MIL-HDBK-1025/10
Table 11A
Limits of Approach
Safe Working Procedures
Flash Protection
Prohibited
Boundary
Any point on an
1. PROHIBITED approach that allows
Approach
exposed
Boundary
energized
for space between the worker and
electrical
Limited Space
the live equipment large enough to
conductor or
Restricted Space
circuit part
prevent flashover, due to disturbance
Prohibited
of electrical fields.
Space
2. RESTRICTED approach between
Prohibited
the worker and the live conductor
Space
that provides space to allow for
Restricted Space
inadvertent action or reflex jerk
Restricted
Limited Space
Limited
Approach
movement of the body.
Approach
Boundary
3. LIMITED approach with space for
Boundary
qualified workers to position.
Flash Protection
4. FLASH PROTECTION
Boundary
BOUNDARY approach distance
beyond which flash protection
(flame-resistant clothing) is required.
These boundaries are all created for the
qualified worker. It also defines flash
protection boundary.
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