REDUNDANCY LOST Schneider Electric — Wrong A/B Feed Assignment
At a glance
- Severity
- WARNING
- Domain
- TRANSFER_SWITCH_SYSTEM
- Reference standard
- EN 50600-2-2
What it means
Dual-PSU equipment fed from the same chain (or same PDU): the 2N redundancy is lost in the last stretch and a single fault drops the load.
Probable causes
- Later installations ignoring the A/B map
- PDU A and B connected to the same floor board
- Missing or wrong plug labelling
- Load growth never audited
Where to start
Sample or full audit: for every dual-PSU device verify the two plugs land on two different PDUs, themselves on two different chains.
Full guided diagnosis in the app
The diagnostic tree for this fault has 3 guided steps with measurements, checks and resolutions. You'll find it in DataCIQ, one of the five IndexOS apps: free, works offline.
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