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red bulletStaff Notes and Illustrations for Article 250
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Grounding and Bonding: Closely Related Terms, But Different Functions

click to enlarge In any discussion of grounding and bonding, questions such as the following often arise: What does grounded mean? Does bonded mean the same thing as grounded? If a piece of equipment is grounded, is it also bonded? Can something
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Code Topic for July: Grounding
and Bonding

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 Cracking the Code
Q. My interpretation of 250.52(A)(3), Concrete-Encased Electrode, is that you must install something in the footing or foundation to complete bonding. If I have footings or a foundation that do not consist of bars or rods in the concrete or they do not meet the minimum requirements, I must install 6.0 m (20 ft) of bare copper #4 AWG conductor. Is this interpretation accurate?
Answer
 

 Fast Fact
For the 2008 NEC®, a temporary 20th Code-Making Panel (CMP) was added to write a new Article 585 on “Critical Operations Power Systems.”
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 Code Check
Is an aluminum conductor permitted to be used as a main bonding jumper?
 
    Answer  

 Around the Circuit
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