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Subject Author Date
Load Center Bus Bar Burhans 02-08-2005
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Posted by HorneTD on February 10, 2005, 7:11 pm


>> > If the instructions in the panel allow more than one wire per terminal
>> > then you may combine that many Equipment Grounding Conductors under each
>> > screw. The US National Electric Code forbids terminating two or more
>> > grounded current carrying conductors; which most of us call the neutral;
>> > in the same terminal. This is to avoid the accidental disconnection of
>> > one circuits neutral while troubleshooting another circuit and the
>> > attendant risk of injury and equipment damage.
>> >
>> Obviously an accidental disconnection of a neutral leaves a hot with no good
>> way back to ground, other than through a person unlucky enough to be
>> touching it, if it is somehow shorted. A 3wire dryer circuit is
>> particularly dangerous because then the whole frame is hot, and it is often
used when wet. But wouldn't the normal consequence just be that a circuit no
longer works?

>> Except in odd circumstances, is really isn't all that dangerous, other than
the dryer example. There is no real exposure to equipment damage is there? Or
am I missing something?

> Any manufacturers grounding blocks should fit, NEVER DOUBLE GROUND unless you
want insurance cancellations after the fire. Home Depot has em for a couple
bux.

>
What is meant by double grounding is not clear.

As to using any ground bar that fits I'm sorry but this is bad
information. If a part is not laboratory listed or recognized as
suitable for use in that manufacturers enclosure than that WILL
jepordize your fire insurance coverage.
--
Tom Horne


Special 468x60
Posted by HorneTD on February 10, 2005, 7:01 pm


toller wrote:
>>If the instructions in the panel allow more than one wire per terminal
>>then you may combine that many Equipment Grounding Conductors under each
>>screw. The US National Electric Code forbids terminating two or more
>>grounded current carrying conductors; which most of us call the neutral;
>>in the same terminal. This is to avoid the accidental disconnection of
>>one circuits neutral while troubleshooting another circuit and the
>>attendant risk of injury and equipment damage.
>>
>
> Obviously an accidental disconnection of a neutral leaves a hot with no good
> way back to ground, other than through a person unlucky enough to be
> touching it, if it is somehow shorted. A 3wire dryer circuit is
> particularly dangerous because then the whole frame is hot, and it is often
> used when wet.
> But wouldn't the normal consequence just be that a circuit no longer works?
> Except in odd circumstances, is really isn't all that dangerous, other than
> the dryer example. There is no real exposure to equipment damage is there?
> Or am I missing something?

Many solid state controlled appliances can be damaged by having the hot
and no neutral. The disconnected neutral itself will go high to 120
volts if there is any connected load on the circuit. Additionally the
neutrals of two different circuits will expand and contract at different
times which will tend to loosen the connection.
--
Tom H


Posted by Burhans on February 10, 2005, 8:19 pm


There is an optional Eqiupment Ground which can be installed in the box. I
will purchase this ground and install it as listed on the box.


> toller wrote:
>>>If the instructions in the panel allow more than one wire per terminal
>>>then you may combine that many Equipment Grounding Conductors under each
>>>screw. The US National Electric Code forbids terminating two or more
>>>grounded current carrying conductors; which most of us call the neutral;
>>>in the same terminal. This is to avoid the accidental disconnection of
>>>one circuits neutral while troubleshooting another circuit and the
>>>attendant risk of injury and equipment damage.
>>>
>>
>> Obviously an accidental disconnection of a neutral leaves a hot with no
>> good way back to ground, other than through a person unlucky enough to be
>> touching it, if it is somehow shorted. A 3wire dryer circuit is
>> particularly dangerous because then the whole frame is hot, and it is
>> often used when wet.
>> But wouldn't the normal consequence just be that a circuit no longer
>> works? Except in odd circumstances, is really isn't all that dangerous,
>> other than the dryer example. There is no real exposure to equipment
>> damage is there? Or am I missing something?
>
> Many solid state controlled appliances can be damaged by having the hot
> and no neutral. The disconnected neutral itself will go high to 120 volts
> if there is any connected load on the circuit. Additionally the neutrals
> of two different circuits will expand and contract at different times
> which will tend to loosen the connection.
> --
> Tom H




Posted by Matt on February 11, 2005, 2:01 pm


Did you hear the one about the load center that took a bus to the bar?
It seems it was a very *short* trip! Get it? HAHAHHAH Oh golly I crack
myself up sometimes.



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