Mike Dolt Enterprises
Mike Dolt Enterprises
User: bsisco, Location: Fl
Asked on: Friday, March 25, 2011 at 7:10 am EDT
Answered on: Tuesday, May 14, 2024 at 3:15 am EDT
Question: The sample problems on page 264 of this guide are not applying the additional 1.25 (690.8.(B)(1)). I believe the calculation should be :Module Isc X 1.25 X 1.25 (as specified on page 262)But the sample problems are calculating max current as : Module Isc x 1.25I thought I understood this and am I taking the NABCEP test tomorrow. Can anyone confirm that the sample problems are wrong?Thanks
Yes, the sample problems on page 264 of that guide are incorrect. The correct calculation for maximum current should be
Module Isc x 1.25 x 1.25
This is because NEC 690.8(B)(1) requires that the maximum current rating of the system components be multiplied by 1.25, and NEC 690.8(B)(2) requires that the overcurrent protection devices be rated at not more than 125% of the conductor ampacity.Please note that this correction is only applicable to the sample problems on page 264. The rest of the guide is correct.Good luck on your NABCEP test tomorrow! Flag for review