1、STDmITU-T RECMN L-32-ENGL 1998 = 48b2591 Ob55271 516 = INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU L.32 (1 0198) SERIES L: CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE PLANT Protection devices for through-cable pene
2、trations of fire-sector partitions ITU-T Recommendation L.32 (Previously CCITT Recommendation) STD-ITU-T RECMN Lm32-ENGL 1998 W 48b2591 0655272 452 ITU-T L-SERIES RECOMMENDATIONS CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE PLANT For firther details, please refer
3、 to ITU-T List of Recommendations. STD=ITU-T RECMN L.32-ENGL 1998 4b2571 Ob55273 399 m ITU-T RECOMMENDATION L.32 PROTECTION DEVICES FOR THROUGH-CABLE PENETRATIONS OF FIRE-SECTOR PARTITIONS Summary This Recommendation describes the protection of cables by means of incombustible materials and provides
4、 information on the classification and characteristics of the sealing materials. Appendix I contains examples of methods used to apply such systems in fire-sector barriers. Source ITU-T Recommendation L.32 was prepared by ITU-T Study Group 6 (1 997-2000) and was approved under the WTSC Resolution No
5、. 1 procedure on the 9th of October 1998. Recommendation L.32 (10/98) 1 STD-ITU-T RECMN L.32-ENGL 1998 W 4B6259L Ob55274 225 W FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization S
6、ector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), whic
7、h meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information
8、technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INT
9、ELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property
10、Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, imp
11、lementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1999 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including p
12、hotocopying and microfilm, without permission in writing from the ITU. Recommendation L.32 (1098) 11 CONTENTS 1 Introduction 2 It is recommended: . Appendix I - Examples of the use of fire-stopping materials and cable management systems I . 1 1.2 1.3 1.4 for through-cable penetration of fire-sector
13、barriers Cable penetration through floor openings or grooves 1.1.1 Example 1 (see Figure 1.1) 1.1.2 Example 2 (see Figure 1.2) Cable-tray penetration position 1.2.1 Example 1 (see Figure 1.3) 1.2.2 Example 2 (see Figure 1.4) Penetration of tubingkables through a fire-sector partition . 1.3.1 Example
14、 1 - For metal or PVC tubing up to 25 mm in diameter (see Figure 1.5) . 1.3.2 Example 2 - For metal or PVC tubing of more than 25 mm in diameter (see Figure 1.6) 1.3.3 Example 3 (see Figure 1.7) Penetration of a fire-sector partition in a cable tunnel Page 1 1 2 2 3 3 4 4 4 5 5 5 5 6 . Recommendatio
15、n L.32 (10/98) 111 STDmITU-T RECMN L.32-ENGL 1998 W 48b259L 0655276 OTB = Recommendation L.32 PROTECTION DEVICES FOR THROUGH-CABLE PENETRATIONS OF FIRE-SECTOR PARTITIONS (Geneva, 1998) 1 Introduction Recommendation L.22, “Fire protection“, introduces the concept of partitioning a building into fire
16、sectors. The elements of the structure which form the boundaries of a fire sector should have fire resistance in spite of through-cable penetration positions. The fire resistance of the boundaries should be such as to ensure that the propagation of smoke and fire between fire sectors is avoided befo
17、re the extinction system is activated. In view of the large number of through-cable penetrations in the fire-sector boundaries of a telecommunication building, which diminish the effectiveness of the fire-extinction system, an appropriate strategy would consist in adopting passive smoke- and fire-co
18、ntrol measures, such as sealing of through-cable penetration positions with fire-stopping materials or the use of cable management (protection) systems. The type of cable management system will depend on the following factors: required fire-rating integrity time for walls or ceilings; construction o
19、f the fire-sector boundary; size of the cable opening; permanent sealing of cable penetrations; use of reusableh-eplaceable seals; use of inflammable pipes or ducts; number and arrangement of cables. It is recommended: that fire-stopping barriers be installed in telecommunication buildings to preven
20、t the spread of fire and smoke through openings in fire-sector boundaries; that the number of through-cable penetration positions be kept to a minimum through the design and management of the cabling network, and that “cable management systems“ be used at the penetration positions; that the minimum
