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Posted By Topic: Oven replacement

Dec 11 2018 08:14

Looking to replace my built in oven. Current oven is rated 3.2kw and is on it's own separate circuit with a 20amp circuit breaker on the fuseboard. The oven is plugged into it's own dedicated socket in the cavity with a standard 3 pin plug. The only other appliance plugged in to this cicuit is the ignition for the gas hob.
Oven we are looking to fit is 3.4kw, and has no plug so intended to be hardwired. Question is, is it ok to attach a plug to this new oven and use the existing socket being as it's rated high enough and has no other high current appliance on this circuit? It should be noted that this circuit also has a separate switch in the pantry to turn it on/off.

Dec 11 2018 08:58

If by "standard 3-pin plug" you mean a 10A plug, then existing 3.2 kW oven is electrically unsafe and whoever set it up like that should be shot.

But OK if it's a 15 A rated plug (and socket) - they look very similar but the 15 A one has an earth pin larger than the other 2 pins.
(Assuming the circuit cable has an installed CCC of at least 20 A)

Either way, the new one can be fitted with a 15 A plug; and if necessary the socket upgraded to 15 A. Or it can be directly connected instead. The advantage of using plug connection is basically ease of servicing; can be unplugged to provide isolation and to make working on it easier.

The control switch in the pantry is not a requirement for an oven. Nor for a gas hob.
But if the switch were needed - eg for an electric hob - then putting it in the pantry would be non-compliant.

Dec 11 2018 09:06

thanks - the current smeg oven has the original factory plug and cable so would definitely be rated to 15amps.
The circuit for the oven is 20amp, I will just need to check that the socket itself is 15amp, is that stamped onto the plastic somewhere?
Obviously I am going to get my sparky to check all this, just want to make sure buying the oven isn't going to require extensive rewiring, which it certainly sounds like it isn't the case.

Dec 11 2018 09:42

"original factory plug and cable so would definitely be rated to 15amps."

may, but not necessarily.
Sometimes under-sized plugs & flexes are fitted for demo purposes.

Circuit is protected at 20 A. But should get your electrician to check that the cable has suitable rating. Probably has, but always pays to check that the previous "sparky" didn't take any short cuts.
If you unplug the existing, check the p[lug - should have a wider earth pin, and should also be marked as 15 A.
The socket may not be marked, but if 15 A will have a wider slot for the earth pin (the one on a radial line).

The configuration allows lower rated plugs to be used with higher-rated sockets, but not vice versa.

Dec 11 2018 09:45

Great thanks, what thickness cable should it be? 4.0mm?