Annex II of NR10 – Risk Zone and Controlled Area

Table of delimitation radius of free areas, controlled areas and risk zones.

Voltage range

Nominal electrical installation in kV

Rr – Delimitation radius in meter, between risk zone and controlled area

Rc – Delimitation radius in meter,

between controlled area and free area

< 1

≥ 1 e < 3

≥ 3 e < 6

≥ 6 e < 10

≥ 10 e < 15

≥ 15 e < 20

≥ 20 e < 30

≥ 30 e < 36

≥ 36 e < 45

≥ 45 e < 60

≥ 60 e < 70

≥ 70 e < 110

≥ 110 e < 132

≥ 132 e < 150

≥ 150 e < 220

≥ 220 e < 275

≥ 275 e < 380

≥ 380 e < 480

≥ 480 e < 700

0,20

0,22

0,25

0,35

0,38

0,40

0,56

0,58

0,63

0,83

0,90

1,00

1,10

1,20

1,60

1,80

2,50

3,20

5,20

0,70

1,22

1,25

1,35

1,38

1,40

1,56

1,58

1,63

1,83

1,90

2,00

3,10

3,20

3,60

3,80

4,50

5,20

7,20

Figure 1 – Distances in the air radially demarcating the free areas, controlled areas and risk zones.

NR10-Figure1

Figure 2. Distances in the air radially demarcating the free areas, controlled areas and risk zones, with interposition of surfaces of adequate physical separation.

NR10-Figure2
ZL = Free are ZC = Controlled area, restricted to authorized workers ZR = Risk zone, restricted to authorized workers with techniques, tools, equipments appropriate to the task. PE = Point of energized installation SI = Insulating surface constructed with resistant material and endowed with all safety devices.