21、fire separation time between fire sectors be 260 minutes, and between higher-risk fire sectors - for example, transformer rooms, rectifier and mains power switching rooms, etc. - 2 120 minutes. These recommended requirements may be tested by the method given in standard ASTM E8 14 or by other nation
22、ally authorized methods; that fire stopping materials and cable management systems which fulfil the following conditions be selected: a) they prevent the passage of smoke, flames and heat to adjacent unexposed fire sectors during the minimum specified period; b) they facilitate the installation of n
23、ew or replacement cables while maintaining the original safety conditions; Recommendation L.32 (10/98) 1 5) they have rapid sealing properties whatever the shape of the penetration opening; they will not modifi the environmental conditions, and their chemical composition will not present any health
24、hazard during installation of the fire-stopping barrier; they are resistant to ageing; they are chemically inert with respect to the cables; they have good thermal stability; they are anti-hygroscopic; they have approval certificates from authorized laboratories guaranteeing conformity with the pres
25、cribed ratings in respect of correct values: “F“ - nominal value for flame transfer to the unexposed environment; “T“ - nominal value for heat transfer to the unexposed environment; that material selected for cable management systems and fire-stopping devices be: - Intumescent When heated, they expa
26、nd, thereby forming a thick coating which provides isolation from the fire. This reaction has the effect of isolating combustible materials from both heat and oxygen, producing diluting gases and reducing inflammable gases. To obtain a perfect seal, the expansion should be restricted to filling gaps
27、, with the aid of metal collars or thin steel flanges. - Sublimable When heated, they release non-combustible gases which dilute the oxygen in the vicinity of the protected surfaces, preventing the build-up of sufficient oxygen to feed combustion. - Ablative These materials produce an incombustible
28、barrier. They are resistant to the transfer of heat and are flame inhibitors. - Endothermic Materials such as plaster or concrete, which have a high water content in their molecular composition. The heat energy produced by a fire is reduced by vaporization of the absorbed capillary humidity. APPENDI
29、X I Examples of the use of fire-stopping materials and cable management systems for through-cable penetration of fire-sector barriers 1.1 Such openings provide cable access to electric panels, main distribution frames and computing equipment. They are often situated in awkward places, for example un
30、der control panels, in corners or beneath suspended floors. They may be up to 250 mm wide and of variable length to accommodate cables of different types and diameters. Cable penetration through floor openings or grooves 2 Recommendation L.32 (10/98) STD*ITU-T RECMN L-32-ENGL 1998 4862591 Ob55278 97
31、0 W 1.1.1 One sealing method consists in: - Example 1 (see Figure 1.1) covering the whole of the opening with a ceramic fibre plate with holes fitting tightly around each cable and held in position with galvanized steel clamps; applying a fire-stopping intumescent sealing putty over the ceramic fibr
32、e plate, and around each cable and around the perimeter of the opening. - Cabe n 1, KA n / - /- Ceramic fibre plate /- T0604000-97 A-A Section Figure I.lL.32 - Example of ceramic fibre plate with intumescent putty 1.1.2 The use of fire-prevention cushions as reusableheplacement seals for cable penet
33、rations in fire-sector boundaries with thicknesses 2 150 mm or 2 75 mm (dry wall). Example 2 (see Figure 1.2) Fire-prevention cushions Wall TO604010-97 Figure 1.2L.32 - Example of the use of fire-prevention cushions The cushions are overlapped and applied with a stretcher bond, such that each layer
34、is displaced laterally with respect to the preceding layer. The opening is tightly sealed by pulling on the bags by the eyelets. Recommendation L.32 (10/98) 3 STD-ITU-T RECMN L-32-ENGL 1998 m 4862593 0655279 807 m For ceiling penetrations, a grid covering the hole is fastened to the underside of the
