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Posted by Bruce in Bangkok on May 2, 2008, 10:51 am
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>On Fri, 02 May 2008 13:03:02 +0700, Bruce in Bangkok
>
>>On Thu, 01 May 2008 20:42:06 -0500, "Martin H. Eastburn"
>>
>>>The copper clad can carry hundreds of amps when asked upon. The steel can't.
>>>Electrons flow on the skin. A clamp on the outside puts or gets electrons
>>>to or from the ground.
>>
>>Just a quick question here. If the extremely thin electroplated
>>coating on a steel ground rod will carry hundreds of amps, as you say,
>>hows come my 250 amp welder has them big thick cables coming out the
>>front, there?
>>
>>
>That ground rod is only needed to carry that hundreds of amps for a
>split second*, until the breaker trips or the lighting strike is over.
>
>*Or a few seconds as a worst case senerio.
>
>
>
>Thank You,
>Randy
>
>Remove 333 from email address to reply.
If you have ever seen the results of an actual lightening strike you
wouldn't be quite so casual about the amount of current the ground
circuit is required to carry.
Now, if you are talking about "static grounds" as used on airfields or
around fuel storage systems that is a totally different proposition.
Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)
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Posted by SteveB on May 2, 2008, 1:03 pm
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> On Thu, 01 May 2008 20:42:06 -0500, "Martin H. Eastburn"
>
>>The copper clad can carry hundreds of amps when asked upon. The steel
>>can't.
>>Electrons flow on the skin. A clamp on the outside puts or gets electrons
>>to or from the ground.
>
> Just a quick question here. If the extremely thin electroplated
> coating on a steel ground rod will carry hundreds of amps, as you say,
> hows come my 250 amp welder has them big thick cables coming out the
> front, there?
>
>
> Bruce-in-Bangkok
> (correct Address is bpaige125atgmaildotcom)
In my brain, a ground rod is for emergency path of current, and not a
constant flow.
What do I win?
Am I right?
Steve
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Posted by Bruce in Bangkok on May 2, 2008, 8:40 pm
Please log in for more thread options On Fri, 2 May 2008 09:03:32 -0800, "SteveB"
>
>> On Thu, 01 May 2008 20:42:06 -0500, "Martin H. Eastburn"
>>
>>>The copper clad can carry hundreds of amps when asked upon. The steel
>>>can't.
>>>Electrons flow on the skin. A clamp on the outside puts or gets electrons
>>>to or from the ground.
>>
>> Just a quick question here. If the extremely thin electroplated
>> coating on a steel ground rod will carry hundreds of amps, as you say,
>> hows come my 250 amp welder has them big thick cables coming out the
>> front, there?
>>
>>
>> Bruce-in-Bangkok
>> (correct Address is bpaige125atgmaildotcom)
>
>In my brain, a ground rod is for emergency path of current, and not a
>constant flow.
>
>What do I win?
>
>Am I right?
>
>Steve
>
The problem with the discussion is that there are a number of
different types of "grounds". One, for example, the "static ground" is
designed to dissipate static electricity to avoid igniting fuel during
a re-fueling operation. It has been many years since I worked on that
type of system but if I remember correctly the resistance can be in
the 1,000's of ohms.
Then we have the grounds used with lightening rod systems that may be
required to carry Mega, or Giga-amps of current.
Then there are the ground systems for radio antenna systems and
grounds for safety (and maybe even grounds for grounds :-).
What kind of ground are we talking about.
Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)
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Posted by SteveB on May 3, 2008, 12:28 am
Please log in for more thread options
> On Fri, 2 May 2008 09:03:32 -0800, "SteveB"
>
>>
>>> On Thu, 01 May 2008 20:42:06 -0500, "Martin H. Eastburn"
>>>
>>>>The copper clad can carry hundreds of amps when asked upon. The steel
>>>>can't.
>>>>Electrons flow on the skin. A clamp on the outside puts or gets
>>>>electrons
>>>>to or from the ground.
>>>
>>> Just a quick question here. If the extremely thin electroplated
>>> coating on a steel ground rod will carry hundreds of amps, as you say,
>>> hows come my 250 amp welder has them big thick cables coming out the
>>> front, there?
>>>
>>>
>>> Bruce-in-Bangkok
>>> (correct Address is bpaige125atgmaildotcom)
>>
>>In my brain, a ground rod is for emergency path of current, and not a
>>constant flow.
>>
>>What do I win?
>>
>>Am I right?
>>
>>Steve
>>
>
> The problem with the discussion is that there are a number of
> different types of "grounds". One, for example, the "static ground" is
> designed to dissipate static electricity to avoid igniting fuel during
> a re-fueling operation. It has been many years since I worked on that
> type of system but if I remember correctly the resistance can be in
> the 1,000's of ohms.
>
> Then we have the grounds used with lightening rod systems that may be
> required to carry Mega, or Giga-amps of current.
>
> Then there are the ground systems for radio antenna systems and
> grounds for safety (and maybe even grounds for grounds :-).
>
> What kind of ground are we talking about.
>
>
> Bruce-in-Bangkok
> (correct Address is bpaige125atgmaildotcom)
In my case, a ground rod required next to the incoming 500Amp (large
building) electrical service.
Steve
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Posted by Bruce in Bangkok on May 3, 2008, 1:32 am
Please log in for more thread options On Fri, 2 May 2008 20:28:31 -0800, "SteveB"
>
>> On Fri, 2 May 2008 09:03:32 -0800, "SteveB"
>>
>>>
>>>> On Thu, 01 May 2008 20:42:06 -0500, "Martin H. Eastburn"
>>>>
>>>>>The copper clad can carry hundreds of amps when asked upon. The steel
>>>>>can't.
>>>>>Electrons flow on the skin. A clamp on the outside puts or gets
>>>>>electrons
>>>>>to or from the ground.
>>>>
>>>> Just a quick question here. If the extremely thin electroplated
>>>> coating on a steel ground rod will carry hundreds of amps, as you say,
>>>> hows come my 250 amp welder has them big thick cables coming out the
>>>> front, there?
>>>>
>>>>
>>>> Bruce-in-Bangkok
>>>> (correct Address is bpaige125atgmaildotcom)
>>>
>>>In my brain, a ground rod is for emergency path of current, and not a
>>>constant flow.
>>>
>>>What do I win?
>>>
>>>Am I right?
>>>
>>>Steve
>>>
>>
>> The problem with the discussion is that there are a number of
>> different types of "grounds". One, for example, the "static ground" is
>> designed to dissipate static electricity to avoid igniting fuel during
>> a re-fueling operation. It has been many years since I worked on that
>> type of system but if I remember correctly the resistance can be in
>> the 1,000's of ohms.
>>
>> Then we have the grounds used with lightening rod systems that may be
>> required to carry Mega, or Giga-amps of current.
>>
>> Then there are the ground systems for radio antenna systems and
>> grounds for safety (and maybe even grounds for grounds :-).
>>
>> What kind of ground are we talking about.
>>
>>
>> Bruce-in-Bangkok
>> (correct Address is bpaige125atgmaildotcom)
>
>In my case, a ground rod required next to the incoming 500Amp (large
>building) electrical service.
>
>Steve
>
Just had a talk with an Australian "Sparky", a licensed professional
electrician for probably 50 years. He tells me that according to
Australian code the ground to any building entrance (I'm using U.S.
terminology here) is the same size wire according to Australian code.
He gave me the wire code but as it is not AWG or metric I have no idea
what the actual size is, other then he said it was larger then normal
wiring in the building.
Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)
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