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Subchapter 5. Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
Article 36. Work Procedures and Operating Procedures (Formerly Article 85)

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§2940.2. Clearances.

(a) No employee shall be permitted to approach or take any conductive object without an approved insulating handle closer to exposed energized parts than shown in Table 2940.2 unless:

(1) The employee is insulated or guarded from the energized part (gloves or gloves with sleeves rated for the voltage involved shall be considered insulation of the employee from the energized part), or

(2) The energized part is insulated or guarded from the employee and any other conductive object at a different potential.

(b) When performing work with live line tools, minimum clear distances in Table 2940.2 shall be maintained. Conductor support tools, such as link sticks, strain carriers, and insulator cradles, shall be permitted to be used provided that the clear insulation is at least as long as the insulator string or the minimum distance specified in Table 2940.2 for the operating voltage.


 TABLE 2940.2 
ALTERNATING CURRENT--MINIMUM APPROACH DISTANCE
Nominal Voltage Range (Phase to Phase) Minimum Approach Distance Kilovolt Phase to Ground Exposure Above 0.6 to 15.................... 2 ft. 1 in. Above 15 to 36.................... 2 ft. 4 in. Above 36 to 46.................... 2 ft. 7 in. Above 46 to 72.5.................... 3 ft. 0 in. Above 72.5 to 121.................... 3 ft. 4 in. Above 121 to 145.....................3 ft. 7 in. Above 145 to 169.................... 4 ft. 0 in. Above 169 to 242.................... 5 ft. 3 in. Above 242 to 362.................... 8 ft. 6 in. Above 362 to 552................... 11 ft. 3 in. Above 552 to 765................... 15 ft. 0 in.
Note: Above 242 KV the minimum working distance and the minimum approach distance shall be permitted to be reduced provided that such distances are not less than the shortest distance between the energized part and a grounded surface.

TABLE 2940.2-2
DC LIVE-LINE WORK MINIMUM
APPROACH DISTANCE
WITH OVERVOLTAGE FACTOR

 

Maximum anticipated
per-unit transient
overvoltage

Distance in feet-inches
Maximum line-to-ground
voltage in kilovolts
250
400
500
600
750

1.5 or lower
3-8
5-3
6-9
8-7
11-10

1.6

3-10
5-7
7-4
9-5
13-1
1.7
4-1
6-0
7-11
10-3
14-4
1.8
4-3
6-5
8-7
11-2
15-9

NOTE 1: The distances specified in this table may be applied only where the maximum anticipated per-unit transient overvoltage has been determined by engineering analysis and has been supplied by the employer. However, if the transient overvoltage factor is not known, a factor of 1.8 shall be assumed.

NOTE 2: The distances specified in this table are the air, bare-hand, and live-line tool distances.

NOTE

Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

HISTORY

1. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).

2. Amendment of subsection (b) and Table filed 12-12-94; operative 1-11-95 (Register 94, No. 50).

3. Editorial correction of Table (Register 95, No. 32).

4. Amendment of subsection (a)(1), table and table note filed 11-25-97; operative 12-25-97 (Register 97, No. 48).

5. Amendment filed 7-26-2000; operative 8-25-2000 (Register 2000, No. 30).

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