Nec 90.4

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hhsting

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Part of Nec 90.4 says following:
"......This Code may require new products, constructions, or materials that may not yet be available at the time the Code is adopted. In such event, the authority having jurisdiction may permit the use of the products, constructions, or materials that comply with the most recent previous edition of this Code adopted by the jurisdiction......."

Does that mean lets say AHJ has adopted NEC 2014 and their is product such as solar farm or new solar products or new ways of doing things etc is not in NEC 2014 but is in NEC 2017 then AHJ can enforce NEC 2017 in those instances? If not then what exactly is that paragraph saying?

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Not quite. If the AHJ adopted the most recent edition cart blanche it would still apply to things that don’t yet have a Code based on discretion. Just because a newer edition exists is independent of the meaning and is a separate issue.


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hhsting said:
Does that mean lets say AHJ has adopted NEC 2014 and their is product such as solar farm or new solar products or new ways of doing things etc is not in NEC 2014 but is in NEC 2017 then AHJ can enforce NEC 2017 in those instances? If not then what exactly is that paragraph saying?
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Older code, not newer:

"In such event, the authority having jurisdiction may permit the use of the products, constructions, or materials that comply with the most recent previous edition of this Code adopted by the jurisdiction......."
 
First NEC is written that anything not expressly prohibited is allowed at least from a Code perspective. Beyond Code it’s up to the AHJs discretion. This section really just clarifies that concept. So if some new technology, application, etc., comes along that is not covered by NEC it just says the AHJ has discretion to decide whether or not to accept it or to stipulate conditions on the acceptance.

Second each Code edition stands on its own. It supersedes all previous editions. It does not anticipate newer editions. When the NEC issues a new edition it supersedes the old one from their perspective. They do not write rules that say xxx effective at some future date. So there is nothing in the 2014 edition that anticipates or recognizes anything in the 2017!edition, nor that does anything except supersede the 2011 edition.

State regulations modify this. For instance New Jersey exempts all public schools and casinos from following Code. Many states frequently at least temporarily delete controversial sections and delay adoption for one or two editions. For instance several delayed the arc fault requirement. North Carolina for instance only adopts new editions on a 6 year cycle instead of 3.


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