Section 2. Sewerage of electricity

Overhead power lines with voltage up to 1 kV. Intersections, convergence, joint suspension of overhead lines with communication lines, wire broadcasting and RK

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

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2.4.71. The angle of intersection of the overhead line with the LAN * and LPV should be as close as possible to 90º. For cramped conditions, the intersection angle is not standardized.

According to their purpose, overhead communication lines are divided into long-distance telephone lines (MTS), rural telephone lines (STS), city telephone lines (GTS), wire broadcasting lines (LPV).

In terms of importance, overhead communication lines and wire broadcasting are divided into classes:

• MTS and STS lines: MTS main lines connecting Moscow with republican, regional and regional centers and the latter among themselves, and lines of the Ministry of Railways, passing along railways and across the territory of railway stations (class I); intrazonal MTS lines connecting republican, krai and regional centers with regional centers and the latter among themselves, and STS connecting lines (class II); STS subscriber lines (class III);
• GTS lines are not divided into classes;
• wire broadcasting lines: feeder lines with a rated voltage above 360 ​​V (class I); feeder lines with rated voltage up to 360 V and subscriber lines with voltage 15 and 30 V (class II).

* LAN should be understood as communication lines of the Ministry of Communications of the Russian Federation and other departments, as well as signaling lines of the Ministry of Railways.

LPV should be understood as wire broadcasting lines.

2.4.72. The vertical distance from the wires of the overhead line to the wires or overhead cables of the LAN and LPV in the crossing span with the largest sag of the wire of the overhead line should be:

• from SIP and insulated wires - at least 1 m;
• from bare wires - at least 1,25 m.

2.4.73. The vertical distance from the wires of the overhead line up to 1 kV to the wires or overhead cables of the LS or LPV when crossing on a common support should be:

• between SIP and drugs or LPV - not less than 0,5 m;
• between the uninsulated wire of the overhead line and the LPV - at least 1,5 m.

2.4.74. The intersection of the wires of the overhead line with wires or overhead cables of the LS and LPV in the span should be as close as possible to the overhead line support, but not less than 2 m from it.

2.4.75. The intersection of overhead lines with LS and LPV can be performed according to one of the following options:

1) wires of overhead lines and insulated wires of LS and LPV;

2) wires of overhead lines and underground or overhead cable LS and LPV;

3) wires of overhead lines and uninsulated wires of LS and LPV;

4) underground cable insert in overhead lines with insulated and uninsulated wires LS and LPV.

2.4.76. When crossing overhead lines with insulated wires LS and LPV, the following requirements must be observed:

1) the intersection of the VLI with the LS and LPV can be performed in the span and on the support;

2) the intersection of uninsulated overhead lines with LAN wires, as well as with LPV wires with voltages above 360 ​​V, should be carried out only in the span. The intersection of uninsulated wires of overhead lines with wires of LPV with a voltage of up to 360 V can be performed both in the span and on a common support;

3) overhead line supports that limit the span of intersection with LS of trunk and intrazonal communication networks and connecting lines of STS, as well as LPV with voltage above 360 ​​V, must be of the anchor type. At the intersection of all other LS and LPV, intermediate-type overhead lines are allowed, reinforced with an additional prefix or strut;

4) VL wires should be located above the LS and LPV wires. On the supports that limit the crossing span, uninsulated and insulated wires of overhead lines must be double fastened, the SIP is fixed with anchor clamps. The wires LS and LPV on the supports that limit the crossing span must have a double fastening. In cities and urban-type settlements, newly built HP and LPV are allowed to be placed above the wires of overhead lines with a voltage of up to 1 kV.

2.4.77. When crossing overhead lines with an underground or overhead cable LS and LPV, the following requirements must be met:

1) the distance from the underground part of a metal or reinforced concrete pole and the earthing of a wooden pole to the underground cable of the LS and LPV in a populated area should, as a rule, be at least 3 m. In cramped conditions, it is allowed to reduce these distances to 1 m (subject to the admissibility of interfering influences on LS and LPV); at the same time, the cable must be laid in a steel pipe or covered with a channel or angle steel along the length on both sides of the support at least 3 m;

2) in an uninhabited area, the distance from the underground part or ground electrode of the overhead line support to the underground cable of the LS and LPV must be at least the values ​​\u2.4.5b\uXNUMXbgiven in Table. XNUMX;

