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Minimum Clear Working Space

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The following table from the National Electric Code provides minimum depth of clear working space in front of electrical equipment:

Nominal Voltage to

Conditions

Ground

i

ii

iii

(ft)

(ft)

(ft)

601 - 2,500 volts

3

4

5

2,501 - 9,000 volts

4

5

6

9,001 - 25,000 volts

5

6

9

25,001 - 75 kV

6

8

10

Above 75 kV

8

10

12

Where conditions (i), (ii), and (iii) are as follows:

(i) Exposed live parts on one side and no live or grounded parts on the other side of the working space, or exposed live parts on both sides effectively guarded by suitable wood or other insulating materials. Insulated wire or insulated bus bars operating at not over 300 volts shall not be considered live parts.

(ii) Exposed live parts on one side and grounded parts on the other side. Concrete,

brick, or tile walls will be considered as grounded surfaces.

(iii) Exposed live parts on both sides of the workspace [not guarded as provided in condition (i)] with the operator between.