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Old 06-30-2011, 12:11 PM   #31
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wiring electric cooktop 4 wires to 3 wires


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Originally Posted by HouseHelper View Post
But the OP stated the existing wires were black/white/bare... if it were SE, they would be black/black or black/red/bare.
Depends....SE-U= bk/wh/bare ...SE-R= bk/rd/wh/bare

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Old 06-30-2011, 09:50 PM   #32
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wiring electric cooktop 4 wires to 3 wires


I've never seen SE-U cable with black/white/bare. Most of them that were marked were black/red/bare.
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Old 06-30-2011, 10:01 PM   #33
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wiring electric cooktop 4 wires to 3 wires


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And if the bare ground wire is carrying a current during normal operation what happens?
Prior to the 1996 edition of the Code, dual-voltage (120/240) dryers, ranges, cooktops, wall ovens, etc. were permitted to be installed using 3-wire cable, without a grounding conductor.

There was an exception in the Code that permitted the use of type SE cable for these circuits (when originating from the service panel), where the "bare" conductor consisted of several small strands twisted together. That conductor acted as a neutral, even though it was bare. The appliance was permitted to be grounded thru the neutral, using a bonding strap connected to the appliance frame.

Your existing circuit appears to be regular type NM cable (commonly called "romex") which has a solid bare grounding conductor present. This circuit was most likely for 240 Volts use only, as evidenced by the pigtail to your old cooktop. That bare wire is there only for grounding purposes, and is not the same thing as a neutral conductor, which is current-carrying during normal operation of the appliance.

Is there an operational difference between a single solid bare conductor, and a multi-strand bare concentric conductor? Not really.

The main difference here is one type of wire was permissible to be used as a current-carrying conductor, while the other is not. This is but one example of how the Code is manipulated by manufacturers' and special interest lobbyists, implementing rules that may or may not be in the best interests of safety.
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Old 07-02-2011, 03:29 AM   #34
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wiring electric cooktop 4 wires to 3 wires


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I've never seen SE-U cable with black/white/bare. Most of them that were marked were black/red/bare.
SE-U is Blk-Blk-bare Al(Southwire), maybe some earlier were fabricated with Blk-Rd-bare but in smaller Awg sizes under 1Awg. Depends on the mfr and when fabbed. Most old woven SE that I took out of older structures are Bk-Bk-bare copper.
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Old 07-02-2011, 06:12 AM   #35
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...but in smaller Awg sizes under 1Awg....
We are dealing with smaller sizes in this discussion. Most of the older stuff I have encountered had a red stripe on one of the conductors, but it was flaking off, due to its age ....

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