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21、TMA trade-mar k of the Canadian S tandards Association, operating as “CSA Group”Underground systemsC22.3 No. 7-15C22.3 No. 7-15Underground systemsMay 2015 2015 CSA Group 1ContentsTechnical Committee on Underground Construction 6Preface 91 Scope 102 Reference publications 113 Definitions 134 General
22、requirements 184.1 General 184.2 Location of underground systems 184.2.1 General 184.2.2 Standard location 184.2.3 Subsurface chambers 184.3 Steam pipelines 184.4 Crossings 194.5 Excavating 194.5.1 General 194.5.2 Backfilling 194.5.3 Surface grade 204.5.4 Unstable soils 204.6 Risers 214.6.1 Separati
23、on between risers of communication and supply systems 214.6.2 Mechanical protection of supply cables 214.6.3 Mechanical protection of supply grounding conductors 214.6.4 Mechanical protection of communication cables and conductors 214.6.5 Non-conducting covering for supply grounding conductors 214.6
24、.6 Grounding of riser pipes and guards 214.7 Installation, splicing, and termination of cables 214.7.1 General 214.7.2 Installation 214.7.3 Protection against moisture 214.7.4 Bonding supply and communication cable shields/sheaths 214.8 Distributed generation 224.9 Corrosion control 225 Depth of bur
25、ial 225.1 Depth of burial Direct-buried systems 225.1.1 General 225.1.2 Communication cables 225.1.3 Supply cables 225.1.4 Cable crossings 225.1.5 Reduced burial depth 235.2 Depth of burial Duct and subsurface chamber systems 235.2.1 General 23C22.3 No. 7-15Underground systemsMay 2015 2015 CSA Group
26、 25.2.2 Reduced depth of burial 235.3 Depth below grade Grounding conductors 236 Separations 236.1 Separations Direct-buried systems 236.1.1 General 236.1.2 Separation from structures 236.1.3 Separation from swimming pools 246.1.4 Separation from propane tanks 246.1.5 Separation from pipelines 246.1
27、.6 Crossing pipelines 246.1.7 Separation between cables in separate trenches 246.1.8 Fixed separation between cables in a common trench 256.1.9 Random separation between supply and communication cables in a common trench 256.1.10 Cable crossings 266.1.11 Common trench (supply, communication, and gas
28、) 276.2 Separations Duct systems 276.2.1 General 276.2.2 Separation from pipelines 276.2.3 Separation from swimming pools 286.2.4 Separations from propane tanks 286.2.5 Iron or steel pipe used as ducts 286.2.6 Separation between concrete-encased supply and communication duct banks 286.2.7 Separation
29、 between cables 296.3 Horizontal separation between grounding electrodes and gas lines 296.4 Separation between grounding conductors and gas lines 297 Construction of direct-buried systems 297.1 Installation of cables 297.1.1 General 297.1.2 Plowing of cables 307.2 Cable trench 307.3 Mechanical prot
30、ection 307.3.1 General 307.3.2 Installation of mechanical protection 307.4 Building entrances 318 Construction of duct banks 318.1 General 318.2 Materials 318.3 Loadings 318.4 Ducts in bridge structures 318.5 Ducts encased in concrete 328.6 Ducts enclosed in steel pipe 328.7 Ducts requiring no addit
31、ional protection 328.8 Ducts with additional protection 328.9 Grading of ducts 328.10 Settling 338.11 Cleaning and testing of ducts 33C22.3 No. 7-15Underground systemsMay 2015 2015 CSA Group 38.12 Cable pulling tension 338.13 Terminating ducts 338.13.1 General 338.13.2 Entrances to buildings and oth
32、er structures 339 Construction of subsurface chambers and subsurface boxes 349.1 Wheel load capability of underground civil works and subsurface boxes 349.2 Backfilling 349.3 Dimensions 349.4 Duct entrances into subsurface chambers 349.5 Drainage 349.6 Roof openings in subsurface chambers 349.7 Subs
33、urface chamber covers and openings 359.8 Hardware 359.9 Ventilation 359.10 Safe access, working, and rescue provisions 359.11 Accessibility of cables 369.12 Guarding of live parts in subsurface chambers 369.12.1 Cable splices or terminals 369.12.2 Electrical equipment 369.13 Seismic withstand 3610 A
34、bove-ground equipment 3610.1 Location of above-ground facilities 3610.2 Working space 3710.3 Supply equipment 3710.4 Joint-use equipment 3710.5 Mechanical protection of pad-mounted equipment 3710.6 Seismic withstand 3711 Installations on railway rights-of-way 3811.1 Loading 3811.2 Crossings 3811.3 C
35、asing pipe material 3811.4 Installation of casing pipes 3811.5 Longitudinal cable installations on railway rights-of-way 3911.5.1 Ducts laid longitudinally on railway rights-of-way 3911.5.2 Direct-buried, longitudinal cable installations on railway rights-of-way 3911.6 Depth below base of rail 3911.
