{"id":"emergency-lighting","version":"0.1.0","classification":{"uniformat":"D5090"},"names":["Emergency lighting unit"],"aliases":["battery pack","emergency light"],"service_life":{"median_years":10,"range_years":[5,20],"range_basis":"source_spread"},"pm_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."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["HUD gives planning lives for US multifamily housing; the municipal rows are Ontario accounting lives. Neither is observed replacement data.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-21","canonical_url":"https://unfinished.one/c/emergency-lighting","versioned_url":"https://unfinished.one/c/emergency-lighting/v/0.1.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Emergency lighting unit, v0.1.0. https://unfinished.one/c/emergency-lighting/v/0.1.0"}