UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
CHAPTER 3
PRE-SITE SAFETY MANAGEMENT
3-1
WORK LOCATION SAFETY REQUIREMENTS. The location and the public
access to the work site impose additional protective or regulatory requirements.
3-1.1
Working Near Energized Circuits. Perform electrical maintenance near
energized circuits with rubber blankets or other suitable guards as a safety measure.
Minor work (such as cutting weeds, taking oil samples, or securing nameplate data)
when done near energized apparatus or conductors located on or near the ground may
be performed when workers maintain at least the qualified worker minimum working
distances or the unqualified worker minimum approach distances, as appropriate.
3-1.1.1 Minimum Approach Distances. Figure 3-1 shows a general layout of the
various approach limits. Each boundary is defined following Figure 3-1.
Figure 3-1. Approach Limits
Any point on
an exposed
energized
electrical
Limited Space
conductor or
circuit part
Restricted Space
Prohibited
Space
Prohibited
Limited
Approach
Approach
Boundary
Boundary
Restricted
Flash
Approach
Protection
Boundary
Boundary
3-1.1.1.1 Flash Protection Boundary. The distance from an arc source (energized
exposed equipment) at which the potential incident heat energy from an arcing fault on
the surface of the skin is 1.2 cal/cm2 (5 J/cm2). Within this boundary, workers are
required to wear personal protective equipment (PPE) clothing, such as flame resistant
shirts and pants and other PPE.
3-1
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