connection of the concentric neutral to other cables must be eliminated, such as bare concentric neutrals lying on, or in contact with other cables. Note: Due to the conductivity of the soil and semiconductor surrounding the neutral, achieving true isolation from other circuits cannot be relied on, EPZ and insulation methods provide the best protection practices. The ground mat, when properly installed, can be used to create an EPZ for underground cable work, the same way a cluster bar on overhead structures creates an EPZ that extends below the worker’s feet. Personal Protective Grounding Procedures Manual—PolicyTech—Safety—11/14/19. The most current version of this document is posted to Rocky Mountain Power T&D Safety pages on the intranet and to PolicyTech. Printed versions of this document may be out of date. Modification of this document must be approved by the Joint Grounding Committee. Page 50 of 50
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