Queston On 240 Plugs and Receptacles


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Old 06-17-13, 02:30 PM
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Queston On 240 Plugs and Receptacles

Mod note: Post separated from http://www.doityourself.com/forum/el...off-stove.html. First part copied back to that post..



     

    Last edited by ray2047; 06-17-13 at 03:31 PM.
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    Old 06-17-13, 03:29 PM
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    Why would you want to use the cumbersome 14-30's on 20 amp circuits? I guess because they are there, huh? I'm using 3 pronged receptacles on all my power tools in the shop, but that's the way the motors are wired..
     
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    Old 06-18-13, 05:22 AM
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    Sorry, mixed up from editing there.
    Upgraded dryer outlets to newer 14-30 four wire plugs and outlets. (House and rentals).
    The extra cords and outlets are old fashioned drier plugs, NEMA 10-30 three wire, three prong.

    For 240v equipment, modern plug is 6-30, with two hots and ground. Old dryer plug is 10-30 with two hots and neutral.

    Does code allow 10-30s to be reuse and rewired as 240v grounded connectors;
    or does code require that millions of old cords and outlets get chucked into the landfill?
     

    Last edited by Hal_S; 06-18-13 at 05:42 AM.
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    Old 06-18-13, 05:39 AM
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    Grandfathered only as long as in use for original purpose. The original purpose was never for shop tools. The receptacle does not have a ground. Code says you must follow the manufacturer's recommendation. If the manufacturer says a grounded plug (or connection) then you must use a grounded plug (or connection). The plug isn't grounded and the receptacle isn't grounded. The use of this plug and receptacle was when allowed a very specific exception to the code. Shop tools were never part of that exception.
     
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    Old 06-18-13, 05:57 AM
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    Grandfathered only as long as in use for original purpose.
    Curious now, what's the actual language and code cite for that?

    "Original purpose" was a general purpose outlet, providing 240v with grounding through neutral, correct?
     
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    Old 06-18-13, 06:02 AM
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    It was never designated for use as a 240 volt receptacle. It was designated as a 120/240 receptacle. Your shop tools are not 120/240 in most if not all cases.
     
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    Old 06-18-13, 06:11 AM
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    It was never designated for use as a 240 volt receptacle. It was designated as a 120/240 receptacle.
    Yes, I know it was LATER given the NEMA designation of 10-30,

    I'm asking about two things that are rather different,


    (1) the code citation on original purpose

    and

    (2) the original purpose it was DESIGNED for.


    The unsolved 120v/204v question from a prior discussion
       

      Last edited by Hal_S; 06-18-13 at 06:27 AM.
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      Old 06-18-13, 10:10 AM
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      The unsolved 120v/204v question from a prior discussion
      What is unsolved there ?
       
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      Old 06-18-13, 10:15 AM
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      Art. 406.10 , (B) , Grounding-Pole Identification, requires Grounding-Type receptacles to have the receptacle Grounding termination to be so "identified".
       
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      Old 06-18-13, 11:19 AM
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      Originally Posted by Nashkat1

      What is unsolved there ?
      The original rationale for connecting a live current carrying wire to the appliance chassis...

      I figure that the earliest electric stoves would be pure 240v; the later additions of things like clock, timer and light bulb were overlooked.

      But, as noted below, with a dryer there is always a fair sized motor, directly connected to the chassis...
         
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        Old 06-18-13, 02:16 PM
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        The 3-wire connection was permitted in WWII as an effort to save copper. Why they didn't stop permitting it after that, I don't know. Nowadays it just makes a PITA.
         
         

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