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Legend: Explanations & Illustrations Rationale Note Figures & Tables Revision history

3.16 USE OF PLASTIC MATERIAL

Use of plastic material shall be in accordance with the Code of Practice for Fire Precautions in Buildings, except where herein modified in this Code.

Compartmentation of additional commercial spaces made up of a group of shops

3.2.4c

Compartmentation of commercial spaces at the ground level of station entrance

Diagram 3.2.4c.: Compartmentation of Commercial Spaces

3.3.2c

Fire resistance of elements of structure around the trainway in an aboveground station where there are habitable floors directly above the trainway.

Note: All elements of structure shall not be less than 4 hrs fire rating.

Diagram 3.3.2c.: Cross-Section of Trainway

3.5.2d

Separation distance “X” between the external wall of a ground level entrance (with no habitable room) and the external wall of an adjacent building.

Diagram 3.5.2d.: Distance between Existing Building and New Station Entrance

TABLE 3.2A: SIZE LIMITATION OF STATION AND COMPARTMENT
CompartmentsMaximum Floor AreaMaximum Cubical Extent
(2)(3)
Compartment below ground level. No compartment to comprise more than one storey*.2000m27500m3
Compartments between average ground level and a height of 24m. No compartment to comprise more than 3 storeys.4000m215000m3
Compartments above a height of 24m from average ground level. No compartment to comprise more than one storey.2000m27500m3

Note:

* = Size limitation of compartment below ground level is not applicable to the public area. Public area below ground level shall comply with Cl.3.2.4e.

TABLE 3.4A: SPECIFIC PROVISIONS OF TEST FOR FIRE RESISTANCE OF ELEMENTS OF STRUCTURE ETC
Part of stationMinimum provisions when tested to BS 476: Part 20-23 (mins)Method of exposure
StabilityIntegrityInsulation
1. Structural frame, beam, or column*no requirement no requirement exposed faces
2. Loadbearing wall, which is not also an external wall, separating wall, compartment wall or protecting structure (See 4, 5, 6 or 7)*no requirement no requirement each side separately
3. Floors***from underside
4. External walls
(a) any part less than 1m from point of relevant boundary 		***each side separately from inside
(b) any part 1m or more from the relevant boundary***
5. Separating wall***each side separately
6. Compartment wall***each side separately
7. Protecting structure any part***each side separately
8. Doors
(a) in a separating wall 		no provision+no provisioneach side separately when fitted in its frame
(b) in a compartment wallno provision+no provision
(c) in a protecting structure no provision**no provision
(d) any other door (including a door in a cavity barrier) no provision30no provision
9. Cavity barrier
(a) cavity barrier 1m x 1m or larger 		303015each side separately
(b) any other cavity barrier3030no provision
(c) ceiling 303030from underside

Note:

* - Period of fire resistance as specified.

** - Half the period of fire resistance for the wall or floor in which the door is situated.

+ - Period of fire resistance for the wall or floor in which the door is situated.

TABLE 3.9A: MAXIMUM NOMINAL DIAMETER OF PIPES
SituationPipe material and maximum nominal diameter [mm]
Non-combustible Material(1)Lead, aluminium, or aluminium alloy or UPVC(2)Any other material
When the pipes (include pipe supports) penetrate the structure enclosing a protected shaft which is not an exit stairway or lift shaft 150100(5)40(5)
Any other situation 150100 (stack pipe)(3),(4),(5)40(5)
75 (stack pipe)(3),(4),(5)

Note:

(1) A non-combustible material (such as for cast iron or steel pipes and the pipe supports with melting point of at least 1200ºC) which if exposed to a temperature of 750ºC will not soften nor fracture to the extent that flame or gases will pass through the wall of the pipe.

(2) Unplasticised Poly Vinyl Chloride (UPVC) pipes shall comply with BS 4514 or EN 1329-1. Use of PVC pipes shall comply with Cl.3.15.1.

(3) Within toilets, wash rooms or external corridors, maximum diameter of UPVC pipes can be increased to double the size given in the above table.

(4) Within areas of fire risk and adjacent to escape routes, UPVC pipes shall be enclosed by construction having fire resistance of at least ½-hr.

(5) Where the size of UPVC pipes exceeds that specified under this clause, approved fire collar shall be fitted at all positions where such pipes pass through constructions required to act as a barrier to fire spread.