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Old 02-23-2008, 04:44 PM   #31
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Sub Panel Grounding Question.


Do you guys want my long version or short version.......

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Old 02-23-2008, 04:54 PM   #32
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Sub Panel Grounding Question.


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Originally Posted by CowboyAndy View Post

When there is a lightning strike, WHY will it go to earth instead of through the service neutral?
This a lot like the question; what does an 800 pound gorilla eat for breakfast?

answer; anything he wants

Something as powerful as lightning with its billion volts goes anywhere it wants. All we really do is try to direct it away from things we do not want blown up.

Sometimes it works; sometimes it doesn't.

that is why I am willing to help the neighbor pay for a lightning arrestor system. I figure the air terminals on his house will be more attractive than my little ol house so it will flow to his house and avoid mine. I figure if the air terminals are on my house, it is like standing up at the biker bar and yelling HD sucks. Nothing worse than intentionally drawing attention to yourself.
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Old 02-23-2008, 05:50 PM   #33
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Sub Panel Grounding Question.


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Originally Posted by nap View Post
This a lot like the question; what does an 800 pound gorilla eat for breakfast?

answer; anything he wants

Something as powerful as lightning with its billion volts goes anywhere it wants. All we really do is try to direct it away from things we do not want blown up.

Sometimes it works; sometimes it doesn't.

that is why I am willing to help the neighbor pay for a lightning arrestor system. I figure the air terminals on his house will be more attractive than my little ol house so it will flow to his house and avoid mine. I figure if the air terminals are on my house, it is like standing up at the biker bar and yelling HD sucks. Nothing worse than intentionally drawing attention to yourself.
Your theory is off, Lightning systems do not attract lighting... neither do ground rods...
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Old 02-23-2008, 06:12 PM   #34
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Sub Panel Grounding Question.


Long version.
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Old 02-23-2008, 06:19 PM   #35
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Sub Panel Grounding Question.


Guess I never really thought about it, one of those things, teacher says do it this way and we do it. Thanks for opening my eyes, sorry for the question phrased that way Petey. Guess I better heed my signature line and get tough because I sure have been dense on grounding.
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Old 02-23-2008, 06:26 PM   #36
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Sub Panel Grounding Question.


Twister, let me be the first to say thank you for that post. That shows real character.
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Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.
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Old 02-23-2008, 06:30 PM   #37
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Sub Panel Grounding Question.


Stealing somebody elses signature line
"if your gonna be stupid you better be tough"
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Old 02-23-2008, 06:49 PM   #38
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Sub Panel Grounding Question.


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Originally Posted by wire_twister View Post
Guess I never really thought about it, one of those things, teacher says do it this way and we do it. Thanks for opening my eyes, sorry for the question phrased that way Petey. Guess I better heed my signature line and get tough because I sure have been dense on grounding.
It isn't hard to get grounding confused. It is the most mis-applied section of the Code. Seems hardly anyone understands it, and I think this is mostly due to the language used. If all our green or bare circuit wires were called "bond conductors" instead of "grounding conductors", and define them properly in the code, we'd be on the right track to eliminating this confusion.

Become an expert on grounding and bonding, and other electricians will be in utter awe of your knowledge.

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Old 02-23-2008, 06:58 PM   #39
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Sub Panel Grounding Question.


Robert

This thread has two directions one being is earth a fault path for opening an overcurrent device and your original question about when ground rods are required at sub-panels any why 3 wire feeders vs 4 wire feeders vs a single 120 volt branch circuit making a difference whether we use ground rods or not.
Are you wanting the reason for ground rods at detached structures and when the NEC requires them or are you wanting to know about earth and grounding, grounded and ground and how it pertains to the electrical system?
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Old 02-23-2008, 07:18 PM   #40
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Sub Panel Grounding Question.


Why use a ground rod on a 4 wire isolated ground detatched sub panel. We haven't been using them for years on manufactured homes.
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Old 02-23-2008, 07:30 PM   #41
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Sub Panel Grounding Question.


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Why use a ground rod on a 4 wire isolated ground detatched sub panel. We haven't been using them for years on manufactured homes.
Because of 250.32(A)

Name:  250.32(A).jpg
Views: 145
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Last edited by chris75; 02-23-2008 at 07:44 PM.
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Old 02-23-2008, 07:38 PM   #42
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Sub Panel Grounding Question.


Never failed an inspection.
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Old 02-23-2008, 07:39 PM   #43
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Sub Panel Grounding Question.


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Never failed an inspection.
Thats too bad... show them 250.32(A)

New York does not have continuing education classes?

Last edited by chris75; 02-23-2008 at 07:43 PM.
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Old 02-23-2008, 07:53 PM   #44
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Sub Panel Grounding Question.


Are your manufactured homes on permanent foundations? The equipment ground in the four wire feeder has nothing to do with whether or not you have a ground rod they serve different purposes. Your mentioning of a four wire feeder tells me that the service equipment is not attached to the manufactured home. Second a manufactured home is a different duck depending on circumstances than.... say a detached garage.

Is your question centered around if I have a ground with the feeder why would I need a ground rod?
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Old 02-23-2008, 08:06 PM   #45
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Sub Panel Grounding Question.


Quote:
Originally Posted by Robert Shields View Post
Never failed an inspection.
This does not surprise me in the least.


Quote:
Originally Posted by chris75 View Post
New York does not have continuing education classes?
Not at all.

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Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.
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