Pathway decisions outlive every other part of the install. Cable gets replaced. Devices get replaced. The conduit and the supports stay in the walls for the life of the building. Get this layer right at design and the next twenty years of cable refreshes are pulls, not rebuilds. Get it wrong and the second cable refresh becomes a new conduit bid.
This chapter is the longest in the document because pathway choices touch every other chapter. Read it once cover to cover. The rest of the document references the rules below instead of repeating them.
Conduit type by environment
When the rule applies
Every conduit run on the project. The conduit material is decided by where the conduit lives, not by what is in it or what is on the truck. The CEC and the OBC define what is permitted in each environment; the project specification narrows it further. The list below is the working default for institutional security work in Canada.
The spec
// CONDUIT TYPE BY APPLICATION EMT (electrical metallic tubing) : interior horizontal runs above 1200 mm AFF in finished and unfinished non-detention spaces. CSA C22.2 No. 83. Insulated-throat connectors. Rain-tight fittings on any 50 mm and smaller EMT in damp or condensation-prone locations.RGS (rigid galvanized steel) : exposed exterior, semi-exterior, all interior conduit below 1200 mm AFF in mechanical and electrical rooms, conduit feeding any service over 600 V, and every conduit run inside a detention envelope.IMC (intermediate metallic conduit) : acceptable wherever RGS is required, except inside detention envelopes (where the project specification almost always names RGS) and inside classified hazardous locations. Saves labour on long exterior runs.Epoxy-coated RGS : corrosive-atmosphere indoor and outdoor: chemical storage, water and wastewater plants, indoor pools, kitchen back-of-house, salt-storage buildings, fleet wash bays.LFMC (liquid-tight flexible metal conduit) : final connections to motorized equipment, distribution transformers, vibrating equipment, outdoor enclosures. Minimum 450 mm and maximum 600 mm with a 180° loop where possible. CSA C22.2 No. 56.FMC (flexible metallic conduit, “Greenfield”) : across building expansion joints, with no less than 600 mm of extra curve to absorb movement. Not used inside detention. Not used on supervised loops (failure is undetectable).Rigid PVC (Schedule 40 or 80) : underground branch, in-slab branch in poured concrete, underground exterior beneath paving. CSA-approved, FT4. Separate ground conductor required (PVC is not a ground).ENT (electrical non-metallic tubing) : embedded in concrete floor slabs only, with written engineer consent. CSA C22.2 No. 227.1 and No. 85. Not used in plenum or riser spaces, not used for security signal outside specific in-slab branch circuits.
Field note
For interior EMT and exterior RGS, the conduit itself is brand-agnostic as long as the CSA listing matches the application. Where the brand matters is the supports and the connectors, not the pipe. Iberville for the boxes and the fittings. Cobra for the clamps. Eaton B-Line or Unistrut for the strut. Thomas & Betts for sealing fittings and EYS conduit fittings. That combination has held up across institutional projects for years and the AHJ rarely questions it.
For PVC, IPEX is the Canadian-made default. Schedule 40 for general underground, Schedule 80 under roads or high-traffic surfaces. IPEX Cor-Line ENT for the rare in-slab application where the engineer approves it.
Minimum conduit size
When the rule applies
Every conduit feeding a security signal, structured cabling, or low-voltage device drop. The CEC permits 13 mm (1/2”) for general branch circuits; security and structured cabling work uses 19 mm (3/4”) as the minimum because every device drop sees at least one cable replacement during the building’s life and 1/2” does not give you the working room.
The spec
13 mm (1/2”) absolute CEC minimum for general electrical work; not used for security signal or structured cabling 19 mm (3/4”) minimum for any structured cabling, security signal, or low-voltage signal run 25 mm (1”) minimum from a workstation outlet (double-gang box) to the nearest raceway or pull point 50 mm (2”) and larger. factory-made elbows; no site-made bends Drawing sizes are minimum sizes; do not decrease without engineer review and AHJ acceptance
Field note
Conduit support spacing
When the rule applies
Every conduit run on the project, suspended or surface-mounted, indoor or outdoor. The CEC sets maximum spacing at 1.5 m (5 ft) for EMT and 0.9 m (3 ft) for RGS in most positions. Within 0.9 m of every junction box, conduit body, and termination the spacing is tighter, regardless of conduit type. This is the most common spacing rule that AHJ inspectors fail integrators on.
The spec
// THE 5-3-3 SUPPORT RULE EMT : 1.5 m (5 ft) maximum between supports on suspended and surface-mounted runsRGS : 0.9 m (3 ft) maximum between supports on suspended and surface-mounted runsWithin 0.9 m (3 ft) of every box, conduit body, and termination , regardless of conduit typeWithin 0.3 m (1 ft) of every change in direction , in addition to the run-spacing ruleSupport every conduit independently from building structure (slab, wall, structural steel) Not from ceiling grid wires, ductwork, piping, cable tray, or formed steel decking. 12-gauge galvanized steel strut (1-5/8” / 41 mm width) for runs of two or more parallel conduits, supported on minimum 6 mm (1/4”) threaded rod from structure on 1.5 m (5 ft) maximum centres
Field note
Cobra one-hole HDG malleable iron straps for single conduits in 1/2” through 4” trade sizes. Cobra two-hole for vibration-prone runs. Eaton B-Line or Unistrut strut for any run of two or more parallel conduits with matching channel nuts and end caps. Galvanized all-thread rod, 1/4” minimum for two-conduit channel and lighter, 3/8” for three-conduit and heavier. Cobra galvanized iron beam clamps for attachment to exposed structural steel. Hilti HKD or Red Head Multi-Set drop-in anchors for slab attachment under load.
What the AHJ fails you for
Hanger types by application
When the rule applies
Every conduit run that does not surface-mount directly to a wall. The clamp on the conduit is one decision; the hanger between the clamp and the structure is another. Match the hanger to what is above the conduit.
The spec
Beam clamps on exposed structural steel Galvanized iron beam clamp sized for the flange width and the rod size. Drop a piece of all-thread from the clamp and land on a single strap or on a length of strut for multi-conduit runs. All-thread rod from concrete inserts or drop-in anchors For slab-mounted hangers in interior spaces. Concrete inserts are cleaner if the slab is poured around them; drop-in anchors work after the fact. Verify pull-out rating against the loaded weight. Trapeze hangers Two threaded rods supporting a horizontal piece of strut. Used for runs of three or more conduits, or for a single large RGS run that needs lateral stability. Size rod and strut against the loaded weight per the manufacturer’s table. Side-beam clamps and angle brackets For attaching conduit to wall studs, columns, and the sides of structural beams. Angle brackets give the standoff needed for a smooth bend at a corner. J-hooks and bridle rings For non-conduit cable support. Covered in the J-hook section below. Field note
Conduit fittings, terminations, and bushings
When the rule applies
Every fitting between two pieces of conduit, every fitting between conduit and box, every termination. Fittings get the same care as the conduit they connect, because the fitting is where conductors are most likely to get damaged during pulling and most likely to suffer from moisture intrusion during service.
The spec
EMT fittings: insulated-throat steel set-screw or compression couplers and connectors EMT in damp, semi-exterior, or condensation-prone locations: rain-tight fittings on every 50 mm and smaller EMT compression connectors required for all conduit penetrating exterior walls, floor slabs, and any vapour-barrier penetration RGS fittings: threaded couplings, elbows, unions. Running threads not permitted (use a coupling and a length of nipple) Galvanized to match conduit. Conduit bodies (LB, T, C, X) for direction changes that are not full-radius elbows. Covers gasketted in damp and exterior locations. Plastic insulating bushings on every conduit termination at every box, no exceptions Bonding bushings on RGS runs over 600 V or where the panel schedule calls for it Conduit waterfalls on all 4” trade-size conduit terminating in cabinets, racks, or pull boxes (cable bend protection at exit) Sealing fittings at every classified hazardous location boundary, every interior-to-exterior wall penetration on conditioned-to-unconditioned space, and every vapour-barrier penetration. Poured with the listed sealing compound.
LBs are prohibited on communications pathways
Field note
Thomas & Betts for EMT compression connectors, sealing fittings, and EYS. Iberville for conduit bodies and threaded hubs. Plastic insulating bushings on every termination. they cost almost nothing and they keep the AHJ inspector moving. Bonding bushings where the panel schedule says so; do not substitute.
Bend radius and bend count per run
When the rule applies
Every conduit run between pull points. Every bend is a friction point during cable pulling and a long-term stress point on the cable inside. The rules below come from the institutional communications specification and hold for every security pathway.
The spec
// BENDS PER RUN AND BEND RADIUS Maximum two 90° bends, or 180° total, per conduit run between pull points Pull box at every 30 m (100 ft) of conduit length, regardless of bend count Pull boxes are not used as bends; conduit enters and exits the box on the same axis where geometry permits Bend radius for conduit 50 mm (2”) and smaller: minimum 6× the conduit diameter Bend radius for conduit larger than 50 mm (2”): minimum 10× the conduit diameter Site-made bends in EMT: hydraulic or hand bender only. No kinking, no flattening, no jacket flake. Site-made bends in RGS up to 50 mm: hydraulic or mechanical bender. RGS larger than 50 mm: factory-made elbows only. PVC bends to 50 mm: heat-gun made bends acceptable. Above 50 mm: factory elbows only.
The two-90 rule in practice
Run conduit in straight lines wherever you can. The two-90° budget is for unavoidable jogs around structural elements, the rise from slab to ceiling space, and entry to the device backbox. A run that needs three bends gets a pull box; a run that needs four bends gets two pull boxes. Cable pulled through three bends without a pull box exceeds the manufacturer’s pull tension specification and the cable does not certify even when it tests clean on day one.
Pull box sizing
When the rule applies
Every pull box on every conduit run. Pull boxes that are too small are the second most-common cable-pull defect after exceeded bend count. The box size is dictated by the largest conduit entering it and by the geometry of the cable making the turn.
The spec
// PULL BOX MINIMUM DIMENSIONS Straight pull-through: minimum length equal to 8× the inside diameter of the largest entering conduit Angle and U pulls: minimum distance from conduit entry to opposite wall equal to 6× the inside diameter of the largest entering conduit, plus the sum of the diameters of every other conduit entering on the same wall 4” trade-size conduit pull boxes: minimum 30” × 24” × 6” (762 × 610 × 152 mm) regardless of the 8× calculation result Vertical conduits: pull boxes provide straight pass-through for vertical cables (no off-axis turn at the box) Pull box covers: screw-type, not hinged 24” × 24” minimum access panel where pull boxes are installed in inaccessible ceiling spaces Pull boxes provided at every 30 m (100 ft) of run, at not less than 30 m intervals Cover labelled with the system designation (security signal, communications, power) and circuit identification per chapter 06
Field note
Hammond galvanized or prime-coated steel boxes, screw-cover, sized from the Hammond catalogue against the calculated minimum dimension. Hammond 1414 series for general-purpose interior. Hammond 1418 series for larger pulls. Hammond N1J series (NEMA 1) for clean indoor wall mount. Hammond N4 and N4X series (NEMA 4 / 4X) for damp, washdown, and exterior. For surface-mount transitions on raceway, Legrand / Wiremold boxes matching the raceway series. For PVC runs, CSA-certified PVC boxes solvent-welded with PVC adapters.
Backboxes for security devices
When the rule applies
Every device on a security install lands in a backbox. The backbox dimension is the difference between a clean termination with service slack and a cable jammed against the device that fails three years in.
The spec
// BACKBOXES BY DEVICE TYPE Communications and security signal general : 4-11/16” × 4-11/16” × 2-1/2” (119 × 119 × 64 mm) minimumWorkstation outlets, double-gang locations : double-gang box with 25 mm (1”) conduit minimum to nearest raceway or pull pointCard reader at door : single-gang or double-gang to match reader cutout, 2-1/2” minimum depth, 19 mm (3/4”) conduit to the door junction or panelCamera at finished ceiling : 4” octagon or 4-11/16” square box, supported independently from ceiling grid, attached to structural ceilingCamera on exterior wall : 4-11/16” weatherproof cast box (FS or FD series), gasketted cover, conduit entry from below or rearDoor position switch : 4” square box at door header, strike side, 50 mm (2”) in from frame edgeRequest-to-exit (REX) sensor : above door frame, centred over clear openingIntercom station : depth and dimension per manufacturer mounting cutout, 25 mm (1”) conduit minimum to riserThrough-wall, exterior, vapour-barrier : cast Feraloy (FS, FD) with sealed entriesPlaster ring / raised cover : 3/8” deep minimum on every stud-wall backbox to bring device flush with finished surfaceStagger backboxes in walls and partitions; no back-to-back. Seal against sound transmission per architectural acoustic spec.Through-wall boxes : prohibited for any application
Field note
Iberville stamped galvanized steel boxes for stud-wall outlets, with 3/8” raised cover or matching plaster ring. For CMU walls, an Iberville masonry-rated box submitted on shop drawing so the box geometry matches the block course and clears the rebar. Iberville cast Feraloy FS or FD series for exterior weather boxes; threaded plugs in every unused conduit entry. Cameras land in Iberville 4-11/16” square boxes supported from structure with all-thread to the slab.
Conduit fill
When the rule applies
Every conduit on the project, sized at design and verified at pull. The CEC’s fill table is the inspection-day rule. The design-day rule is tighter, because a conduit at code maximum on day one has no room for additions or substitutions.
The spec
Design-day maximum : 30% of conduit cross-sectional areaCode-day maximum (CEC Table 8) : 40% for three or more conductors, 31% for two conductors, 53% for one conductorCat 6A in 21 mm (3/4”) EMT: 2 cables max at code, 0 cables with design margin Cat 6A in 27 mm (1”) EMT: 3 cables at code (137 mm² at 40%, 132 mm² actual cable) Cat 6A in 35 mm (1-1/4”) EMT: 4 to 6 cables with design margin Different cable types in same conduit: only where code permits (no power and signal mixing) and worst-case bend radius and pull tension are met for all types Coax and Cat 6A: never in the same conduit. Separate conduits or metallic divider in cable tray. 20% spare conduit capacity in every underground duct bank and every backbone riser, minimum one fully-empty spare conduit per route Use manufacturer’s actual jacket diameter from the data sheet, not the nominal value, when fill is within 5% of the limit
Worked example
// CAT 6A FILL CALCULATION A 21 mm (3/4”) EMT has an interior cross-sectional area of 213 mm² (0.330 in²) The CEC 40% maximum is 85 mm² (0.132 in²) of cable area. A typical Cat 6A jacket is 7.5 mm in diameter and has a cross-sectional area of 44 mm² (0.069 in²) Two Cat 6A cables fill 88 mm², which is over the code limit before any margin is added.
For three Cat 6A cables: the minimum size is 27 mm (1”) trade size, which provides 137 mm² at 40% fill. Three cables × 44 mm² = 132 mm², passes.
For four Cat 6A cables: 4 × 44 = 176 mm². Move up to 35 mm (1-1/4”) trade size.
Run the math at design, not at pull.
Expansion and seismic fittings
When the rule applies
Every metallic conduit run that crosses a building expansion joint, plus PVC conduit on long runs that see significant temperature swings. Buildings move. Conduit that crosses an expansion joint without an expansion fitting transfers the movement to the conduit and either the conduit cracks at the fitting or the cable inside fatigues until it opens.
The spec
Manufactured expansion fitting at every building expansion joint crossed by metallic conduit Movement allowance: minimum 100 mm (4”) axial travel for typical building joints, or as specified by the structural engineer for the project’s specific joint movement FMC (galvanized steel flexible) acceptable at expansion joints with no less than 600 mm (24”) extra curve PVC conduit: manufactured expansion fittings at the spacing recommended by the conduit manufacturer (typically every 30 m indoor, every 9 m outdoor, against calculated thermal movement) Seismic restraints on conduit runs above 50 mm (2”) trade size in seismic Category C and higher zones; restraint design from the structural engineer Bonding jumper around every expansion fitting on RGS to maintain ground continuity (jumper sized per CEC Table 16)
Thermal expansion math for PVC runs
// CALCULATING PVC THERMAL EXPANSION The coefficient of linear thermal expansion for rigid PVC is roughly 5.2 × 10⁻⁵ in/in/°F, against 6.5 × 10⁻⁶ in/in/°F for steel. A 30 m (100 ft) outdoor PVC run that sees a 50°C (90°F) summer-to-winter swing expands and contracts roughly 140 mm (5.5”) One expansion fitting absorbs that movement; a PVC run without one cracks at the first cold snap.
The expansion-fitting data sheet gives the per-fitting movement allowance. Divide the calculated total movement by that figure to get the number of fittings required.
Field note
Thomas & Betts XJ-series for metallic expansion fittings, sized to the calculated movement. For PVC, the IPEX expansion coupling matched to the conduit schedule. Always include a bonding jumper across the metallic fitting; the AHJ will check.
Sealing fittings and vapour-barrier penetrations
When the rule applies
Every conduit penetrating from a conditioned interior space to an unconditioned exterior space. Every conduit crossing a vapour barrier on a conditioned-space wall. Every classified hazardous location boundary.
The spec
Sealing fitting at every interior-to-exterior wall penetration on conduit between conditioned and unconditioned space Sealing fitting at every classified hazardous location boundary per CEC Section 18 and the area classification drawing Sealing fitting at every vapour-barrier penetration, on the warm side of the vapour barrier Fitting installed with the cover on the accessible side of the wall, vertical orientation that allows poured compound to fill the chamber without trapping air Sealing compound: manufacturer-approved (Chico A or equivalent), poured to the level of the fitting’s pouring slope, cured per the manufacturer spec before energizing or pulling cable Conductor count limited per fitting size table (the fitting’s heat dissipation defines a maximum conductor cross-section) Fitting installed before cable pulling. Sealing compound poured after termination is complete on both sides.
The exterior camera condensation trap
// THE MOST COMMON SEALING DEFECT Exterior camera installs are the most common place to find a missing sealing fitting. Conduit runs from the indoor IDF through the wall, drops down to the camera junction box on the exterior, and the technician seals only the box-to-camera entry against weather. The conduit run itself fills with condensate over the next winter. The moisture pools at the lowest point, freezes, and either corrodes the cable termination or cracks the conduit body.
Fix: a sealing fitting on the warm side of the building envelope, every time, not negotiable.
Field note
Thomas & Betts EYS sealing fittings sized to the conduit trade size. Chico A sealing compound, poured per the fitting’s pouring slope, cured for the manufacturer’s full window before pulling cable. Verify cure time against the SDS; cold weather slows it down significantly.
Mounting heights for security devices
When the rule applies
Every device on the install. The heights below are field defaults; project drawings and AHJ override where the application is specific. ADA-compliant heights apply to any device a member of the public is expected to operate, including readers at public entries, intercoms at vestibules, and panic-button devices in public-access areas.
The spec
// MOUNTING HEIGHTS (AFF UNLESS NOTED) Card reader, general : 1100 mm (44”) to centre of reader, ADA-compliant; 1200 mm (48”) where ADA does not applyCard reader, door-operator paired : 1000 mm (40”) to centre, coordinated with the operator push plate heightDoor position switch : top of door frame, strike side, 50 mm (2”) in from frame edgeRequest-to-exit (REX) sensor : above door frame, centred over clear openingIntercom station, general : 1200 mm (48”) to centre of speaker grilleIntercom station, ADA vestibule : 1100 mm (44”) to centre, call button reachable per ADACamera, interior general : 2700 mm (108”, 9 ft) AFF minimum, structural ceiling or wallCamera, exterior perimeter : 4000 mm (157”, 13 ft) AFF minimum, on building exterior or pole, vandal-resistance considered for public elevationsCamera, detention holding cell : 3700 mm (12 ft) AFF minimum, anti-ligature hardware, fed from secure side (chapter 16)Glassbreak detector : 4500 mm (15 ft) maximum distance from protected glass, opposite or adjacent wall at ceiling levelMotion detector (PIR, dual-tech) : 2200 to 2700 mm (88-108”) AFF, aimed across the room rather than downPanic button under desk : no specific AFF, mounted at natural seated reachWall-mounted control panel and keypad : 1200 mm (48”) to centre, general staff; 1100 mm (44”) for ADA-required locationsSurface-mounted backbox depth : 19 mm (3/4”) protrusion minimum from finished wallThrough-wall conduit protrusion into rooms : 75 mm (3”) minimumFloor sleeves : 50 mm (2”) minimum above finished floor
Surface raceway
When the rule applies
Retrofit work where the wall cannot be opened. Exposed runs in finished public spaces where architecture prefers a clean rectangular profile over visible round conduit. New-build situations where in-wall conduit was not specified at design and adding it after framing is impractical.
The spec
Steel surface raceway, two-piece (base and cover), powder-coated finish matching architectural specification Raceway sized so calculated cable cross-section is no more than 40% of raceway internal area at install Profile by application:: 700 series. short runs of one or two communications cables 2000 series. typical multi-cable run 4000 series. high-density risers and patch panel feeds 6000 series. backbone feeds where multiple raceways converge Boxes, fittings, accessories from the same series and same manufacturer as the raceway Internal fittings factory-formed; no field-formed transitions except at custom junction boxes designed for the application Fastener spacing: 1.0 m (3 ft) maximum on raceway base, fastener within 150 mm (6”) of every box, fitting, and termination Bonding: each section grounded to the equipment ground in the served device or to the building TGB per chapter 04
Field note
Legrand / Wiremold is the institutional default. V2000 series two-piece steel raceway for general-purpose work, with matching V2010 / V2011 / V2400 fittings. 4000 series for high-density runs. 6000 series for backbone feeds. OFR or 880 series for floor and base raceway at desk drops. Plugmold 20- or 24-amp series for plug-in receptacle distribution. Use the manufacturer’s matching surface-mount transition boxes; do not improvise.
Cable tray
When the rule applies
High-density runs in equipment rooms, riser shafts, and any space where the cable count exceeds what conduit can practically support. Wire-mesh tray is the institutional standard for communications work. Ladder and solid-bottom trays serve other applications and are out of scope here.
The spec
Wire-mesh, 5 mm (0.196”) wire diameter minimum, welded intersections forming 50.8 × 101.6 mm (2” × 4”) grid Sections 3048 mm (10 ft) or 1524 mm (5 ft) Widths 100 mm (4”) through 610 mm (24”) sized to calculated cable count plus 25% spare Sidewall heights 50, 102, or 152 mm sized so cable fill never exceeds side rail height Tray ends formed downward at 90° for drop-in installation onto manufacturer supports Hot-dipped galvanized after fabrication. UL Classified for grounding purposes. All system components from a single manufacturer Cable fill: cable cross-sectional area no more than 50% of interior tray area. Cable depth never exceeds the side-rail height. Tray support spacing: 1.5 m (5 ft) maximum per ANSI/EIA/TIA-569-C; supports within 0.6 m (2 ft) of every splice or intersection if not directly under the splice Support on both sides of every elevation change Clearance: 305 mm (12”) above and below tray, 305 mm between stacked trays, 76 mm (3”) above drop-ceiling tiles, 25 mm (1”) between top of tray and bottom of raised-floor tile Different media types in same tray: full-length metallic divider, each media calculated independently against 50% of its divided area Bonded to TGB with #6 AWG bonding conductor, bonds verified at every splice and intersection (chapter 04)
Field note
Cablofil (Legrand) and Panduit FastTrac wire-mesh tray are the two field defaults. Pick one and stay in that manufacturer’s accessory line for splices, brackets, drops, and waterfalls. Side-action bolt cutters with offset head for cutting sections. Panduit CMW-KIT cable waterfalls at tray exits. Bond to the TGB with #6 AWG and verify continuity at every joint at commissioning.
J-hooks for non-conduit cable support
When the rule applies
Low-density horizontal cable runs in accessible ceiling spaces above finished rooms, where conduit is overkill and tray would be wasteful. J-hook support is acceptable only where the engineer of record has signed off on the application.
The spec
NRTL-listed J-hook for plenum installation where the ceiling is a plenum return Telecommunications-specific J-hook with bearing surface wide enough to honour the bend radius of Cat 6A and high-performance fiber Flared edges to prevent damage during cable installation Top latch or removable retainer strap to hold the bundle; retainer removable and reusable in plenum applications Spacing: 1.5 m (60”) maximum on horizontal runs not in conduit or tray Fill: 25% maximum of hook’s stated capacity at install, leaving 75% for future cable additions Cable slack between hooks: 150 mm (6”) minimum above ceiling, measured from lowest point of cable to top of ceiling tile or structure J-hook at every change in direction (in addition to the run-spacing rule) Supported from structural ceiling (deck above), not from suspended ceiling grid wires Cables not supported by ductwork, piping, or ceiling-grid wires
Field note
Panduit J-Pro J-MOD series with the bend-radius bearing surface and the removable retainer strap, sized JP131 (3/4”), JP2 (1-5/16”), or JP4 (2-1/16”) to the cable bundle diameter plus the 75% spare. CommScope cable hooks are the field-equivalent on CommScope projects. Cobra galvanized iron beam clamps for attachment to structural steel with all-thread to the J-hook. 12-gauge steel support wire from structure where there is no beam; ceiling-grid attachment is sway control only, not load-bearing.
