A/B power feeds and redundant power supplies
Trace power paths, spot servers that only look redundant, and check capacity before you add load.
- Level
- Intermediate
- Length
- About 35 minutes
- Contents
- 3 lessons · 1 video · final exam
- Status
- Published · updated 1 Oct 2026
Skills you'll practise
- Trace a server's power from each PSU back to its feed
- Identify configurations that aren't really redundant
- Calculate the load a single feed must carry if the other fails
Course outline
- 1.A and B power, done properlyVideo · 2 min
- 2.What real A/B redundancy looks likeLesson · 12 min
- 3.Tracing and labeling power cordsLesson · 12 min
- 4.Power-supply redundancy modes and PSU alarmsLesson · 12 min
- 5.A/B power feeds and redundant power supplies: knowledge checkKnowledge check · 18 questions
- 6.A server lost one power supplyScenario
- 7.Final exam4 questions · passing it completes the course, so people who already know the material can test out
Sources it draws on
The lessons and questions are written from these references, so learners can go back to the original.
- ANSI/TIA-942: Telecommunications infrastructure standard for data centers
- Your equipment vendors' installation and service guides (rail kits, PSU and BMC documentation)
- General data-center operations practice
See it with your own jobs and topics
Tell us about your team and we'll walk you through setup, from choosing jobs to your first skills check.