AIC Rating Cross Check from POCO

[brycenesbitt]

My AJH gave me this letter:

I received the AIC ratings for XXX Yyyyy Street
Single Phase.​

• 200A – 35,000A​
• 400A – 30,000A
  
  When we last spoke, you mentioned that you needed the ratings only, not an official letter. Let me know if that is still the case. If so, I will be closing this application.​

Now what's confusing me is I'd expect a larger service to have larger wire to have larger AIC.
What circumstances could result in the opposite ?

 

[jim dungar]

Now what's confusing me is I'd expect a larger service to have larger wire to have larger AIC.
What circumstances could result in the opposite ?

The size of the transformer, not the service, is usually the deciding factor.
A larger service may be fed from a small dedicated transformer, while a small service may be feed from a larger unit feeding multiple services.

 

[curt swartz]

Is this for a single family dwelling service? If so that eliminates using any combination service entrance equipment which maxes out at 22K.

For most of the 400 amp (class 320) services we install the plans show ~18K