{"data":{"id":"us/30-cfr-18.42","jurisdiction":"us","citation":"30 CFR 18.42","heading":"Explosion-proof distribution boxes.","body":"(a) A cable passing through an outside wall(s) of a distribution box shall be conducted either through a packing gland or an interlocked plug and receptacle.\n(b) Short-circuit protection shall be provided for each branch circuit connected to a distribution box. The current-carrying capacity of the specified connector shall be compatible with the automatic circuit-interrupting device.\n(c) Each branch receptacle shall be plainly and permanently marked to indicate its current-carrying capacity and each receptacle shall be such that it will accommodate only an appropriate plug.\n(d) Provision shall be made to relieve mechanical strain on all connectors to distribution boxes.","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 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES","Subpart B—Construction and Design Requirements"],"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":"b9ad40ede3bb0f54a532af13914cd1b9d16a00c2493f2dc16eb74f9f3e81196a","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-18.41","next":"us/30-cfr-18.43"},"notice":"GroundRules: Original legal text. Not legal advice."}