{"data":{"id":"us/30-cfr-28.21","jurisdiction":"us","citation":"30 CFR 28.21","heading":"Certificates of approval; contents.","body":"(a) Each certificate of approval shall contain a description of the fuse and a classification of its current-interrupting capacity and current rating.\n(b) The certificate of approval shall specifically set forth any restrictions or limitations on the use of the fuse in providing short-circuit protection for trailing cables.\n(c) Each certificate of approval shall be accompanied by a reproduction of the approval label or marking design, as appropriate, to be employed by the applicant with each approved fuse as provided in § 28.23.\n(d) No test data or specific laboratory findings will accompany any certificate of approval; however, MSHA will release analyses of pertinent test data and specific findings upon receipt of a written request by the applicant, or when required by statute or regulation.\n(e) Each certificate of approval shall also contain the approved quality control plan as specified in § 28.31.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS","PART 28—FUSES FOR USE WITH DIRECT CURRENT IN PROVIDING SHORT-CIRCUIT PROTECTION FOR TRAILING CABLES IN COAL MINES","Subpart C—Approval and Disapproval"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"5c2ec3a3f5ae7fef8e44f57874c3f7faac1b814c5fa922780cdc7be7925e0fd4","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-28.20","next":"us/30-cfr-28.22"},"notice":"GroundRules: Original legal text. Not legal advice."}