AIC fault current calculations

[Joseph P. McCarty]

I am an architect and am struggling to find how to calculate AIC fault at service disconnect. I am designing a service for a small industrial tenant bay. The local power company (FPL) has given me estimated symmetrical amperes at the transformer secondary terminals. I am at a total loss as to what to do next. I do not find anything in the NEC that deals with this. I tried looking at Red Vector course catalog to take a course and have found nothing. I would appreciate any help or direction to somewher to learn this.

Thanks for any help.

Joe McCarty, Stuart, Florida

 

[bphgravity]

I think it would be best for you to consult a P.E. licensed under F.S. 471. What you are asking about is a highly technical calculation that requires a fundemental understanding of electricity.

Is the occupancy in question subject to the exceptions in Chapter 1 of the FBC, Section 105?

 

[barbeer]

Bryan- are you referring to the annual facility permit by section 105?

 

[bphgravity]

No, this part:

105.3.1.2 No permit may be issued for any building construction, erection, alteration, modification, repair, or addition unless the applicant for such permit provides to the enforcing agency which issues the permit any of the following documents which apply to the construction for which the permit is to be issued and which shall be prepared by or under the direction of an engineer registered under chapter 471 Florida Statutes:
1. Electrical documents for any new building or addition which requires an aggregate service capacity of 600 amperes (240 volts) or more on a residential electrical system or 800 amperes (240 volts) or more on a commercial or industrial electrical system and which costs more than $50,000.

I am not a huge fan of architects trying to design electrical systems above and beyond their scope of expertise.

 

[ron]

If the local jurisdiction will allow him to sign off on the design, I have no problem helping a fellow professional.
There are loads of information on the Internet such as http://www.bussmann.com/library/docs/EPR_Booklet.pdf
Bussman has a lot of good information along with many others.

 

[barbeer]

I am not a huge fan of architects trying to design electrical systems above and beyond their scope of expertise.

Or homeowners installing those systems!?

 

[kingpb]

I think by the statement that he is at a total loss as to what to do, means that he is not qualified to sign the electrical drawings in the State of Florida, and therefore the OP needs to contact an electrical engineer qualified to do these calculations.

 

[Krim]

I think by the statement that he is at a total loss as to what to do, means that he is not qualified to sign the electrical drawings in the State of Florida, and therefore the OP needs to contact an electrical engineer qualified to do these calculations.

I would have to agree, he had stated that he is an " architect designing a service for a small industrial tenant bay."
Why would an architect be designing the electrical service ? :-?

Carl :grin: