Arc Flash Report | Interstates

Lengths for Limited Approach, and Restricted Approach reference NFPA 70E-2021, Table 130.4(E)(a), which is shown below.

(All dimensions are distance from energized electrical conductors or circuit part to employee)

Limited Approach Boundary

Nominal System Voltage Range, Phase to Phase

Exposed Movable Conductor

Exposed Fixed Circuit Part

Restricted Approach Boundary; Includes Inadvertent Movement Adder

0 to 50

Not Specified

Not Specified Avoid Contact

51 to 150

10 ft 0 in. 10 ft 0 in. 10 ft 0 in. 10 ft 0 in. 10 ft 0 in. 10 ft 0 in. 10 ft 8 in. 11 ft 0 in. 11 ft 8 in. 13 ft 0 in. 15 ft 4 in. 19 ft 0 in. 23 ft 9 in.

3 ft 6 in. 3 ft 6 in. 5 ft 0 in. 6 ft 0 in. 8 ft 0 in. 8 ft 0 in. 8 ft 0 in. 10 ft 0 in. 11 ft 8 in. 13 ft 0 in. 15 ft 4 in. 19 ft 0 in. 23 ft 9 in.

151 to 750

1ft 0 in.

751 to 15kV

2 ft 2 in. 2 ft 9 in. 2 ft 9 in. 3 ft 6 in. 3 ft 6 in. 3 ft 10 in. 4 ft 3 in. 5 ft 8 in.

15.1 kV to 36 kV 36.1 kV to 46 kV 46.1 kV to 72.5 kV 72.6 kV to 121 kV 138 kV to 145 kV 161 kV to 169 kV 230 kV to 242 kV 345 kV to 362 kV 500 kV to 550 kV 765 kV to 800 kV

9 ft 2 in.

11 ft 8 in.

15 ft 11 in.

SITE NAME ARC FLASH STUDY

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INTERSTATES DATE