110.22 -- what goes in the blank?

[hmspe]

My office policy has been to use a rating like "22K/10K" in the blank when I specify a 110.22 label. Today I had a plan review comment under the 2005 NEC asking for the calculated fault current in the blank. I know that in '93 we inserted the "amps available". The text since '99 (I don't have a '96 handy) uses the term "rated" before the blank.

Is there a clear statement of what should go in the blank? I found proposal 1-97 Log #564 NEC-P01 which indicates that the calculated available fault current is not what is expected, but the Panel's rejection comment never really says what should go there.

 

[Smart $]

My office policy has been to use a rating like "22K/10K" in the blank when I specify a 110.22 label. Today I had a plan review comment under the 2005 NEC asking for the calculated fault current in the blank. I know that in '93 we inserted the "amps available". The text since '99 (I don't have a '96 handy) uses the term "rated" before the blank.

Is there a clear statement of what should go in the blank? I found proposal 1-97 Log #564 NEC-P01 which indicates that the calculated available fault current is not what is expected, but the Panel's rejection comment never really says what should go there.

Not fully "versed" on this matter, but I understand it as follows:

Scroll down to Figures 3 & 4 in this article...

http://www.iaei.org/magazine/?p=3199

The Series Rated Combination A.I.R. value (in green annotation box) is what goes in the blank... not the calculated [available] fault current value (which is always less than the former).

If the plans examiner wants to know what the calculated [or POCO reported] available fault current is, supply such separately.