Riser slots, sleeves, and floor penetrations
When the rule applies
Vertical conduit and cable runs between floors. These penetrations are firestopped at every floor per chapter 05, but the slot or sleeve geometry is decided at the pathway-design stage and the firestop comes after.
The spec
Slot or sleeve protrudes minimum 50 mm (2”) above finished floor at the upper level (curb to keep water from entering the riser) Sleeve material matches riser conduit material: galvanized steel for steel conduit, Schedule 40 PVC for PVC conduit Sleeves sized 25% larger than the conduit OD to accept the firestop product without compromising the conduit fit Slots in floor slabs sized for as-built cable count plus 25% spare, with firestop product compatible with slot geometry Conduit terminates with plastic bushing on both sides of the floor penetration. Bushing independent of firestop, stays in place after firestop is applied. Multi-cable slot fed by tray or J-hook: tray or hook continues into and through the slot, supported on both sides of the floor Slots and sleeves identified on as-built drawings with type, fire rating, and firestop product reference per chapter 05 Floor and wall slots and sleeves firestopped after cable installation per chapter 05. The slot or sleeve itself is not a firestop.
Separation from power and other systems
When the rule applies
Every communications and security signal pathway. The numbers below apply to open cable, J-hook, conduit, and cable tray pathways. The CEC and the institutional communications spec both reference these distances.
The spec
// MINIMUM SEPARATION DISTANCES Unshielded power lines or electrical equipment, open or non-metallic pathway : <2 kVA: 127 mm (5”) 2 to 5 kVA: 305 mm (12”) >5 kVA: 610 mm (24”) Unshielded power, grounded metal conduit pathway : <2 kVA: 64 mm (2.5”) 2 to 5 kVA: 152 mm (6”) >5 kVA: 305 mm (12”) Power lines in grounded metal conduit, grounded metal conduit pathway : 2 to 5 kVA: 76 mm (3”) >5 kVA: 152 mm (6”) Motors and transformers : 1.2 m (4 ft) minimum on every sidePower conduit and cables <1 kV : 0.3 m (1 ft) minimumPower conduit and cables >1 kV : 1.0 m (3 ft) minimumFluorescent and similar luminaires : 300 mm (12”) minimumPipes (gas, oil, water, hydronic) : 120 mm (5”) minimumHVAC equipment, ducts, and fittings : 150 mm (6”) minimumCoax (CCTV/CATV) and Cat 6A : never in the same pathway. Separate conduits or metallic divider in cable tray.
Why 150 mm from hot pipes
// THE HOT-PIPE RULE IS ABOUT JACKET TEMP The CEC and institutional spec both call out 150 mm (6”) minimum from hot piping or hot equipment. The rule is about cable jacket temperature, not about EMI. Cable jackets are rated to a specific operating temperature (60°C general-purpose, 75°C plenum) A conduit run within 150 mm of a hot-water riser or steam line sees the jacket temperature climb above the rated maximum. The jacket softens, the cable inside settles into the jacket, and the geometry of the pair separation degrades. The cable still tests fine on commissioning day, but it ages out years early and the next certification finds NEXT failures that were not there at install.
Identification and labelling on conduit
When the rule applies
Every conduit on every project. Identification at both ends with destination, system designation, and project-standard colour band. Detail in chapter 06.
