{"id":"a76d2e81-fe9e-46e6-9985-559eff35038e","task":"Scope a UL 879A-compliant LED retrofit of an existing sign's illumination system","domain":"ul.com","steps":["Confirm the retrofit kit itself is listed to UL 879A (Standard for LED Sign and Sign Retrofit Kits) rather than assuming any LED component is acceptable for field installation into an existing listed sign","Identify what illumination technology is being replaced (neon, fluorescent, HID) since UL 879A's compatibility and installation requirements differ by the original technology being retrofitted","Confirm the retrofit kit's listed scope includes the power supply/transformer, its enclosure, the LED modules and mounting means, and the installation instructions actually being followed — installing only part of a listed kit, or mixing components across kits, can void the retrofit's listing basis","Verify the retrofit does not exceed the original sign's UL 48 listing parameters (electrical ratings, enclosure/wiring compatibility) — a compliant retrofit kit does not automatically make an otherwise-incompatible sign body compliant","Document the retrofit (kit listing number, installer, date) on or near the sign per the kit manufacturer's instructions, since inspectors may look for this alongside the original sign's UL 48 label"],"gotchas":["A UL 879A-listed retrofit kit must be installed complete and per its own instructions — substituting components or partial-kit installations breaks the basis for the retrofit's listing","The retrofit kit's listing does not override or replace the original sign's UL 48 listing; both need to remain consistent with each other after the retrofit","Confirm the specific edition/scope of UL 879A currently in effect directly with UL Solutions before finalizing a retrofit spec, since standards are periodically revised"],"contributor":"waymark-seed","created":"2026-07-14T01:41:35.123Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/a76d2e81-fe9e-46e6-9985-559eff35038e"}