OVEN AND COMBI MICROWAVE WIRING

[saishah]

Hi All,

Currently rewiring my house. I am installing a new oven - 3.65kW and combi microwave - 3.6kW protected by a 16A mcb.

Would a 2.5mm for each appliance from the cu to a 20A DP switch surffice over a 20m run?

Thanks

 

[Taylortwocities]

16A looks a bit tight to me. What is the size of the cable from the CU to the DP switch?

 

[buzzlightyear]

Currently rewiring my house. I am installing a new oven - 3.65kW and combi microwave - 3.6kW protected by a 16A mcb.

Would a 2.5mm for each appliance from the cu to a 20A DP switch surffice over a 20m run?

Is this circuit been calculated. Plus new circuit local building control needs notification.

 

[telectrix]

Hi All,

Currently rewiring my house. I am installing a new oven - 3.65kW and combi microwave - 3.6kW protected by a 16A mcb.

Would a 2.5mm for each appliance from the cu to a 20A DP switch surffice over a 20m run?

Thanks

put it on a 32A with 6.0mm cable. that will also future proof it if ever you eant a bigger appliance.

 

[saishah]

16A looks a bit tight to me. What is the size of the cable from the CU to the DP switch?

thiking 2.5 from cu to dp. 16A is in the manufacture instructions 2.5mm should be sufficient enough just want to make sure!
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put it on a 32A with 6.0mm cable. that will also future proof it if ever you eant a bigger appliance.

was thinking this however most new ovens have a max load of 3.6kW so should be alright to keep it as 2.5mm, 6mm would be overkill, just need someone elses opition.

 

[James]

Have you done any calculations?
Or are you looking for a simple yeah, that should be ok.

 

[Taylortwocities]

thiking 2.5 from cu to dp. 16A is in the manufacture instructions 2.5mm should be sufficient enough just want to make sure!
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was thinking this however most new ovens have a max load of 3.6kW so should be alright to keep it as 2.5mm, 6mm would be overkill, just need someone elses opition.

That 16A / 2.5mm is for just one oven/microwave!!!
You want two on the same circuit.
You either need two separate 16A circuits or, as above a 6 or 4mm circuit with 32A MCB.

 

[saishah]

Have you done any calculations?
Or are you looking for a simple yeah, that should be ok.

I have done the calcs - 16A breaker is acceptacble and thats what the manufacture says.

2.5mm cable is capable for the load too but just want to make sure as I have never run a 2.5mm for oven or combi. I guess with these new appliances they are trying to make them more efficent etc..

I have an existing 6mm installed so will utilise that for one of the runs but for the new one want to make sure 2.5mm will be fine. I am not bothered about futureproofing as it is my own house and is the most up to date model of appliance.
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That 16A / 2.5mm is for just one oven/microwave!!!
You want two on the same circuit.
You either need two separate 16A circuits or, as above a 6 or 4mm circuit with 32A MCB.

i will be running 2 seperate circuits for each appliance

 

[Taylortwocities]

Ah. That’s clearer.
So, new 16A circuit. RCD protected?
What will you do about notification to LABC?

but, you already Have the 6mm circuit. you can run both appliances from that, no new circuit needed!

 

[saishah]

Ah. That’s clearer.
So, new 16A circuit. RCD protected?
What will you do about notification to LABC?

but, you already Have the 6mm circuit. you can run both appliances from that, no new circuit needed!

i could run them both off 6mm but want to have them on separate circuits and isolate them individually from the grid switch/CU. And nothing as its my own house.

 

[Taylortwocities]

And nothing as its my own house.

That doesn't matter. New circuits have to be notified.
If you are doing it yourself, you'll need to raise a building notice BEFORE WORK STARTS and pay the LABC fee. And be prepared to certify the new circuit using all that calibrated test equipment you have to hand.

But maybe i'm wasting my time advising you the correct way to do things?

 

[westward10]

You claim to be a practicing electrician who is rewiring their house so asking these fundamental questions is somewhat of a concern

 

[buzzlightyear]

could run them both off 6mm but want to have them on separate circuits and isolate them individually from the grid switch/CU. And nothing as its my own house.

It does not matter if its a Wendy house this part p melarky has been in since 2005 so
All new circuits need reg to the local building control.

 

[telectrix]

use the existing 6.0mm to a 45A cooker switch, then split off with 2 x 2.5mm radials, each on a 20A D/P switch.