to all electricians..

If you don't understand what I'm saying please talk to an electrical person who knows something about maximum demand and how to use a clamp on ammeter..

Electricity is not your friend .. It is a known killer held in a copper prison just waiting to kill you..

3 Phase is the name of an electrical supply.. It can be 3 wire (2 phase lines plus Neutral) or 4 wire (3 Phase lines Plus Neutral) supply..
I don't think you know your basic electrical common knowledge as well. My fundamental might be flawed cos might gave back some to the Uni but I don't think you're right either.
3 phase can only mean 3 phase. It can only mean 3 phase 3 wire (3 phase without neutral) or 3 phase 4 wire (3 phase with neutral).

I have no arguments with your comments except to clarify my initial statement on 3 phase supply wrt 3ph kWH meters..

The 3Phase kWH meter is always 3Ph4wire

However u don't need to pull in all 4 wires (3 phase voltages and the Neutral) into the residence if  you can satisfy your maximum demand with 3 wires (2 phase Voltages and the Neutral) (as residential use almost exclusively single phase load)..

Saves your money..

here in malaysia

3 Phase is 415V (phase voltage) as opposed to Single phase is 240V(line voltage)..

It's only the name of the supply voltage (415V phase-phase)..

I hope thats clear and you're welcome to comment further..

so..
is it much safer and money saving to use 3phase instead of single phase?