795 قنوات تحت الأرضية

795 UNDERFLOOR DUCTS

795-1 The installation of under floor ducts shall be permitted beneath the surface of concrete or other
flooring material.

795-2 Under floor ducts shall not be installed at locations which are regularly wa shed or where they are
subject to corrosive vapours. In hazardous locations under floor ducts shall not be employed.

795-3 Unless adequate protection against corrosion is provided, metal under floor ducts, junction boxes and
fittings shall not be installed in concrete. Metallic and non-metallic under floor ducts shall be of substantial
construction.

795-4 All under floor ducts shall be laid in straight lines and junction boxes shall be installed at all changes
in direction. All junction boxes shall be levelled to the floor. Dead ends of all ducts shall be closed.


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795-5 Under floor ducts shall be provided with tap off position for outlets at regular spacing.

795-6 Throughout the under floor duct system joints in conductors shall not be employed.

795-7 The combined cross sectional area of all conductor s installed within the duct shall not exceed 40
percent of the interior cross sectional area of the duct or the duct size shall be selected in accordance with the
method detailed in Section 15.

795-8 Where under floor ducts serve more than one service as telephones, intercoms, etc. in addition to
socket outlets, multi -sectioned ducts sha ll be provided and each service shall be housed in a separate duct.
Outlet boxes serving different services and installed within the same box sha ll be provided with suitable
separators.






































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