6 December 2006
Including change 1, 7 December 2006
3-18.104.22.168 Limited Approach Boundary. A shock protection boundary to be crossed
by only qualified persons (at a distance from a live part) that is not to be crossed by
unqualified persons unless escorted by a qualified person.
3-22.214.171.124 Restricted Approach Boundary. A shock protection boundary to be
crossed by only qualified persons (at a distance from a live part) that, due to its
proximity to a shock hazard, requires the use of shock protection techniques and
equipment when crossed.
3-126.96.36.199 Prohibited Approach Boundary. A shock protection boundary to be
crossed by only qualified persons (at a distance from a live part) that, when crossed by
a body part or object, requires the same protection as if direct contact is made with a
3-1.1.2 Minimum Approach Distance for Unqualified Workers. Only workers
qualified by electrical training can work in areas on or with unguarded, uninsulated
energized lines or parts of equipment operating at 50 volts or more. All electric lines
and equipment will be treated as energized unless deenergized, locked, tagged, and
tested for no voltage. In addition, grounding shall be in accordance with Chapter 7.
The minimum approach distance for an unqualified worker is 10 ft (3 m). The minimum
approach distance refers to the shortest possible distance between energized electrical
lines or apparatus and any part of a worker's body and tools or material being handled.
3-1.1.3 Minimum Working Distances. Table 3-1 lists the minimum working
distances from exposed energized parts within which a qualified worker may not
approach or place any conductive object without an approved insulating handle, unless
certain other live-line work techniques are used (such as isolation, insulation, or
guarding) in accordance with accepted industry practice. Refer to OSHA 29 CFR
1910.269 for voltages higher than 46 kV.