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.

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

CLEAR IT

TEST IT

TEST IT

GROUND 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 152 ft. 1 in
Above 15 to 362 ft. 4 in
Above 36 to 462 ft. 7 in
Above 46 to 72.53 ft. 0 in.
Above 72.5 to 1213 ft. 4 in.
Above 121 to 1453 ft. 7 in.
Above 145 to 1694 ft. 0 in.
Above 169 to 2425 ft. 3 in.
Above 242 to 3628 ft. 6 in.
Above 362 to 55211 ft. 3 in.
Above 552 to 76515 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.

 

 

 

 

 

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