What is the maximum number of Extended Runtime Modules (ERMs) that can be added to a R12000/3 UPS? 05/20/2017 – by Mod_GuideK 0 What is the maximum number of Extended Runtime Modules (ERMs) that can be added to a R12000/3 UPS? A. 1 B. 2 C. 3 D. 4 SHOW ANSWERSCorrect Answer: D Explanation/Reference: Explanation: Download Printable PDF. VALID exam to help you PASS.