3) the wires of the overhead line should, as a rule, be located above the overhead cable of the LS and LPV (see also 2.4.76, clause 4);

4) the connection of the wires of the overhead line in the span of the intersection with the overhead cable LS and LPV is not allowed. The cross section of the SIP carrier core must be at least 35 mm2. VL wires must be multi-wire with a cross section of at least: aluminum - 35 mm2, steel-aluminum - 25 mm2; cross-section of the SIP core with all the carrier conductors of the bundle - at least 25 mm2;

5) the metal sheath of the overhead cable and the rope on which the cable is suspended must be grounded on supports that limit the crossing span;

6) the horizontal distance from the base of the cable support of the LS and LPV to the projection of the nearest wire of the overhead line on the horizontal plane must be at least the maximum height of the support of the crossing span.

Table 2.4.5. The smallest distance from the underground part and the ground electrode of the overhead line support to the underground cable of the LS and LPV in an uninhabited area

2.4.78. When crossing VLI with uninsulated wires LS and LPV, the following requirements must be observed:

1) the intersection of the VLI with the LS and LPV can be performed in the span and on the support;

2) VLI supports, limiting the span of intersection with the LS of the main and intrazonal communication networks and with the connecting lines of the STS, must be of the anchor type. When crossing all other LS and LPV on VLI, it is allowed to use intermediate supports reinforced with an additional prefix or strut;

3) the carrier core of the self-supporting insulated wire or bundle with all carrier conductors at the intersection must have a tensile strength factor at the highest design loads of at least 2,5;

4) VLI wires should be located above the LS and LPV wires. On the supports that limit the crossing span, the supporting wires of the self-supporting insulated wire must be fixed with tension clamps. VLI wires are allowed to be placed under the LPV wires. At the same time, the LPV wires on the supports that limit the crossing span must have a double fastening;

5) the connection of the carrier core and the carrier conductors of the SIP bundle, as well as the LS and LPV wires in the crossing spans is not allowed.

2.4.79. When crossing insulated and uninsulated wires of overhead lines with uninsulated wires of LS and LPV, the following requirements must be observed:

1) the intersection of the wires of the overhead line with the wires of the LAN, as well as the wires of the LPV with a voltage above 360 ​​V, should be carried out only in the span.

The intersection of wires of overhead lines with subscriber and feeder lines of LPV with a voltage of up to 360 V is allowed to be carried out on overhead line supports;

2) VL supports limiting the crossing span must be of the anchor type;

3) LS wires, both steel and non-ferrous, must have a tensile strength factor at the highest design loads of at least 2,2;

4) VL wires should be located above the LS and LPV wires. On the supports that limit the crossing span, the wires of the overhead line must have a double fastening. Wires of overhead lines with a voltage of 380/220 V and below are allowed to be placed under the wires of the LPV and GTS lines. At the same time, the wires of the LPV and the GTS lines on the supports that limit the crossing span must have a double fastening;

5) connection of wires of overhead lines, as well as wires of LS and LPV in crossing spans is not allowed. VL wires must be multi-wire with sections not less than: aluminum - 35 mm2, steel-aluminum - 25 mm2.

2.4.80. When crossing an underground cable insert in an overhead line with uninsulated and insulated wires LS and LPV, the following requirements must be observed:

1) the distance from the underground cable insert in the overhead line to the LS and LPV support and its ground electrode must be at least 1 m, and when laying the cable in an insulating pipe - at least 0,5 m;

2) the horizontal distance from the base of the overhead line cable support to the projection of the nearest LS and LPV wire on the horizontal plane must be at least the maximum height of the crossing span support.

2.4.81. The horizontal distance between the VLI wires and the LS and LPV wires during parallel passage or approach must be at least 1 m.

When approaching overhead lines with air LS and LPV, the horizontal distance between the insulated and uninsulated wires of the overhead line and the wires of the LS and LPV must be at least 2 m. In cramped conditions, this distance can be reduced to 1,5 m. In all other cases, the distance between the lines should be not less than the height of the highest support of the overhead line, LS and LPV.

When approaching overhead lines with underground or overhead cables LS and LPV, the distances between them should be taken in accordance with 2.4.77, paragraphs 1 and 5.

