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A cooker hood needs to done by a competent qualified Electrician but basically depending on your surface of the cooker hood.Depending on the type of cooker hood you have(extract or outside) If it is a extraction (meaning you are using filters and not connected to a vent) The Electrician needs to connect the electric to a point or spur via a power switch on the wall which when you fit up the main part of the hub covers the spur. after that you need to measure and fit the cooker hood to your requirements but make sure your walls can support it and mark off the holes before drilling or check the walls for electric wires in terms of safety.
to connect the wires to the connection spot is fairly simple. th connection point on the cooker either has seperate bolts for the wires or screws. if screws are present then you have to buy from the nearest electrical supply store or home depot or lowes or some hardware stores what is called a "terminal". you have to get the terminal for the size wire you have which is probably 14 gauge or 12 gauge if 120v(regular outlet) or 10 gauge for 30amp wire at 240v. the 30amp wire is 10 gauge and is easily bought at any of the stores listed. it depends on what outlet it is being plugged into. if the outlet it's being plugged in is like that a lamp could be plugged in then it is 15 amp and 14 gauge. since it's a cooker and probably in the kitchen then you will be safer with 12 gauge for 20amp. they plug in the same outlet. both are 120v.
as i wrote before, the terminal or in the case of a bolt, a lug; the end of the wire must be stripped. this is done w/a elctrical wire stripper, again bought at any of the stores i mentioned above. in the case of a terminal, you must also squeeze the end where the wire goes in because it has to be crimped as to not allow the wire to come back out. this os done w/a crimper, usually on the othe end of the wire stripper you buy. if it is a bolt on the inside of the cooker splice box then you buy the lug and you strip the wire and the wire is held on to the lug by a screw. the hole on the other end of the lug goes on the bolt and is held on by a nut. all this info is given by an electrician w 35 yrs experience.
Hi .. you should check the breaker supplyingh the power vto this cooker. If you find a two pole breaker , then that white wire is power , not a neutral. In this case just treat the two wires you have as both hot and connect each to a wire on the cooker.
The cooker must be connected to the correct electrical supply as stated on the voltage label on the cooker (This is obvious so far!). It should be connected through a suitable cooker control unit incorporating a double pole switch having a contact separation of at least 3mm in all poles (This means one of those big red switches with "COOKER" written on them). The cooker must NOT be connected to an ordinary domestic power point. The cable size used should be between 6mm squared and 10mm squared twin and earth. Where the installation is protected by a 30 milliamp sensitivity residual current device (RCD Breaker), the combined use of your cooker and other domestic appliances may occasionally cause nuisance tripping. In these instances, the cooker circuit may need to be protected by fitting a 100 milliamp device. This work should be carried out by a qualified electrician.