The spec
// CONDUIT IDENTIFICATION SUMMARY Permanent label at every conduit termination identifying destination, system, and cable count Colour band painted around conduit at every termination and every transition point: green for communications, blue for security, red for fire alarm, orange for emergency power, no band for normal power. Full convention in chapter 06. Pull-cord label at every empty conduit reserved for future use, identifying intended system and project spec reference Run conduits parallel or perpendicular to building grid lines for visual identification at distance
Underground and direct-burial pathway
When the rule applies
Conduit between buildings, between equipment yards, between the building and the perimeter. The institutional default is a concrete-encased duct bank for any campus run.
The spec
Concrete-encased duct bank: PVC conduit (Schedule 40 minimum, Schedule 80 in high-load areas) embedded in red-dyed concrete 20% spare conduits in every duct bank, minimum one fully-empty spare. A 4-conduit bank is built with 5 conduits. Slope: 1% minimum toward a drainage point (handhole, manhole, or building entry pit) Drainage point: handhole or manhole at the low point with a sump sized to absorb expected groundwater inflow Direct-burial flexible polyethylene only where duct bank is not permitted; depth and warning tape per CEC and provincial dig-safety Conduit bed: well-tamped flat earth, free from rocks. Sand backfill around the conduit to project-spec depth. Pull cord: 3 mm minimum polypropylene fish line in every conduit, occupied and spare Underground-to-building entry: PVC or RGS sweep elbow to a conduit body, then to interior pathway. Sealing fitting on the interior side of the building wall. Manhole or handhole: pre-cast concrete, lid sized to conduit count, ground rod inside connected to building TGB through the duct-bank bonding conductor OSP-to-indoor transition splice: inside a manhole, handhole, or interior pull box within 15 m of the boundary (chapter 07)
Field note
IPEX Schedule 40 PVC for standard duty, IPEX Schedule 80 under roads or high-traffic surfaces. Concrete encasement at 75 mm (3”) minimum cover all sides, red-dyed mix, mechanically vibrated to fill voids. Pre-cast concrete manholes with the ground bus and pulling iron specified on the manhole drawing. For direct burial where duct bank is not permitted, medium-density CSA-certified continuous-coil polyethylene conduit.
The detention envelope: where the pathway changes
When the rule applies
Inside detention areas, holding cells, sallyports, and the prisoner-side of any custody door. The pathway rules tighten substantially. Detail in chapter 16; this section captures the pathway-side rules so the detention chapter does not repeat them.
The spec
// PATHWAY IN DETENTION ENVELOPE RGS only. EMT, IMC, FMC, LFMC, and PVC are not used inside the detention envelope. Conduit feeds device boxes from above through the slab where structure permits, with the device box at 3.7 m (12 ft) AFF or higher Tamper-resistant fastener heads on every conduit support, every box cover, every device cover (Torx with security pin, Tri-wing, or one-way as the project specification calls for) Conduit body covers (LB, T, C, X) prohibited inside the protected space. Junction and pull boxes only with screw-cover and screws inaccessible from the protected side. Caulk and sealant at every conduit penetration: pick-resistant detention-grade sealant per chapter 16. Standard fire-rated caulk is not pick-resistant. Cable serviced from the secure side of the wall. Every device on the prisoner-facing wall fed by conduit running through the secure-side mechanical chase. Box opening and service access on the secure side only. No ceiling-cable or J-hook runs inside the protected space. All cable in conduit, all conduit terminations on the secure side. Anti-ligature considerations: no grab points, no exposed conduit below 3.7 m, double-strap every support, and pick-proof every visible fastener
Field note
// WHAT I USE FOR DETENTION RGS with threaded couplings throughout, Iberville Krydon cast junction boxes on the secure side with stainless cover screws and tamper-resistant Torx heads. Pick-proof sealant per the project’s detention specification (the standard fire caulk is not pick-proof; the manufacturer publishes which products meet the detention-grade rating) Service every device from the secure side; the prisoner-facing wall is smooth, anti-ligature, and unbroken.
// THE PRACTITIONER POSITION The pathway outlives every other layer. Pick conduit by environment, hold to the 5-3-3 support rule, two 90° bends max with a pull box every 30 m, 30% design fill, expansion fittings at every joint, sealing fittings at every interior-to-exterior boundary. The brands in the field notes are what I have used and what holds up; substitute equivalents if your distributor stocks something different, but stay inside the spec on dimensions, ratings, and CSA listings. Do all of that and the cable plant carries the building through four hardware refreshes without a re-pull.