Extraneous electricity. Precautions

Due precautions shall be taken to prevent accidental discharge of electric blasting caps from current induced by radar, radio transmitters, adjacent power lines, lightning, dust storms and other sources of extraneous electricity. The precautions shall include: (a) The suspension of all blasting operations regardless of the method of initiation and removal of persons from the blasting area during the approach and progress of an electric storm. (b) Special precautions may be required by the State Fire Marshal when blasting operations are conducted in a radar environment. (c) Electric blasting shall not be carried out at lesser distances from radio transmitter antennas than is set forth in the following table: Distances for AM Transmitters (Fixed or Mobile) Transmitter Power in Watts Minimum Distance in Feet 5 — 25 100 25 — 50 150 50 — 100 220 100 — 250 350 250 — 500 450 500 — 1,000 650 1,000 — 2,500 1,000 2,500 — 5,000 1,500 5,000 — 10,000 2,200 10,000 — 25,000 3,500 25,000 — 50,000 5,000 50,000 — 100,000 7,000 Distances for FM Mobile Transmitters Transmitter Power in Watts Minimum Distance in Feet 1 — 10 5 10 — 30 10 30 — 60 15 60 — 250 30 250 — 600 45 Where the power of an FM or TV transmitter exceeds 100,000 watts, electric blasting shall be conducted at a distance of at least 600 feet or more. No electric blasting will be carried out at lesser distances than in the aforesaid tables without the specific permission of the State Fire Marshal.