External wiring

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

Wiring. External wiring

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

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2.1.75. Unprotected insulated wires of external electrical wiring must be located or fenced in such a way that they are inaccessible to touch from places where people can often stay (for example, a balcony, a porch).

From these places, these wires, laid openly along the walls, must be at a distance of at least, m:

For horizontal laying:
under the balcony, porch, as well as above the roof of an industrial building	2,5
under the window	0,5
under the balcony	1,0
under the window (from the windowsill)	1,0
With vertical laying to the window	0,75
The same, but to the balcony	1,0
From the earth	2,75

When hanging wires on supports near buildings, the distance from the wires to balconies and windows must be at least 1,5 m with a maximum deviation of the wires.

External wiring on the roofs of residential, public buildings and entertainment enterprises is not allowed, with the exception of inputs to buildings (enterprises) and branches to these inputs (see 2.1.79).

Unprotected insulated wires of external wiring should be considered as uninsulated with respect to contact.

2.1.76. Distances from wires crossing fire passages and ways for the transport of goods to the surface of the earth (road) in the carriageway must be at least 6 m, in the impassable part - at least 3,5 m.

2.1.77. The distances between the wires must be: for a span of up to 6 m - not less than 0,1 m, for a span of more than 6 m - not less than 0,15 m. The distances from wires to walls and supporting structures must be at least 50 mm.

2.1.78. Laying of wires and cables of external electrical wiring in pipes, ducts and flexible metal hoses must be carried out in accordance with the requirements given in 2.1.63-2.1.65, and in all cases with a seal. Laying wires in steel pipes and ducts in the ground outside buildings is not allowed.

2.1.79. Entrances to buildings are recommended to be made through walls in insulating pipes in such a way that water cannot accumulate in the passage and penetrate into the building.

The distance from the wires in front of the input and the input wires to the ground surface must be at least 2,75 m (see also 2.4.37 and 2.4.56).

The distance between the wires at the input insulators, as well as from the wires to the protruding parts of the building (roof overhangs, etc.) must be at least 0,2 m.

Entries are allowed to be made through roofs in steel pipes. In this case, the vertical distance from the branch wires to the input and from the input wires to the roof must be at least 2,5 m.

For buildings of low height (shopping pavilions, kiosks, container-type buildings, mobile booths, vans, etc.), on the roofs of which people are excluded, the clear distance from the branch wires to the input and the input wires to the roof is allowed to be taken at least 0,5 .2,75 m. In this case, the distance from the wires to the surface of the earth must be at least XNUMX m.

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

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