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#575 - 05/12/02 07:47 PM NEC 110-9 Interrupting Rating
Kevin Arnold Offline
Apprentice Member

Registered: 05/14/01
Posts: 8
Loc: Tampa, FL, USA
I am wondering if local jurisdiction is enforcing 110-9? Reason for the concern is that some local jurisdictions are not requiring to have the available short circuit current listed on the blue prints by the consulting engineer who stamps his/her PE seal on the prints. I have seen a couple of instances recently where the main switchboard called out for a 65kAIC. However, the utility contribution and generator/motor contribution exceeded this amount. The engineer did not have the available short circuit on the print. If the available short circuit is not determined in the planning and design stage, then how does the engineer know how much Interrupting Rating to specify on the Overcurrent Protective Device? I would like to hear back from the different jurisdictions across thes state on this topic as well as any contractor or engineer. Thank you for your anticipated comments and/or suggestions.

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#576 - 05/13/02 02:58 PM Re: NEC 110-9 Interrupting Rating
Nick Sasso Offline

Post-A-Holic Member
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Registered: 11/08/01
Posts: 1451
Loc: West Palm Beach
**The designing engineer must design the system in accordance with Chapter 61G15-33, Florida Administrative Code, specifically 61G15-33.003 "Design of Power Systems." Short circuit analysis is one of the minimum requirements for the design. This is all fine and dandy provided that the plans do require an engineer's seal. Under Florida Statutes, an engineering seal is only required when there is an aggregate service capacity of 800 amps or more (commercial), and 600 amps or more (residential).
**It is entirely possible that some plans may squeak through plan review without providing short circuit characteristics, however, this would not alleviate the electrical inspector from performing his job and inspecting for National Electrical Code requirements at the time of his inspection. In Pasco County, FL, when an inspector is in doubt, it is not uncommon that he require a letter from the power company prior to releasing any power. If they fall below the mark, the contractor then has to change out the breaker and/or service equipment. Of course, careful planning by the designer (architect or engineer if there is one) and the electrical contractor, would avoid this from happening.
**If you're in the question: "if the AHJ missed it on plan review - is the contractor still required to build it to code," the answer is YES. Also remember, it is not the AHJ's responsibility to design the system. That's my take on it anyway. smile Any other thoughts or opinions??
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