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You have an hob with European three phase at 220volt mains wire connected.
You need to to disconnect from mains connection box on hob and fit conventional British brown, blue and green/yellow.
Inside the connection box you will see three live terminals,(L1,L2 & L3) there are usually some brass links to join them all up and then attach brown core to one of them. If the links are not there then you will need to fit 2.5mm links from a piece of wire.
The US National Electrical Code only mandates white (or grey) for the neutral power conductor and bare copper, green, or green with yellow stripes for the protective ground. Power will generally be black or red. 3 phase power will have three colored lines, the first is generally black or brown, the second red or orange, and the third blue or yellow.. i,e, Yellow/Green is Earth so 'E'. Brown is live so 'L', and Blue is neutral so 'N'.
green or green and yellow is the ground (earth), blue is neutral, black and brown are both lives. this is the standard european wire color code since 2004. If it is older than that, black was used as a neutral, and blue as a live. very confusing.
If there are no other connection ports, and you only disconnected the three, it is possible that (if this is an aftermarket wiring harness) the third was put in for similar units with an additional option of some sort, and is not needed for your model. However, I highly suggest referring back to the place of purchase, as well as the manufacturer to find out for sure before plugging the unit in and using it.
Please let me know if you need further assistance,
Guru, Premium Expert, Phone Support (Chat) @ Fixya.com
Unless your cooker is totally different to the norm, then yes you can use 3 core cable. assuming you are in the u/k, then the following applys.Brown is live-Blue is neutral, andGreen/Yellow is earth.
Depending on the total wattage of the cooker, you will need to use a min of 6mm twin and earth cable, If in any doubt, consult an electrician
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