The 2020 NEC 310. 15 Ampacity Tables requires conductor adjustment per (A) through (F) of the article.
(A) Using the 90-degree column #12, the AWG value is 30 amps. Adjusting per 110.14, the #12 may never be used for a temperature greater than the 60-degree column which is 20 amps (the breakers are rated at 75 degrees, but the devices are rated at 60 degrees and 110.14 limits the max to 60 Degrees).
(C)(1) Adjustment Factors. 21-30 conductors derate conductor to 45% of 30amps = 13.5 amps
240.4 (D) Small Conductors.
Unless specifically permitted in 240.4(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7) after any correction factors for ambient temperature and number of conductors have been applied.
(B) Overcurrent Devices Rated 800 Amperes or Less.
The next higher standard overcurrent device rating (above the ampacity of the conductors being protected) shall be permitted to be used, provided all of the following conditions are met:
(1) The conductors being protected are not part of a branch circuit supplying more than one receptacle for cord-and-plug-connected portable loads.
(2) The ampacity of the conductors does not correspond with the standard ampere rating of a fuse or a circuit breaker without overload trip adjustments above its rating (but that shall be permitted to have other trip or rating adjustments).
(3) The next higher standard rating selected does not exceed 800 amperes.
110.3 (A) & (B) You have equipment installed in each of the exam rooms that require a minimum of 20 amp branch circuits.
220.14(I) (I) Receptacle Outlets.
Except as covered in 220.14(J) and (K), receptacle outlets shall be calculated at not less than 180 volt-amperes for each single or for each multiple receptacle on one yoke. A single piece of equipment consisting of a multiple receptacle comprised of four or more receptacles shall be calculated at not less than 90 volt-amperes per receptacle. This provision shall not be applicable to the receptacle outlets specified in 210.11(C)(1) and (C)(2).
220.12 Lighting Load for Non-Dwelling Occupancies.
(A) General.
A unit load of not less than that specified in Table 220.12 for non-dwelling occupancies and the floor area determined in 220.11 shall be used to calculate the minimum lighting load. Motors rated less than 1⁄8 HP and connected to a lighting circuit shall be considered general lighting load.
210.20 Overcurrent Protection.
Branch-circuit conductors and equipment shall be protected by overcurrent protective devices that have a rating or setting that complies with 210.20(A) through (D).
(A) Continuous and Noncontinuous Loads.
Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load.
1) General.
Branch-circuit conductors shall have an ampacity not less than the larger of 210.19(A)(1)(a) or (A)(1)(b) and comply with 110.14(C) for equipment terminations.
(a)
Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size shall have an ampacity not less than the noncontinuous load plus 125 percent of the continuous load in accordance with 310.14.
(b)
The minimum branch-circuit conductor size shall have an ampacity not less than the maximum load to be served after the application of any adjustment or correction factors in accordance with 310.15.
Now all that being said Panel A has 40, 20 amp Branch circuit breakers 1, 2pole 20A and panel B has 41, 20 amp branch circuit breaker and 12, 15 amp branch circuit breaker.
So when we review the calculations above the minimum conductor requirement of continuous loads require a conductor rated for the 20 amps needed not 13.5 amps.
Mr. Andrassi. You will be required to increase the wire size, as noted in Shane's corrections notice. The branch circuits will be required to be run in additional raceways so as not to exceed nine current-carrying conductors, or you may change the current-carrying conductors to # 10 copper. Please make the corrections as quickly as possible and request an inspection. I have approved the revisions to the plans and will need these corrections and any other items noted in order to approve a temp Certificate of Occupancy