36、6.1 Depth below base of heavy rail 3911.6.2 Depth below base of light rail 3911.7 Horizontal distance from railways 3911.7.1 Horizontal distance from heavy rails 3911.7.2 Horizontal distance from light rails 4012 Submarine cable installations 4013 Transmission cable installations 40C22.3 No. 7-15Und
37、erground systemsMay 2015 2015 CSA Group 414 Electrical requirements 4114.1 Induced voltages and current 4114.2 Overvoltage protection 4114.3 Inductive coordination 4114.4 Overcurrent protection Supply cables greater than 750 V 4114.5 Communication cables 4214.6 Voltage limitations on communication c
38、ables 4214.6.1 General 4214.6.2 Metal sheathed cable 4214.6.3 Supply line requirements 4214.7 Electrical protection Direct-buried systems 4314.7.1 General 4314.7.2 Communication and supply cables in a common trench 4314.7.3 Communication and supply cables installed at random separation in a common t
39、rench 4315 Grounding and bonding 4315.1 General 4315.2 Current-carrying capacity 4315.3 Supply cables operating at a voltage greater than 750 V 4415.4 Supply equipment (pad-mounted and in chambers) 4415.4.1 Pad-mounted supply equipment 4415.4.2 Equipment in chambers 4415.5 Supply grounding electrode
40、s and connections 4415.6 Grounding conductors 4515.6.1 Conductor composition 4515.6.2 Gradient control 4515.7 Bonding of communication and supply equipment 4516 Records and identification of underground plant 4516.1 Records 4516.2 Marking of plant locations 4516.2.1 General 4516.2.2 Marking for redu
41、ced depth of burial of supply cables 4516.3 Identification of direct-buried cable ducts 4516.4 Temporary identification 4616.5 Identification of cables and apparatus 4616.5.1 Identification of apparatus, devices, and enclosures 4616.5.2 Identification of multiple cables 4616.6 Identification of cabl
42、es in subsurface chambers 4616.7 Identification of jacketed cables 4616.8 Identification of interconnected apparatus causing abnormal backfeed 4716.9 Identification of switching devices 47Annex A (informative) Commentary 55Annex B (informative) Typical street location of various services 72Annex C (
43、informative) Surface channel systems 75Annex D (informative) Communication cables, supply cables, and gas distribution in a common trench 78Annex E (informative) Directional boring 81C22.3 No. 7-15Underground systemsMay 2015 2015 CSA Group5Annex F (informative) Microtrenching 82C22.3 No. 7-15Undergr
44、ound systemsMay 2015 2015 CSA Group 6Technical Committee on Underground ConstructionJ. Ct Hydro-Qubec-Distribution, Montral, Qubec Category: Communication/Power UtilityChairE.S. Alfonso TELUS, Burnaby, British Columbia AssociateT. Ayers Canadian Pacific Railways, Calgary, Alberta Category: CarriersM
45、.D. Bell Hydro One Networks Inc., Toronto, Ontario Category: Communication/Power UtilityS. Cumminger Bell Aliant, Halifax, Nova Scotia Category: CarriersM.G. Ereth SaskPower, Regina, Saskatchewan Category: Communication/Power UtilityS. Faubert Bell Canada, Newmarket, Ontario Category: CarriersL. Gal
46、laugher Utilities Standards Forum, Guelph, Ontario AssociateM.S. Gardner Alberta Safety Codes Council, Beaumont, Alberta Category: General InterestC.L. Gartner SaskTel, Regina, Saskatchewan AssociateJ. Gillis COGECO Cable, Niagara Falls, Ontario Category: CarriersC22.3 No. 7-15Underground systemsMay
47、 2015 2015 CSA Group 7K.C. Hamilton Manitoba Hydro, Winnipeg, Manitoba Category: Communication/Power UtilityJ. Hecimovic Toronto Hydro, Toronto, Ontario AssociateL.J. Hiivala Toronto, Ontario Category: General InterestJ. Hrycyshyn Electrical Safety Authority, Mississauga, Ontario Category: General I
48、nterestM. Jaffer Calgary, Alberta AssociateC. Kafel Enersource Hydro Mississauga, Mississauga, Ontario AssociateM. Kelvin BC Hydro, Burnaby, British Columbia Category: Communication/Power UtilityP.G. Krotky Automated Solutions International Inc., Cambridge, Ontario Category: General InterestF.L. Kuc
49、hta Prysmian Power Cables and Systems USA, LLC, Lexington, South Carolina, USA Category: General InterestP. Ling FortisBC Energy Inc (FEI), Surrey, British Columbia Category: CarriersE. Low TELUS, Burnaby, British Columbia Category: CarriersJ.A. McFadgen Nova Scotia Power Inc., Halifax, Nova Scotia Category: Communication/Power UtilityD. Mercier Bell Canada, Varennes, Qubec AssociateC22.3 No. 7-15Underground systemsMay 2015 2015 CSA Group 8C.R. Moore Enbridge Gas Distribution, Toronto, Ontario Category: CarriersS. Nahyaan Toronto
