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Page Title:
Table 5-4. Minimum safe distances between mobile RF transmitters and electric blasting operations |
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|  DOE-HDBK-1092-2004
Table 5-4. Minimum safe distances between
mobile RF transmitters and electric blasting operations.
Minimum safe distances (ft)
Transmitter power
MF b
HF b
VHF(1) b
VHF(2) b, c
UHF b
(watts)
5c
-
-
-
-
-
10
40
100
40
15
10
50
90
220
90
35
20
100
125
310
130
50
30
180 d
-
-
-
65
40
250
200
490
205
75
45
500 e
-
-
209
-
-
600 f
300
760
315
115
70
1,000 g
400
980
410
150
90
10,000 h
1,200
-
1,300
-
-
b
MF
1.6 to 3.4 MHz
Industrial
HF
28 to 29.7 MHz
Amateur
VHF(1)
35 to 44 MHz
Public use
50 to 54 MHz
Amateur
VHF(2)
144 to 148 MHz
Amateur
150.8 to 161.6 MHz
Public use
UHF
450 to 460 MHz
Public use
c
Citizens band radio (walkie-talkie), 26.96 to 27.23 MHz and cellular telephones, 3 watts power, 845
MHz; minimum safe distance; 5 ft.
d
Maximum power for 2-way mobile units in VHF, 15.08- to 161.6-MHz range, and for 2-way mobile and
fixed station units in UHF, 450- to 460-MHz range.
e
Maximum power for major VHF 2-way mobile and fixed-station units in 35- to 44-MHz range.
f
Maximum power for 2-way fixed-station units in VHF, 150.8- to 161.6-MHz range.
g
Maximum power for amateur radio mobile units.
h
Maximum power for some base stations in 42- to 44-MHz band, 1.6- to 1.8- MHz band.
3. The entire wiring system of the explosive charge and of any low-firing-current initiators shall be
kept insulated at all times from every possible source of extraneous current. Shunts shall be left
on all low-energy initiators or lead wires until actual connections are to be made. Connections
shall be taped or otherwise insulated.
4. Test unit low-firing-current actuators or detonators shall be clearly marked. No contact
operations involving electrical testing shall be permitted on this type of unit unless an electric
meter for the specific application is used.
5-10
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