{"id":"ups","version":"0.1.0","classification":{"uniformat":"D5090"},"names":["Uninterruptible power supply"],"aliases":["UPS"],"service_life":{"median_years":8.33,"range_years":[6.66,10],"range_basis":"source_spread"},"pm_tasks":[],"basis":[{"type":"public_document","life_type":"design","title":"Design standards: employer's requirements – Technical Manual (ER-DFE-XX-XX-T-X-0201, revision A-C01)","by":"Department for Education (England)","url":"https://assets.publishing.service.gov.uk/media/6971f649d8adeaf266040501/ER-DFE-XX-XX-T-X-0201-Technical_Manual-A-C01.pdf","page":275,"code":"5.7.4","label":"UPS: 10 years","years":10,"note":"Printed page 275. Electrical infrastructure section. Section 6.2.4 (p.348) also gives 'UPS device: 10 years' and 'UPS batteries: 5 years' for network equipment. Minimum life expectancy (design requirement) for DfE-funded school buildings. Minimum design requirements placed on contractors for school buildings, not observed replacement ages. Section 5.1.4 (sanitaryware) refers to CIBSE Guide M Appendix 12.A1 'in general'."},{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":47,"code":"COMP","label":"Power supplies (uninterruptable)","years":6.66,"note":"Printed page 47. Computers category. Spelling as printed. Printed DV 30%, SL 21%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/ups","versioned_url":"https://unfinished.one/c/ups/v/0.1.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Uninterruptible power supply, v0.1.0. https://unfinished.one/c/ups/v/0.1.0"}