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

[Natfuelbilll]

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



Please provide your experiences and examples of AHJ Special Permission, subjected to, or assisted by.



Was it received as written document?

 

[paul]

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



Please provide your experiences and examples of AHJ Special Permission subjected to our assisted by.



Was it received as written document?

Working clearance for duct heaters in a dropped ceiling. We had the inspector look at all the duct heaters (new, existing and relocated) and we worked together to get what we could and make it as compliant with 110.26 as we could. The three or for that didn't work, we got the permission. He wrote it down on the inspection card on the jobsite and on his own record.

 

[iwire]

I doubt many people have actually gotten "Special Permission" as defined in the NEC.

"Special Permission" must come in writting from the AHJ, in most areas the inspector on the job is not the AHJ.

 

[Natfuelbilll]

It will be interesting to learn then from the responses to this post.

 

[edamico11]

Not sure if this is what you mean but,,

Not sure if this is what you mean but,,

had a client who did not want to follow 210.52 rule. Said that the spacing would interfere with a specific tile back-splash pattern. So, I contacted the inspector, he produced a "variance for NEC" application. We wrote an argument, including the above and a part about having enough outlets in the effected area to run a kitchen, (yea I know,,,,) but it worked and we passed he attached the document, (variance) to our electrical application and away we went...

 

[jtester]

I've had to obtain written permission once or twice. The request is heard by the Technical Advisory Committee to the State Electrical Board.
One of our State Code rules modifies 230.70(A) and requires service entrance conductors to land on a service disconnect within 48" of where they enter the building. I had an MCC with a top feed and the conductors entered thru the floor, they measured just over 5' long, and the inspector required me to obtain written permission. Since they entered thru the bottom of the MCC enclosure and were entirely within the MCC housing, my request was approved. It was submitted and approved in writing

Jim T

 

[Natfuelbilll]

I can see where that extra distance still would meet the intention of the Code. Really now, is there ANY greater risk in an extra 12"?

Thank you for your reply.

 

[edamico11]

I can see where that extra distance still would meet the intention of the Code. Really now, is there ANY greater risk in an extra 12"?

No that is why they let you have variances,,, thank God

 

[Natfuelbilll]

Are they variances, or special permission?

 

[edamico11]

Are they variances, or special permission?

Mine is what the town inspector called a variance.

 

[Natfuelbilll]

Is the term "variance" in the NEC, or a local code term?

 

[Bob NH]

Is the term "variance" in the NEC, or a local code term?

In many jurisdictions (including my town), building codes are adopted as part of the zoning and land use ordinances. There is an established formal procedure for permitting departures from land use ordinances by means of a "variance", and that practice and use of the term is sometimes applied (perhaps carelessly or informally) to departures from building codes that are sometimes approved by the "Board of Adjustment" or other agency having jurisdiction.

 

[edamico11]

Natefuelbill

Natefuelbill

"See section 110.3, and 90.4 enforcement. Also the art 100 definition of special permission means per 90.4 that special permission must be in writing.
In short, your AHJ decides, if a condition exists that requires a variance from the NEC, special permission must be in writing. "

This cites the NEC code section, it seems that variance and special permission, in this case, are one in the same.

ed

 

[Natfuelbilll]

What are some more examples of special permission ?

 

[edamico11]

Well,,

Well,,

don't really want to be known for this but,,, it is the holidays.

I know of a case where a HO put 2 A/C units 18" apart from one another, problem is he put one of the disconnects in the 18" space. The inspector cited NEC 110.26 "red ticket". Another special permission form came to bear,, using the reason; "a concrete slab was poured when only 1 unit was to be used, after construction it was realized a second unit was needed". again, passed stapled to permit and filed with town.

Just curious, is there something specific you are looking for?

 

[Natfuelbilll]

Since you asked.

Someone (not me) is wanting to receive special permission on a overload element sized at 143%.

(Motor starts fine, but will some times trip, with properly sized OL.)
(I think the motor is undersized...)

If you were an AHJ, would you give this SP?




Other than that, I am just interested in this kind of stuff.

 

[iwire]

If you were an AHJ, would you give this SP?

Not likely.

Perhaps if the motor manufacturer provided something in writing that they feel it is the appropriate move.

It sounds like the OL is doing it's job.

 

[JohnJ0906]

To be honest, my first question would be, "What is causing OLs to trip?" if they are properly sized

 

[Natfuelbilll]

They are improperly sized (and now holding), the properly sized overloads tripped.

 

[steve066]

They are improperly sized (and now holding), the properly sized overloads tripped.

My guess is that the motor will eventually "trip". Hopefully, it does it in a rather peaceful way.

I would also guess that the motor is either undersized, or that there is some other problem with the motor or installation (bad bearing or incorrect alignment for example.)

Steve