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State of Tamilnadu - Section

Section 7 in The Special Rules for the Mulit-storeyed and Public Buildings, 1974

7. Means of access and circulation.

(1)
(a)There shall be provided from the street a clear way of not less than 5 meters in width separately for entrance and for exit, as a means of access to and from the building or buildings within the site, provided that where a site does not abut on a street the means of access to the site shall not be less than 12 meters from an existing public street.
(b)The access way so provided, shall be maintained free from any obstruction or overhang or projection from the building below a height of 3 meters from the level of such access way.
(c)The space so set apart as means of access shall be separately distinguished from any house gully or open space for amenity requirement prescribed under these rules.
(d)Every such means of access shall be made drained and lighted to the satisfaction of the Commissioner and manhole covers or other drainage, water supply or any other fittings laid in such means of access shall be flush with the finished surface level so as not to obstruct the travel over the same.
(e)Any person who undertakes any construction, reconstruction, addition or alteration to any building shall not reduce the access to any building previously existing below the minimum width prescribed under these rules.
(2)
(a)Every building meant for human occupation shall be provided with exits sufficient to permit safe escape of occupants in case of fire or other emergency.
(b)An exit may be a doorway, corridor, passage way to an internal staircase or external staircase or to a varandah or roofs or terrace having access to the street or a staircase.
Explanation. - Lifts and escalators shall not be considered as exits.
(c)Exits shall be arranged as to provide continuous means of egress to the exterior of a building or an exterior open space leading to a street, without passing through any occupied unit.
(d)Exits shall be so located that the travel distance on the floor shall not exceed 22 meters in the case of residential and public buildings and 30 meters in the case of commercial, industrial and other buildings. There shall be at least two exits serving every floor and at least one of them shall lead to the staircase.
Explanation. - Travel distance means the distance from any point of one floor area to any exit measured along the path of egress travel except that when floor areas are sub divided into rooms used singly or number of rooms and served by corridors or passages, the travel distance to be measured from the corridor entrance of such rooms or suits to the nearest staircase or varandah having access to the street.
(e)Width of any exit shall not be less than 100 cm. and shall be determined for the total number of occupants as specified in the following table. The unit of exit width for measuring the capacity of exits shall be 25 cms. A clear width of 25 cm. shall be counted as an additional half and any width less than 25 cm. shall not be counted for calculating width :-
S. No. Type of Occupancy No. of occupants per unit size width
Stair case Doors
(1) (2) (3) (4)
1 Residential 25 75
2 Mixed and other uses including buildingspermitted in special areas notified. 50 75