Bought a new whirlpool ceran cooktop it only has 3 wires black, red, green but the old cooktop had 4 black, red, white and green can I hook up to old wires and just not hook up the white

The white one may just form an earth loop,, I recently had a ceramic plate needing cleaned so we did the whole lot, I think most hobs have 4 wires and they are numbered rather than colour coded..hope this helps

Hello,

I suspect on teh wiring from the house the black&white will be the hot wires and the bare will be ground/neutral

use a volt meter before connecting tonew cooktop and check for;
black/bare to have 120volts
white/bare to have 120volts

if that is what you find...connect new cooktop as such;

black to black
red to (house) white

(cooktop) white and green to bare


GENE

No you do not. You have a 220 system. What you do to hook it up is. In the box in the wall you should have 3 wires. 2 black and one white. Then on the cooktop you have the 3 wires 1 black, 1 red, and 1 white. You take the black from the cooktop to the black in the wall box. Take the red to the other black in the wall box. then take the whites and put them together. Now if you have a green or bare wire that is the ground. Just hook that to the wall box.

If you have any questions please ask.

Green goes to white.

black to black
red to red
white to white
green to copper

Old plug: green is ground, white and blace are both hot power. New cooktop: green is ground, WHITE is COMMON, black and RED are hot power. You are going to need an electrician to run a new circuit and plug for your new cooktop.

Attach it to white or any ground screw.

To complying with changed Codes (effective in 2002 ) regarding stoves, ovens and dryers. You will need a 120/240 volt 4 wire 40 amp and 50 amp circuit. This
Decades ago it was permitted to use a 3 wire system (having two 120 volt hots (Black and Red) and 1 combination ground/neutral wire) (green and white) to serve stoves, cooktops, ovens and dryers.
The Code change now requires all stoves and dryers in NEW construction to have the 4 wire set-up (now having two 120 volt hots, 1 white neutral and one green or bare wire ground).
Existing wiring is grand-fathered under the Code change.....I advise you to change the feed wiring over to the the 4 wire set-up...
because - as with ALL Code changes in the past...it will eventually become mandatory for all stoves, ovens and dryers as the grand-father clause drops off. By complying now...
BUT the wiring will need to change to 8/3 with ground. (having 4 wires inside one outer jacket).This is the primary reason for the Code change....to provide a greater margin of safety to the user.
I can NOT recommend the 3 wire hook-up...the 4 wire provides a seperate ground and neutral -
which makes the chance of a user shock when touching the metal frame (from an internal fault in the oven) much less likely then the old 3 wire set-up....
which did NOT have the seperate ground and neutral.
Krazytech

SOMETHING DOENST SOUND RIGHT ABOUT THAT AT ALL. i would contact an electrician, would not even want to venture a guess as to whats goin on . let alone advise to hook up a ground to a nuteral and cap the nuetral.theres somehtin up there . i would call in a pro on that one

On Cooktop From Box
| |
Black to Black
Red to Black w/red stripe
White to Ground
Green to Cooktop frame