{"data":{"id":"us/49-cfr-236.552","jurisdiction":"us","citation":"49 CFR 236.552","heading":"Insulation resistance; requirement.","body":"When periodic test prescribed in § 236.588 is performed, insulation resistance between wiring and ground of continuous inductive automatic cab signal system, automatic train control system, or automatic train stop system shall be not less than one megohm, and that of an intermittent inductive automatic train stop system, not less than 250,000 ohms. Insulation resistance values between periodic tests shall be not less than 250,000 ohms for a continuous inductive automatic cab signal system, automatic train control system, or automatic train stop system, and 20,000 ohms for an intermittent inductive automatic train stop system.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES","Subpart E—Automatic Train Stop, Train Control and Cab Signal Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"034e0ae6d501fd56ddd5b2b01ca89b4cdcb8d2539723394d0a42078e7a82cf2b","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.551","next":"us/49-cfr-236.553"},"notice":"GroundRules: Original legal text. Not legal advice."}