Hi, I need help on some electrical thingy. Cause I heard different versions from different contractor.

Previously, I informed my wiring men that I would like to install hood and electrical hob so a double pole switch is required and will shared among hood and hob.

After consideration, I would like to go with gas cooker and install a built in oven instead. Can my built in oven share the same double pole wiring with my hood?

Or, can the electrical hob wiring suppose to connect to my built in oven?

usually, oven will b an independent wire. so u can use the hob wire for oven since u r using gas now

as for hood, u can loop from other places, not recommended to loop/share with oven

This post has been edited by zheilwane: Oct 9 2019, 08:18 PM

I would have different opinion.
Hood power rating is not much.
It can share the wiring with oven or hob.
Definitely no wire sharing among electric hob and oven... at least they cannot turn on together.

yup can share as a normal 2.5mm wire can take 4500 to 4800 watt

oven is 3000watt +-
hood 250watt +-

so definitely can take the load but usually contractors wont loop with oven but loop or share with other appliances like socket plug

Hi,

Just an estimate on power consumption...
Hood maybe max 200 watt since it consist of fan and LED light.
Build in oven is about 2800 Watt
Theoretically hood and oven can share the same MCB.

BUT electrical safety wise... it's best to have dedicated circuits for heavy duty appliances e.g. oven, electrical hob .... https://www.thespruce.com/dedicated-circuits-1152239 (American Guidelines)
Dedicated means only one heavy duty appliance to a MCB (circuit).

Suruhanjaya tenaga (Malaysian Guidelines) https://www.st.gov.my/contents/publications...uildings%20.pdf
'Electric cookers exceeding 3kW shall have its own circuit connected permanently to a 30A rated circuit breaker or fuse with an isolator switch and cooker control unit incorporated with a 13A socket outlet. Two or more cooker appliances may be installed in the same room within a distance of 2 meters.'

My hood is actually shared with 2 LED light and 1 exhaust fan (10A MCB).
Initially I had suggested to the electrician for it to be shared with 2X13A power point (20A MCB). I suppose either way is fine...

My opinion...
Assuming you are no longer using electrical hob (using gas instead), your previously planned electrical hob wiring (dedicated MCB) can be used for your oven.
Pull wire either from another power point nearby or lighting point nearby for your hood.

It's still in keeping with Suruhanjaya Tenaga guidelines if you do decide to share your oven(less than 3kW) and hood in one circuit (MCB) tho.

Guys, sorry to necro this thread, i need help
My contractor share one 32c mcb with 1hp ac, kitchen lighting,kitchen plugs, fridge and washing machine. Will it overload? Will it post issue?

I notice kitchen plugs.
What do you plan to hook up to those plugs?
Kettle/rice cooker/juicer/toaster/food processor/microwave/etc?
And how many active at one time.
Usually the plugs for appliances would run a dedicated line.
Do you plan to use dryer with the washer?

Overload….Depends on the type and number of kitchen equipment you are plugging into the kitchen plugs…

It’s better to have dedicated line for heavy duty appliances. But some older houses with single phase wiring… 1MCB covers the whole kitchen…

If it’s a 32A MCB, make sure your wire quality is good. I requested for a 4mm wire (4mm for live and neutral and 2.5mm earth). My electrician mentioned that if it is a good quality wire, 2.5mm is sufficient.

Let’s see… 32A… ‘For a margin of safety, it’s best if the normal load on a circuit does not exceed 80% of the maximum (rated) load.’ That leaves us with 25.6A.

Assuming its 240V…. W/V= A
Kitchen Lighting 80W 0.3A
Fridge 400- 800W 1.7- 3.3A
1hp AC 800W 3.3A
Washing Machine (no dryer)500W 2.1A
Total= 7.4- 9A
25.6A-9A= 16.6A left…

How many kitchen plugs do you have?
Kitchen Plugs (Wattage may vary, based on my kitchen appliances)
Microwave 1000-1150W 4.8A
Mini Toaster Oven 800W 3.3A
Kettle 1850-2200W 9.2A
Portable Induction 2000W 8.3A
Stand Mixer 1500W 6.3A
Rice cooker 400W 1.7A
Slow cooker 250W 1.1A
Blender 900W 3.8A
32L Countertop Oven 1800W 7.5A

Just do the sum…. For total Amperage of the kitchen equipment
You can use
Blender, slow cooker, rice cooker and kettle simultaneously OR
Countertop oven and portable induction simultaneously….

Plus you won’t be using everything simultaneously…. Washing machine will only be on 1-2 hours a day, kettle 5mins each time… And your equipment setting might not be on max setting e.g countertop oven 250C max temperature max wattage.

Thankx Guys for detailed feedback, Much appreciated !

So far I just clarified with the Electrician, he mention is not his fault, he did not touch the Kitchen or the AC MCB wiring, is the developer original setup. so he cant do much. he just advice me not to use all the heavy appliances all at once. He even say that newer condo uses a smaller DB box. Not sure what he said is true. Ill look for the condo management to confirm the case.

I guess like you said, not to use everything simultaneously, might be rare if i were to use all the appliances all at once.

Thankx again guys!

2.5mm only can take max load 21A for good quality cable like mega kabel.
See the 3-cable spec because LNE also need 3 cables, it is derated a bit from 2-cable LN because the conduit space and heat factor also taken into consideration.

This is already specified in their datasheet.
 A_1.pdf ( 2.24mb ) Number of downloads: 36


This post has been edited by ceo684: Oct 20 2020, 01:03 PM

I guess the wiring came with the house and you are not doing any re-wiring.
Else, the wiring contractor would usually recommend running new lines. Quite easy job especially for a condo and good money for them.
I set up 2 Eubiq rails and the contractor ran a 32A for each and the hood taps from one of it.
Microwave is connected to the other one. Oven has it's own.
I'm grateful for that arrangement now.
I can cook rice, boil water, pre heat oven, run the food processor, hood and microwave all at the same time.
If your washer is a combo, you need to pay attention to the heater current draw if the line is shared with you kitchen appliances.
Sometimes, it can be easy to forget.