2.4.82. The proximity of overhead lines with antenna structures of transmitting radio centers, receiving radio centers, dedicated receiving points for wire broadcasting and local radio nodes is not standardized.

2.4.83. The wires from the overhead line support to the entrance to the building should not intersect with the branch wires from the LS and LPV, and they should be located at the same level or above the LS and LPV. The horizontal distance between the wires of the overhead line and the wires of the LS and LPV, television cables and descents from radio antennas at the inputs must be at least 0,5 m for SIP and 1,5 m for uninsulated wires of overhead lines.

2.4.84. Joint suspension of the overhead cable of rural telephone communication and VLI is allowed if the following requirements are met:

1) the zero core of the SIP must be insulated;

2) the distance from the SIP to the STS overhead cable in the span and on the VLI support must be at least 0,5 m;

3) each VLI support must have a grounding device, while the grounding resistance should be no more than 10 ohms;

4) on each VLI support, the PEN conductor must be re-grounded;

5) the carrying rope of the telephone cable, together with the metal mesh outer cover of the cable, must be connected to the grounding conductor of each support by a separate independent conductor (descent).

2.4.85. Joint suspension on common supports of uninsulated wires of overhead lines, LS and LPV is not allowed.

Joint suspension of uninsulated wires of overhead lines and insulated wires of LPV is allowed on common supports. In this case, the following conditions must be met:

1) the rated voltage of the overhead line should be no more than 380 V;

2) the rated voltage of the LPV should be no more than 360 V;

3) the distance from the lower LPV wires to the ground, between the LPV circuits and their wires must comply with the requirements of the current rules of the Ministry of Communications of Russia;

4) uninsulated wires of overhead lines should be located above the wires of the LPV; at the same time, the vertical distance from the lower wire of the overhead line to the upper wire of the LPV should be at least 1,5 m on the support, and at least 1,25 m in the span; when the LPV wires are located on the brackets, this distance is taken from the lower wire of the overhead line, located on the same side as the LPV wires.

2.4.86. Joint suspension of SIP VLI with uninsulated or insulated wires LS and LPV is allowed on common supports. In this case, the following conditions must be met:

1) the rated voltage of the VLI should be no more than 380 V;

2) the rated voltage of the LPV should be no more than 360 V;

3) the rated voltage of the LAN, the calculated mechanical stress in the wires of the LAN, the distance from the lower wires of the LAN and LPV to the ground, between the circuits and their wires must comply with the requirements of the current rules of the Ministry of Communications of Russia;

4) VLI wires up to 1 kV should be located above the LS and LPV wires; at the same time, the vertical distance from the SIP to the upper wire of the LS and LPV, regardless of their relative position, must be at least 0,5 m on the support and in the span. Wires VLI and LS and LPV are recommended to be placed on different sides of the support.

2.4.87. Joint suspension on common supports of uninsulated wires of overhead lines and LAN cables is not allowed. Joint suspension on common supports of wires of overhead lines with a voltage of not more than 380 V and cables of LPV is allowed subject to the conditions specified in 2.4.85.

The optical fibers of the JCLN shall comply with the requirements of 2.5.192 and 2.5.193.

2.4.88. Joint suspension on common supports of wires of overhead lines with a voltage of not more than 380 V and telemechanics wires is allowed subject to the requirements given in 2.4.85 and 2.4.86, and also if telemechanics circuits are not used as wired telephone communication channels.

2.4.89. On the supports of VL (VLI) it is allowed to suspend fiber-optic communication cables (OK):

• non-metallic self-supporting (OKSN);
• non-metallic, wound on a phase wire or a bundle of self-supporting insulated wire (OKNN).

Mechanical calculations of VL (VLI) supports with OKSN and OKNN should be made for the initial conditions specified in 2.4.11 and 2.4.12.

The overhead line supports on which the OK is suspended, and their fixing in the ground, must be calculated taking into account the additional loads that arise in this case.

The distance from OKSN to the ground surface in populated and uninhabited areas should be at least 5 m.

The distances between the wires of overhead lines up to 1 kV and OKSN on the support and in the span must be at least 0,4 m.

See other articles Section Rules for the installation of electrical installations (PUE).

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