I need to know what to wire together when installing a new oven for my mom. I have 3 wires coming from the house, white, black, and bare. Coming from oven, red, black, white with attached bare. What do I put together?

Thanks for your help

re: oven wiring	Warren Goodrich	8:46 pm tuesday september 18, 2001

You said that you have an existing branch circuit supplying that wall mounted oven with a black, white, and a bare conductor. This branch circuit can not be used to connect that oven. While the NEC does allow a three wire branch circuit to serve an oven. There are limitations that must be met first considering that existing branch circuit.

First the conductors must be sized a minimum of 10 awg. Most likely your oven branch circuit does have conductors meeting that size minimum to be used as existing.

Second that cable must be an Service Entrance cable beint a black, red, and a bare that is webbed around the two hot conductors. You said you have a black, white, and bare. No Service entrance conductor that is on the market has that combination of colors in its sheath. You must have what is called nonmetallic sheathed cable [Romex]. Romex is not allowed to be used to serve and oven unless that Romex contains a black, RED, white and bare being four conductors. You must install a new branch circuit. I suspect you will need to run an 6 or 8 awg sized four wire Romex to replace that existing branch circuit that is not allowed to be used as you discribed it. You must run a new circuit with a black, red, white and bare conductor in that Romex cable. Size would depend on the name plate rating of that oven. I would say the minimum size is an 8 awg as per table 220- 19 in the NEC. Most people run a 6 awg four wire Romex cable. The black and red wire connects to the 40 amp breaker for 8awg or 50 amp breaker for 6 awg Romex. The white and bare wire connects to the neutral bar of the panel.

At the oven the colors are connected matching the colors of the oven using Blue wire nuts.

Hope this helps

Wg

re: oven wiring	Warren Goodrich	8:54 pm tuesday september 18, 2001

Sorry I forgot to give you the NEC rule reference number. The rule requiring you to replace that existing branch circuit serving that oven is 250-140 and 250-140-D.

Sorry for the bad news but better to be safe than sorry.

Wg