Metal frame of a building

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Jpflex

Jpflex

Electrician big leagues
Location
Victorville
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Electrician commercial and residential
A 2011 NEC grounding and bonding book I have allows the metal frame of a building to be recognized as a grounding electrode conductor according to 250.52A2 but is this still valid? I thought I seen in mike holts daily tip that this was not allowed?

If not what is the code to disallow this?
 
Jpflex said:
A 2011 NEC grounding and bonding book I have allows the metal frame of a building to be recognized as a grounding electrode conductor according to 250.52A2 but is this still valid? I thought I seen in mike holts daily tip that this was not allowed?

If not what is the code to disallow this?
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It's OK for a GEC but not in lew of a EGC. Its also not just steel studs but more like pilings and heavy steel construction.
 
letgomywago said:
It's OK for a GEC but not in lew of a EGC. It’s also not just steel studs but more like pilings and heavy steel construction.
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Do you have to measure GEC dimensions to ensure cross section area of steel pickings meet GEC requirements for type of electrode used?
 
letgomywago said:
Not if it's steel in the footing bolted together to the rest of the building steel. It's like a ufer and is used for GEC for transformers and separate services in large buildings.
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I forgot what an ufer was but I read it in the book I have once
 
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