E.P.Z. Grounding
The work practices on this page are merley suggestions and are not to be considered fomalized training.
The manlift and the circuit are grounded to a common grid creating an E.P.Z.
Equal Potential Zone
Grounding
(E.P.Z)
Everything you touch and everything you stand on must be grounded to a common grid or ground reference.
- CLEAR IT !
- TEST IT !
- GROUND IT !
- IF IT’S NOT GROUNDED
- IT’S NOT DEAD
CLEAR IT
TEST IT
GROUND IT
The data listed below is taken from Title 8 of the California Code Of Regulations
These distances shall be maintained until all conductors of the circuit you are getting ready to work on are properly GROUNDED.
Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
Article 36. Work Procedures and Operating Procedures (Formerly Article 85)
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.
ALTERNATING CURRENT–MINIMUM APPROACH DISTANCE
| Nominal Voltage Range
(Phase to Phase) Kilovol |
Minimum Approach Distance
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.
Grounding Powerpoint Presentation
Right Click on the picture above and select “Save Target As” to download a power point presentation on grounding.
This presentation was developed by N.U.T.S.
National Utiltiy Training Systems
This presentation has helpful information on the history of grounding as well as general decriptions on theory and practice.
