Laying cable lines on special structures

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Cable lines up to 220 kV. Laying cable lines on special structures

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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2.3.146. The laying of cable lines on stone, reinforced concrete and metal bridges must be carried out under the pedestrian part of the bridge in channels or in fireproof pipes separate for each cable; measures must be taken to prevent storm water from flowing through these pipes. On metal and reinforced concrete bridges and when approaching them, it is recommended to lay cables in asbestos-cement pipes. In places of transition from bridge structures to the ground, it is recommended to lay cables in asbestos-cement pipes.

All underground cables when passing over metal and reinforced concrete bridges must be electrically insulated from the metal parts of the bridge.

2.3.147. The laying of cable lines on wooden structures (bridges, piers, piers, etc.) must be carried out in steel pipes.

2.3.148. In places where cables pass through expansion joints of bridges and from bridge structures to abutments, measures must be taken to prevent the occurrence of mechanical forces in the cables.

2.3.149. Laying cable lines along dams, dikes, piers and moorings directly in an earthen trench is allowed if the earth layer is at least 1 m thick.

2.3.150. Laying oil-filled cable lines on bridges is not allowed.

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