Identifying Hot/Neutral in 3-Wire System

Old 08-29-03, 08:58 AM
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Identifying Hot/Neutral in 3-Wire System

I'm installing a new wall oven, and the 4 wires in the box are all white. How can I determine which two are hot, which is neutral and which is ground?
Old 08-29-03, 01:21 PM
Ed Imeduc's Avatar
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Location: Mountain Williams Missouri
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all white

Id mark them at the panel. Pull them off and ring them out then you can mark the other end. Or If you know how ring the 2 hots out then just check witch one is the ground or neutral ED
Old 08-29-03, 02:11 PM
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Thanks, and sorry for the ignorance, but what does "ring them out" mean? Physically pulling them through doesn't seem like an option given the length between panel and box. Is there a testing tool I can use?
Old 08-29-03, 06:50 PM
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The wires inside of the box need to be color coded. White is only to be used for neutral or the grounded conductor. The ground must be bare or green. The hots can be just about any other colors, preferably black and red. You measure between two of the wires, when you have 240 volts, those are your two hot conductors. Now disconnect the neutral wire in the panel and make sure it's not touching anything. Measure between one of the hot wires and the neutral and ground wire. When you measure 120V, then you've found the ground. Reconnect the neutral wire in the panel. Make sure you reidentify those wires in both the panel and the oven box.

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