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A usual case (though this may not be your case) for an oven or cooker is a loose connection overheating and causing a partial or complete disconnection.
The location of this overheated connection is normally obvious as the accessory also starts to melt or discolour.
The normal run of cable would be from MCB to cooker isolator switch (on kitchen wall or in kitchen cupboard) to cooker outlet point (behind cooker) to flex or twin and earth to cooker.
It is possible that your cooker is supplied form a socket circuit (which it should not be) if there was only a single oven there before.
The different colours of cables could be because the cooker circuit from MCB to switch was not changed but the part after the cooker isolator was changed.
Correct identification of the circuit involved and safe isolation of the circuit are critical to safety.
It is generally best to test the resistances of a circuit whilst it is totally disconnected from the power supply and not to attempt to monitor voltages on a live circuit. Professional assistance should help in this regard.
A logical approach is also useful and just changing items, whilst it may cure a problem, means the reason for the problem is not known and can cause a repetition later.
Being alive is more important than a non working oven, so ensure safety at all times.
The location of this overheated connection is normally obvious as the accessory also starts to melt or discolour.
The normal run of cable would be from MCB to cooker isolator switch (on kitchen wall or in kitchen cupboard) to cooker outlet point (behind cooker) to flex or twin and earth to cooker.
It is possible that your cooker is supplied form a socket circuit (which it should not be) if there was only a single oven there before.
The different colours of cables could be because the cooker circuit from MCB to switch was not changed but the part after the cooker isolator was changed.
Correct identification of the circuit involved and safe isolation of the circuit are critical to safety.
It is generally best to test the resistances of a circuit whilst it is totally disconnected from the power supply and not to attempt to monitor voltages on a live circuit. Professional assistance should help in this regard.
A logical approach is also useful and just changing items, whilst it may cure a problem, means the reason for the problem is not known and can cause a repetition later.
Being alive is more important than a non working oven, so ensure safety at all times.