{"data":{"id":"us-va/4vac25-40-920","jurisdiction":"us-va","citation":"4VAC25-40-920","heading":"Electric detonators","body":"A. When electric detonators are used, an acceptable blaster's galvanometer or blaster's multi-meter shall be used to test detonators, firing lines, series circuits, and total circuit resistance prior to firing.\n\nB. Electric detonators of different brands shall not be used in the same blast.\n\nC. Except when being tested with an acceptable instrument:\n\n1. Electric detonators shall be kept shunted until they are connected into the series circuit;\n\n2. Series circuits shall be kept shunted until they are connected onto the firing line; and\n\n3. Firing lines shall be kept shunted until immediately before blasting.\n\nD. Blasting machines or other acceptable power sources shall be suitable for the number of electric detonators to be fired and for the type of circuits to be used.\n\nE. When electric detonators are used, sources of stray current to the blasting area shall be de-energized. Blasting activities shall be stopped immediately if stray current or static electricity in amounts sufficient to cause a premature detonation are encountered.","path":["Title 4. Conservation And Natural Resources","Agency 25. Department of Energy","Chapter 40. Safety and Health Regulations for Mineral Mining","Part VI. Explosives—Surface and Underground"],"source_url":"https://law.lis.virginia.gov/admincode/title4/agency25/chapter40/section920/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:45:55Z","sha256":"f7a63b38d0ccccffea09cc6485214dacf08f0f27cad37cfdb133bcffc212fd05","source_id":"us-va-vac","stale":false,"prev":"us-va/4vac25-40-910","next":"us-va/4vac25-40-925"},"notice":"GroundRules: Original legal text. Not legal advice."}