Table R-2-Approach Distances to Exposed Energized Overhead Power Lines and Parts
Voltage range (phase to phase, RMS) | Approach distance (inches) |
300 V and less | (1) |
Over 300V, not over 750V | 12 |
Over 750V not over 2 kV | 18 |
Over 2 kV, not over 15 kV | 24 |
Over 15 kV, not over 37 kV | 36 |
Over 37 kV, not over 87.5 kV | 42 |
Over 87.5 kV, not over 121 kV | 48 |
Over 121 kV, not over 140 kV | 54 |
1 Avoid contact.
Gloves, blankets, and other insulating equipment | Natural rubber | Synthetic rubber |
Months | ||
New | 12 | 18 |
Re-issued | 9 | 15 |
Radiation in this area may exceed hazard limitations and special precautions are required. Obtain specific instruction before entering.
Table R-3-Minimum Working Distances From Energized Conductors for Line-Clearance Tree Trimmers and Line-Clearance Tree-Trimmer Trainees
Voltage range (phase to phase) (kilovolts) | Minimum working distance |
2.1 to 15.0 | 2 ft. 0 in. |
15.1 to 35.0 | 2 ft. 4 in. |
35.1 to 46.0 | 2 ft. 6 in. |
46.1 to 72.5 | 3 ft. 0 in. |
72.6 to 121.0 | 3 ft. 4 in. |
138.0 to 145.0 | 3 ft. 6 in. |
161.0 to 169.0 | 3 ft. 8 in. |
230.0 to 242.0 | 5 ft. 0 in. |
345.0 to 362.0 | 7 ft. 0 in. |
500.0 to 552.0 | 11 ft. 0 in. |
700.0 to 765.0 | 15 ft. 0 in. |
Note: A cable sheath may consist of multiple layers of which one or more is conductive.
Note: When any object is said to be insulated, it is understood to be insulated in suitable manner for the conditions to which it is subjected. Otherwise, it is, within the purpose of these rules, uninsulated. Insulating coverings of conductors in one means of making the conductor insulated.
Note: Telecommunication centers are facilities established, equipped and arranged in accordance with engineered plans for the purpose of providing telecommunications service. They may be located on premises owned or leased by the organization providing telecommunication service, or on the premises owned or leased by others. This definition includes switch rooms (whether electromechanical, electronic, or computer controlled), terminal rooms, power rooms, repeater rooms, transmitter and receiver rooms, switchboard operating rooms, cable vaults, and miscellaneous communications equipment rooms. Simulation rooms of telecommunication centers for training or developmental purposes are also included.
29 C.F.R. §1910.268