{"id":"emergency-lighting","version":"0.3.0","classification":{"uniformat":"D5090"},"names":["Emergency lighting unit"],"aliases":["battery pack","emergency light"],"service_life":{"median_years":15,"range_years":[5,25],"range_basis":"source_spread"},"pm_tasks":[{"task":"Run battery emergency lights at least 90 minutes","frequency":"P1Y","reference":"UFC 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (7 October 2021, with Change 1, 18 April 2025)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufc_3_601_02_2021_c1.pdf","page":85,"checklist":"Table 2-27 Emergency Lighting System ITM Tasks"}],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":15,"code":"HUD CNA 3.6.2.6","label":"Emergency lights, illuminated signs","years":[5,10],"note":"Family properties 5 years, elderly 10. US multifamily housing."},{"type":"public_document","life_type":"accounting","title":"Meaford: By-law 2020-83, Tangible Capital Asset Policy, Appendix A Estimated Useful Lives","url":"https://meaford.civicweb.net/document/103944/","page":17,"label":"Electrical - Emergency Lighting","years":20,"note":"Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page."},{"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":294,"code":"5.8.4","label":"Internal luminaires, emergency lighting fittings and lighting controls: 25 years","years":25,"note":"Printed page 294. Interior LED luminaires (LED required, p.302) and emergency lighting fittings; batteries dealt with separately (5.8.15). 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'."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/emergency-lighting","versioned_url":"https://unfinished.one/c/emergency-lighting/v/0.3.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Emergency lighting unit, v0.3.0. https://unfinished.one/c/emergency-lighting/v/0.3.0"}