35、 ceiling and the cushions are placed vertically on it. 1.2 Cable-tray penetration position Cables running between the main distribution frame and switching room are generally carried on cable trays that pass through walls and floors. 1.2.1 The opening is sealed on each side of the wall or floor usin
36、g two pairs of composite metal plates, each pair being separated by intumescent material. The plates are cut for a tight fit with the cables and extend beyond the opening. They are placed on both sides of the opening and are fixed to the floor/wall. The space or gaps between the cables and between t
37、he plates and wall/floor surfaces are tightly caulked with an intumescent sealant. Example 1 (see Figure 1.3) Steel Cable tray separator Composite plate _* - Steel seDarator - Intumescent putty TO604020-97 - intumescent putty i -,/- Figure I.3L.32 - Cable management system for cable trays, using com
38、posite plates 1.2.2 For permanent sealing of medium-sized cable penetrations which require frequent alterations to the cabling, fire-prevention bricks are used. These are preformed blocks of foam of intumescent material, but are unsuitable for exposure to weathering or UV radiation. Under the cable
39、tray the bricks are laid tightly together with joints overlapping and with alternative surfaces top and bottom. Other bricks are cut to fit snugly around the cable tray and cables. The rest of the opening is plugged with bricks, some of which will need to be cut to fit. Any remaining gaps between an
40、d around the cables are filled with intumescent putty. Example 2 (see Figure 1.4) Fire prevention bricks-, . To604030-97 Cables Cable tray Figure I.4L.32 - Example of the use of fire-prevention bricks 4 Recommendation L.32 (10/98) STD-ITU-T RECMN L-32-ENGL 1998 - 4862591 Ob55280 529 = 1.3 The passag
41、e of cables through floors or walls of a fire-sector partition can be effected using PVC or metal tubing, which protects the cable from damage, both direct and during installation of the fire-stopping barrier. 1.3.1 Example i - For metal or PVC tubing up to 25 mm in diameter (see Figure 1.5) Metal o
42、r PVC tubing should be sealed by packing intumescent putty or caulking material between it and the cable(s). The inside space between the tubing and the wall/floor opening should also be caulked. Penetration of tubingkables through a fire-sector partition PVC or metal tubing 2 Tffi04040-97 Figure I.
43、5a.32 - Method of sealing tubes up to 25 mm in diameter 1.3.2 Example 2 - For metal or PVC tubing of more than 25 mm in diameter (see Figure 1.6) Metallic or PVC tubing of more than 25 mm in diameter calls for the use of metal collars coated internally with intumescent putty which, when it expands,
44、will completely plug the gap between the surface of the tubing and the collar. Intumescent putty -, - Metal collar - Screw fastenings 1- PVC or metal tubing TffiO4050-97 Figure I.6L.32 - Method of sealing tubes exceeding 25 mm in diameter 1.3.3 For the permanent sealing of single and bunched cables
45、passing through small openings (200 cm2 in walls or 130 cm2 in floors) in partitions at least 150 mm thick. Example 3 (see Figure 1.7) Recommendation L.32 (10/98) 5 STDmITU-T RECMN L-32-ENGL 1978 YB62593 0655283 Y65 4 2150mm 4, 2150mm Wall I Round hole 2 160 mm Rectangular hole 140/140 mm Single cab
46、le Bunched cables Figure 1.7L.32 - Method of sealing cables directly in a wall 1.4 An example of the passage of cables through a fire-sector partition in a cable tunnel is shown in Figures 1.8 to I. 1 O. Penetration of a fire-sector partition in a cable tunnel Cable . . . . . . . . . . . . . m TO604
47、1 00-98 Figure I.8h.32 - Cable penetration of a fire-sector partition in a cable tunnel 6 Recommendation L.32 (1098) STD-ITU-T RECMN L.32-ENGL 1998 W 48b2591 Ob55282 3TL W ir b 1200 mm 4 b 100 mm 100 mm 4 LA Y L 100mm ! I Fireproof block I 1 Fireproof adjustment biock J V I I i I i 1 Il P II II 3 Fi
48、rewail protection tape , . w . A-A sec tion TO6041 10-98 Figure I.9L.32 - Details of the cable management system in a cable tunnel Figure I.lOL.32 - Details of the cable management system in a cable tunnel Recommendation L.32 (10/98) 7 STD-ITU-T RECMN L-32-ENGL . . 3998 486259% Ob55283 238 ., . . .
49、. STD-ITU-T RECMN L-32-ENGL 1798 H 48b259L Ob55284 374 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommu
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