2.5mm cable current carrying capacity is 21A
Assuming TNB supply is 230V

2000W kettle 8.69A
1000W Rice cooker 4.34A
2200W 60L oven 9.56A
3600W water heater 15.65A
1800W blender 7.82A

Haven't add electric cooker hob (not the blow wind hood) into calculation
Sounds like faiya waiting to happen unless the cabling is based on 4mm (32A capacity) or 6mm (41A capacity) backbone which I really doubt..if all 5 points and the WH is on it should trip the MCB. If its as per what you described the contractor just made a 5-way power strip out of the original one socket and default wiring spec from developer is based on 2.5mm it is not enough for 5 sockets on the same backbone to DB box.

Personally I run 4mm direct to DB for kitchen outlets (twin sockets aka 2x 13A) for each 4mm backbone so I don't need to worry about wiring getting warm when I have lots of appliance loads.

ST guideline for WH is that it must be on own dedicated circuit with 10mA RCD.

This post has been edited by ceo684: Jul 27 2020, 02:19 AM

My condo reno was almost done but I have just found out that all three-point plugs were looped from the existing plug points.
This is OK. Its allowed to loop.

They also looped the power point for the fridge to four other power points in kitchen, meant for microwave oven, kettle, rice cooker, blender.
This is OK in theory but its silly because the 20A MCB will keep tripping on overload.
Hence for heavy load appliance use 4mm direct LNE to a double socket.

The original power point for the fridge is 20Amp, 2.5mm cable. The contractor suggested to swap the MCB from 20Amp to 32Amp to solve the issue.
This is not silly, this is ILLEGAL and BODO suggestion from unqualified electrician

Is this workable? Will this pose electronical hazard or damage to the electrical appliances? Or shall I insist on pulling new wiring direct from DB? There will be some hacking and plaster ceiling work from DB to kitchen around 4m distance.
Safety belt rubs on your neck and is painful? Let me cut your safety belt with scissors and we go for a drive. That's what's making the C20-C32 change of MCB will do
Pull from DB lah only 4m omg. The wires loose cut only cost a starbucks drink even for 4mm. Find a better electrician not this kind of kiamsiap dangerous BODO that don't understand current carrying capacity and putting people's safety at risk.

Loose cut = buying what we need (short lengths) not the whole roll (if we dont want to keep stock for a 100m roll)

At the beginning I did tell the sales agent that all the three-point plugs especially to the kitchen must be new wiring pulled directly from the DB.
Did you get it in writing? with a full set of LNE dedicated line and a dedicated MCB to be added inside DB box. DB box may (most likely) need to be upgraded with a bigger box to accomodate additional MCBs.

This post has been edited by ceo684: Aug 26 2022, 01:08 PM

The way of refusing to do is another gangsta tactic liao. Sad to say. By doing so they are completely washing hand "not my house syndrome".
If you report - they know where you stay and who you are liao. I know yes, the right way is report, but these buggers can be ruthless one.

The haunt for proper wireman/chargeman is in https://www.facebook.com/groups/wireman/ - insist on at least a PW1/2 for single phase or PW3/4 for three phase.

Parts are not expensive but working in the DB box is extremely dangerous if you are not trained.
I think stormer.lyn doesn't do commercial jobs (Correct me if im wrong) but I know bobowyc does commercial, you can check with them.

I relocated to SG so can't accept job atm.