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NECArticle250Sections250.1-250.4~20020123.htm
On Nov 3, 2009, at 9:08 AM, Mark Robinson wrote:
> Grounding conductors shall not be connected to a terminal bar
> provided for
> grounded conductors (may be a neutral) unless the bar is identified
> for the
> purpose and is located where interconnection between equipment
> grounding
> conductors and grounded circuit conductors is permitted or required by
> Article 250.
>
>
>
> what does article 250 say
>
>
> ----- Original Message -----
> From: "Ian Hill - K8MM" <ihk8mm@charter.net>
> Cc: <amps@contesting.com>
> Sent: Tuesday, 03 November, 2009 10:49 AM
> Subject: Re: [Amps] TL922 Power Plugs
>
>
>> You beat me to it....lol
>>
>> Ian - K8MM
>>
>> maflynn@att.net wrote:
>>> Not allowed by code: NFPA 70: 408.20 Grounding of Panelboards.
>>> Panelboard cabinets and panelboard frames, if of metal, shall be in
>>> physical contact with each other and shall be grounded. Where the
>>> panelboard is used with nonmetallic raceway or cable or where
>>> separate
>>> grounding conductors are provided, a terminal bar for the grounding
>>> conductors shall be secured inside the cabinet. The terminal bar
>>> shall be
>>> bonded to the cabinet and panelboard frame, if of metal;
>>> otherwise it
>>> shall be connected to the grounding conductor that is run with the
>>> conductors feeding the panelboard.
>>>
>>>
>>> Grounding conductors shall not be connected to a terminal bar
>>> provided
>>> for grounded conductors (may be a neutral) unless the bar is
>>> identified
>>> for the purpose and is located where interconnection between
>>> equipment
>>> grounding conductors and grounded circuit conductors is permitted or
>>> required by Article 250.
>>>
>>>
>>> -------------- Original message from "Mark Robinson"
>>> <markrob@mindspring.com>: --------------
>>>
>>>
>>>
>>>> My Neutral and Ground is connected at the main panel but also at
>>>> the
>>>> barn
>>>> 300 feet away. I am running a 3 wire 100 amp 240v power 4 00
>>>> aluminum
>>>> line
>>>> to the barn from a 100 amp 240v breaker located in my main
>>>> distribution
>>>> box.
>>>> I didn't like the idea of a gnd neutral tie that far away from
>>>> the barn,
>>>> so
>>>> I tied them together at the barn with a second ground rod
>>>> located at the
>>>> barn. Is that such a bad idea?
>>>>
>>>> Mark
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Ian Hill - K8MM"
>>>> Cc:
>>>> Sent: Tuesday, 03 November, 2009 10:24 AM
>>>> Subject: Re: [Amps] TL922 Power Plugs
>>>>
>>>>
>>>>
>>>>> There isn't anything ILLEGAL about connecting the neutral and
>>>>> ground
>>>>> anywhere else beside the main panel. You're violating the NEC
>>>>> but not
>>>>> committing a criminal offense. ;-)
>>>>>
>>>>> K8MM
>>>>>
>>>>>
>>>>> Jim Brown wrote:
>>>>>
>>>>>> On Thu, 29 Oct 2009 18:17:21 -0400, Ian Hill - K8MM wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Houses are typically feed off of a center tapped secondary. 240V
>>>>>>> measured between phase conductors and 120V between either phase
>>>>>>> conductor and the center tap. There isn't any sort of
>>>>>>> dangerous short
>>>>>>> by having the neutral ( i.e. center tap) and the ground bonded
>>>>>>> together
>>>>>>> in the primary distribution panel in a house....its supposed
>>>>>>> to be
>>>>>>> connected that way.
>>>>>>>
>>>>>>>
>>>>>> Exactly right. One other VERY important point -- it is both
>>>>>> ILLEGAL
>>>>>> and
>>>>>> UNSAFE to connect neutral to ground at any other point. The
>>>>>> proper
>>>>>> connection of a 240V load is to the two ends of the
>>>>>> transformer only,
>>>>>> and with the ground wire connected for safety.
>>>>>>
>>>>>> There is some equipment that needs both 240V and 120V to
>>>>>> operate. That
>>>>>> equipment gets its 240V from the two ends of the transformer,
>>>>>> and MUST
>>>>>> get 120V between one side of the transformer and NEUTRAL, NOT
>>>>>> GROUND.
>>>>>>
>>>>>> 73,
>>>>>>
>>>>>> Jim Brown K9YC
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>>
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>>>>>
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>>
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