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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