Please note: The NABCEP 2018 and 2019 PV Installation Professional Exams are based on the 2017 NEC. Beginning January 1, 2019, NABCEP will discontinue offering the Certification Exams in Paper-&-Pencil (P&P) format. Accepted Candidates for the NABCEP PV Installation Professional, PV Design Specialist, PV Installer Specialist and PV Commissioning & Maintenance Specialist Certification Exams may choose a time and location to take their Exam by computer through our Computer-Based Testing (CBT) network, Castle Worldwide, Inc. Accepted Candidates will receive a Notice-to-Schedule (NTS) email from Castle with instructions on how to select a location, date, and time for their exam. All Candidates must submit scheduling requests to Castle at least four (4) business days prior to the date the Candidate wishes to take or reschedule their exam.