Mich. Admin. Code R. 408.15321 - Electrical hazards
Rule 5321.
(1)
An electric conductor or communication line shall be considered energized
unless the systems utility or owner indicates otherwise and they have visibly
grounded the conductor or line.
(2)
The location of underground utilities shall be determined before any digging or
ditching operations are started.
(3) A tree worker or qualified line clearance
tree trimmer shall not make a direct contact with an energized
conductor.
(4) A tree worker shall
maintain his body and tools not less than the distance prescribed in table 1
from an energized conductor. If these clearances cannot be maintained, the
systems operator or owner shall be contacted to deenergize the conductor or
provide protective measures or devices before the work is started.
(5) A qualified line clearance tree trimmer
shall maintain his body and tools not less than the distance prescribed in
table 2 from an energized conductor, except the trimmer may remove branches
hanging on a conductor using approved insulated tools and equipment when the
voltage is below 10 kv.
(6) A
branch hanging on a conductor energized at more than 10 kv shall be removed
after the line is deenergized or removed by an authorized and trained systems
operator employee or owner employee using approved protective tools and
equipment.
TABLE 1
Minimum Working Distances for Tree Workers
Voltage | Minimum Distance |
0 to 300 volts | 1 foot (.305 M) |
301 to 750 volts | 2 feet (.610 M) |
751 to 50 kv | 10 feet (3.05 M) |
50 kv or more | .4 inch per 100 volts |
TABLE 2
Minimum Working Distances for Qualified Line Clearance Tree Trimmers
Voltage Range (phase to phase) | Minimum Working Distance |
O to 750 v | 1 ft. ( .305 M) |
751 to 35 kv | 2 ft. 4 in. ( .711 M) |
35.1 kv to 46.0 kv | 2 ft. 6 in. ( .762 M) |
46.1 kv to 72.5 kv | 3 ft. 0 in. ( .914 M) |
72.6 kv to 121.0 kv | 3 ft. 4 in. (1.016 M) |
138.0 kv to 145.0 kv | 3 ft. 6 in. (1.067 M) |
161.0 kv to 169.0 kv | 3 ft. 8 in. (1.118 M) |
230.0 kv to 242.0 kv | 5 ft. 0 in. (1.524 M) |
345.0 kv to 362.0 kv | 7 ft. 0 in. (2.134 M) |
500.0 kv to 552.0 kv | 11 ft. 0 in. (3.453 M) |
700.0 kv to 765.0 kv | 15 ft. 0 in. (4.572 M) |
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.