Installation of external electrical wiring. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Installation of external electrical wiring. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

Under outdoor understand electrical wiring that is laid along the outer walls of buildings, between them on supports (no more than four spans up to 25 m each), etc.

External wiring can be open and hidden. External wiring must be inaccessible to accidental contact or fenced. Unprotected insulated wires of external electrical wiring should be considered as uninsulated (bare) in relation to touching them.

Indoor networks should be made with insulated wires, while the distance from them to the ground should be at least 2,75 m.

Unprotected insulated wires of external electrical wiring must be located or fenced off so that they cannot be touched by people and animals.

Wires laid openly along the walls must be at a distance of at least:

for horizontal laying:

above the porch 2,5 m
above the window 0,5 m
under the window (from the window sill) 1,0 m

for vertical laying:

up to the window 0,75 m
from the ground 2,75 m

Shielded wires and cables are not subject to these restrictions.

When performing external electrical wiring on supports near the building, the distance from the wires to the window must be at least 1,5 m with a maximum deviation of the wires. In cases where the above safety distances cannot be maintained, the wires must be securely protected from touch.

Above the carriageway, the wires must be suspended at a height of at least 6 m from the surface of the earth (road), and above the impassable, footpaths - at least 3,5 m.

The distance between the wires must be: for a span of up to 6 m - at least 0,1 m; with a span of more than 6 m - not less than 0,15 m.

Insulated wires along the walls of the house are laid on insulators or in pipes, and under sheds, where rain or snow does not get on them, - on PC-type rollers specially designed for this purpose. The wire suspension height must be at least 2,75 m from the ground. The distance between the points of attachment of wires to insulators installed on the walls should not exceed 2 m.

Laying of wires and cables of external electrical wiring in pipes and flexible metal hoses must be carried out in accordance with the requirements set forth in the section "Installation of electrical wiring in pipes" (note!) in all cases - with a seal.

Laying wires in steel pipes in the ground outside the building is not allowed.

To prevent damage to the wires when throwing snow from the roof of the house, it is better to place the wires not in a horizontal, but in a vertical plane, one above the other. In this case, the distance from the wires to the protruding part of the building must be at least 0,2 m.

The crossing of wires with drainpipes and other obstacles is carried out in a steel pipe or hidden in a furrow in the wall. At the ends of the passage (bypass), porcelain funnels are installed on both sides with the socket down and filled with insulating mastic.

When installing external electrical wiring on the territory of the garden plot, special attention must be paid to excluding the possibility of contact between wires and tree crowns.

It is not allowed to lay external electrical wiring on the roofs of houses.

Author: Bannikov E.A.

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