AHJ Approving of an Oversized or Underrated Equipement

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natfuelbill

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NEC 100
Special Permission. The written consent of the authority having jurisdiction.


Please provide examples of Special Permission experienced.




Can attachments be allowed for this Post?
 
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AHJ -authority having jurisdiction
IMO - in my opinion

That is a good question on the approval, since what I have picked up from the forum, the AHJ has no liability. Can you provide an more info?

Tony
 
In my opinion, approval by the AHJ does not relieve the electrician from compliance with the code. If the AHJ is granting "special permission" for an exception to the code, that permission must be in writing and should justify the reason that the exception is needed. The AHJ does have a great deal of authority but it is limited. Also make sure that the inspector is in fact the AHJ, often that is no the case. Just because an inspector "misses" a violation, it is still a violation.
 
I don't recall it being written, but here is an example of what I believe is special permission.

We installed a generator and transfer switch at a home, and as usual, we had to separate the neutrals and EGC's in what is now a sub-panel, since the disconnect is where the bond must be relocated.

Any time you have an SE cable or an insulated-neutral cable (neutral serving as EGC, no longer allowed) feeding a major appliance, and it's fed from a panel that is having the neutrals and EGC's separated, you have to re-feed the appliance with a 3-conductor-plus-EGC cable.

This is one of the few non-grandfathered rules in the NEC.

Anyway, because of the construction of the house, it would have been impossible to run a new cable along the same pathway between the garage and the house, which are connected by a breezeway and a sun-room, and virtually impossible (i'e', expen$ive) to run any other way.

The inspector agreed with my proposal to white-tape the bare conductor in the SE cables in the panel, and land them on the now-isolated neutral bus. Since this is using the neutral as the EGC, and not the other way around, it was the better solution.
 
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