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allyshake

3 posts

Wannabe Geek


#319002 12-Mar-2025 13:23
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I am purchasing the following two appliances in New Zealand:

 

 

 

Bosch Series 8 Built-In Compact Oven with Microwave Function CMG778NB1 Connected Load 3.6 kW Spec says 16A breaker required

 

 

 

https://assetscdn.loadbee.com/catalogue/stdzsexzpn4nf9e3/Documents/specsheet/en-NZ/CMG778NB1.pdf

 

 

 

 

Series 8 - induction cooktop - 60 cm - Black PXY675DC1E Connected Load 7.4 kW Spec docent say what breaker size needed

 

 

 

https://assetscdn.loadbee.com/catalogue/stdzsexzpn4nf9e3/Documents/specsheet/en-NZ/PXY675DC1E.pdf

 

 

 

 

I have one breaker and circuit available on my switchboard for connection. It is currently a 32A MCB Single Phase which was used for the old free standing oven. Not sure if its 4mm or 6mm sq TPS.

 

 

 

Can both these appliances be on the ONE circuit?

 

 

 

If they are on the one circuit what wire gauge will I need to run. The cable run will be less than 10m in total for the run from board to outlet.

 

 

 

What breaker will I need. Im planning on using an RCBO rather than just an MCB if that is OK.

 

 

 

Whilst there is no insulation in the walls Im planning to add it and there is insulation in the roof. So assume Enclosed in insulation for the sake of specifying switchgear.

 

 

 

Is it normal for these to be on a fixed connection or will they need to have an isolation switch at the wall? (There is one currently but it has a very old style plug connection which is probably original when the house was built circa 1962.

 

 

 

Thanks

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gregmcc
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  #3353224 12-Mar-2025 14:38
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allyshake:

 

I am purchasing the following two appliances in New Zealand:

 

  Bosch Series 8 Built-In Compact Oven with Microwave Function CMG778NB1 Connected Load 3.6 kW Spec says 16A breaker required   https://assetscdn.loadbee.com/catalogue/stdzsexzpn4nf9e3/Documents/specsheet/en-NZ/CMG778NB1.pdf   Series 8 - induction cooktop - 60 cm - Black PXY675DC1E Connected Load 7.4 kW Spec docent say what breaker size needed   https://assetscdn.loadbee.com/catalogue/stdzsexzpn4nf9e3/Documents/specsheet/en-NZ/PXY675DC1E.pdf   I have one breaker and circuit available on my switchboard for connection. It is currently a 32A MCB Single Phase which was used for the old free standing oven. Not sure if its 4mm or 6mm sq TPS.   Can both these appliances be on the ONE circuit?   If they are on the one circuit what wire gauge will I need to run. The cable run will be less than 10m in total for the run from board to outlet.   What breaker will I need. Im planning on using an RCBO rather than just an MCB if that is OK.   Whilst there is no insulation in the walls Im planning to add it and there is insulation in the roof. So assume Enclosed in insulation for the sake of specifying switchgear.   Is it normal for these to be on a fixed connection or will they need to have an isolation switch at the wall? (There is one currently but it has a very old style plug connection which is probably original when the house was built circa 1962.   Thanks

 

 

 

Cable sizing, volt drop, derating factors are all things your electrician should take care of, for the average homeowner this is beyond what they are likely to know.

 

A fixed oven/cook top does not need a plug/socket arrangement.

 

No need for a RCBO as not required for a fixed appliance.

 

You can run both off the same circuit, ideally separate switches, again dependent on the actual wire size.

 

As far as the spec's on the cooktop, things don't add up, 4 zones at 3.7kw does not = the claimed connected load of 7.4kw, but keep in mind there is a diversity factor allowed for in AS/NZS3000.

 

The circuit breaker is there to protect the wiring, not the appliance on the end of it.

 

Get your electrician to do all this for you, that's why they spend 4 years learning the trade.

 

 

 

 


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