Is Romex 8/2 Considered A Three Wire System? - Electrical - DIY Chatroom Home Improvement Forum

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Old 10-17-2010, 09:11 AM   #1
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Is Romex 8/2 considered a three wire system?

I'm putting in granite countertops and thinking about replacing a 12 yr old Kenmore electrical Downdraft cooktop with a Jenn-Air 8230 . The instructions for the Jenn Air say" A three wire single phase AC 120/240 volt 60 cycle electrical system (properly circuit protected to meet Local Codes of NFPA No. 70) must be provided. Unit must be properly grounded IAW local wiring code." We are outside of city limits, so this house was not built under any code requirements. The current Kenmore installation has the Romex running right into the electrical box of the cooktop, and the screws are stripped so I can't open it up to look inside without tearing up the control panel. The outside of the Romex say GCC 8/2 with ground type NM-B 600 Volts. Is this considered a three wire system? Does this supply adequate protection? The electrical requirements of the Jenn Air are 40 amps, 60 hz 240 V. The circuit breakers are 40 amps. Is there a better way to hook the new one up than running the Romex into the box? This cooktop is in an island, with a slab foundation, so running new wire would be beyond our capability if that is what is needed to be safe. Is what we have OK, or is there ways to make it safer?
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Old 10-17-2010, 09:17 AM   #2
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Your current cable is a 2 wire + ground. It was a setup for a straight 240 volt appliance. It might have also been an incorrect installation.

Since your cooktop says 120/240 you should have 2 insulated hots, an insulated neutral, and a ground. It would be labeled 8-3 w grd.
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 10-17-2010, 06:53 PM   #3
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You may not make it work using the 8-2 Romex. Since you don't want to string an 8-3 cable, you will have to abandon the project.

An electrician hired to install the Jenn Aire for you would consider running a conduit (looks like a pipe) up fron the island to the ceiling and string the cable through the ceiling. You could then get a decorative wood molding to cover the conduit.
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Last edited by AllanJ; 10-17-2010 at 06:59 PM.
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Old 10-17-2010, 07:23 PM   #4
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The 8/2 cable was most certainly not buried directly in the slab. It should be in a conduit. If that is the case you should be able to pull in the correct cable.
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