Can You Install a new induction cooktop to an existing hard wired wall oven on the same circuit? the oven is 3000W & cooktop says 7400w to me this looks like a 40 amp or more power draw combined. And the fuse box for the range says 30A. My old cooktop used to be gas so 30A was all good for the oven.
wind.turbine,
Apr 28, 10:30pm
I guess it will depend on what your wiring is rated to handle
doyafeellucky,
Apr 28, 10:56pm
6mm² when I looked at the oven. Does anyone have any advice? Thanks
boby11,
Apr 28, 11:12pm
You will have to get an electrician in to fix up wiring etc
ira78,
Apr 28, 11:23pm
Yeah, that sounds it might even need a 50 amp fuse. It will probably say somewhere in the manual or specs.
But, you'll need an electrician in to upgrade the wiring. At the very least you'll be constantly popping the breaker.
doyafeellucky,
Apr 29, 12:55am
thanks Ira78. Thought so too, yeah always intended that a sparky would do this job - was just curious.
tygertung,
Apr 29, 2:52am
Usually only 62 amp for whole house, but circuit breakers are usually 32 amp not 30 amp.
tegretol,
Apr 29, 2:52am
Plug it in and see. If the CB keeps popping then you have your answer. The CB will be sized to protect the cable so you can't do any harm and the reality is that you won't be drawing the whole 7kW at the same time.
vivac,
May 1, 4:15am
On the box will say 7200W, in the specification it will say what size power feed it needs, usually 32A for something like that, as they are now smart enough to cycle elements to keep current drawn down. An oven is usually around 15A feed, so its not likely you will be able to use both appliances on the one 32A feed without tripping the supply out under heavy use, you may find its fine to run two elements and the oven, but three elements and the oven will trip. Its better to be on its own supply from the switchboard though.
apollo11,
May 1, 5:14am
Our electrician recommended 6mm cable for an induction top and a second 2.5mm cable for electric oven.
tygertung,
May 1, 6:23am
Say for example you are drawing the full 50 amps for your range, then you have the hot water cylinder going, and a couple of heaters, would the main house fuse trip?
johotech,
May 1, 6:29am
They can both be connected to that cable. And your electrician should change the fuse for a 32A circuit breaker. Guaranteed you will never have any problem with it, and it's perfectly acceptable under the wiring rules. But feel free to pay more and have a new separate circuit installed for the oven if you want to. But it's totally unnecessary. A 32A circuit is fine for up to 13,000W of cooking appliances with diversity applied.
sandymrph,
May 1, 6:32am
None of you have answered the exact question. "Can You Install a new induction cooktop to an existing hard wired wall oven on the same circuit? the oven is 3000W & cooktop says 7400w to me this looks like a 40 amp or more power draw combined." . The answer being: is YES YOU CAN install a new induction cooktop to an existing hard wired wall oven ! (and a lot of people do so - but it isn't a "good" option. ) As Vivac warns - you can't ever use/draw full boogy,. and I certainly wouldn't do such a thing even if the wiring is brand new in the place . Best way is to run another dedicated line, (at a pinch - if your really desperate - wire up the induction cooktop to your oven circuit after disconnecting the oven from that circuit. Buy a new oven and "plug" it into one of your existing 'HEAT" circuits. Edit - Oh sorry - I was writing all that as Jhonno replied. He is right too. (excepting the I Gaurantee part). but it honestly does depend on the situation - there is one hell of alot of oldly (and oddly) wired up houses in NZ.
fast4motion,
May 1, 7:13am
While it might be safe to connect it to the existing cable (the 30A breaker will trip to protect the cabling), I'm sure there's a regulation that prevents an electrician from performing an installation which is likely to result in a breaker tripping, even if it is "safe".
So an electrician should check the cable diameter/length/installation to determine the largest rated breaker they can fit. And if you currently have a fuse, the base will probably also need to be replaced rather than using a plug in breaker, because they typically don't fit into the larger 30A fuse holder bases. Then check the cooktop specs as per #9 to see if it'll work or an extra cable needs to be run.
pheonix,
May 1, 6:03pm
This is exactly what was done at my place. Old stove disconnected, induction hob and separate oven wired from Oven isolation/off-on switch on the wall. Has been operating for the last 2 years and breaker has never operated. Just for your info, the wife reckons she will never ever go back to anything else after using the Induction hob. Heat control is quick and dont get the burning marks from gas. Pots still look like new.
tegretol,
May 2, 3:53am
You must be a sparky looking for work! Think about it from the OP's point of view!
doyafeellucky,
May 20, 7:45pm
Thanks for the input everyone, just for anyone out there researching this interesting topic and want clarification. Many of the above statements are true, You need a new 6mm² cable with an isolation switch at the socket. I bought a 32A hardwired cable with plug attached (for the new hobb) and that came with a 32A socket. a 12m run to the box with a new 32A breaker was installed by the electrician. Cost was $645 + GST and they were there for approx 7 hours.Done and the Hobb is working great, wife is extremely happy after 10 years with a broken gas top!
easyglowcandle,
May 22, 1:54am
Not necessarily a Sparky looking for work, there is a difference between doing what might work and doing it the right way, the right way is what the OP ended up with even though they could have gone the other way and perhaps had no problems they also could have ended up getting the job done twice.
kitkat66,
Jun 3, 7:40pm
Have any of you even read an Electrical Regs book, apart from jonotech ? Look up "diversity factor".
Also check out induction hob cyclic load function.
wembley1,
Jun 3, 10:32pm
I've just had a look at the Electricity (Safety) Regulations 2010 and the phrase "diversity factor" doesn't appear.
Ohh you mean the Wiring Rules.
stylus1,
Jun 4, 3:02am
in the end , it's all about the insurance, if they can find an out, they will, so it's best to stick to the regs. A factor in wiring is length of run and making sure there are no wall batts covering the wire. Also install the smallest rated circuit breaker that will stand the load.
bill1451,
Jul 21, 5:11am
Actually your last sentence is incorrect, you size the the MCB to the size and current rating of the cable, taking into account length of run, The MCB,s main function is to protect the cable and to a lesser extent the appliance connected to it, but still protect the appliance in cases of a dead short in the appliance wiring, but big enough to prevent nuisance tripping, its all about sizing the MCB to suit the cable.
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