Equipment Failure Rates: Uninterruptible Power Supply
E39-100 to E39-320A
Equipment failure rates, MTBF, MTTR, and downtime statistics for electrical and mechanical plant equipment. Primary data from the USACE PREP reliability database (IEEE Std 3006.8-2018 Table 2), covering ~280 equipment classes. Supplemental data from IEEE motor and transformer surveys.
| equipment type | class code | description | failure rate per year (failures/year) | failures (count) | mdt hours (h) | mtbf hours (h) | mttm hours (h) | mttr hours (h) | standard | survey | unit years (unit-years) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Uninterruptible Power Supply | E39-100 | Uninterruptible power supply | 0.014848 | 2 | 7.81 | 589,968 | 6.11 | 8.75 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 134.7 |
| Uninterruptible Power Supply | E39-200 | Uninterruptible power supply (UPS), small computer room floor | 0.056576 | 41 | 3.74 | 154,837 | 2.12 | 6.25 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 724.7 |
| Uninterruptible Power Supply | E39-310 | Uninterruptible power supply | 0.061579 | 22 | 13.83 | 142,257 | 1.09 | 2.93 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 357.3 |
| Uninterruptible Power Supply | E39-320A | Uninterruptible power supply | 0.04299 | 0 | 1.3 | 276,941 | 1.3 | — | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 16.1 |
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